(Download) BSNL Junior Engineer (JE) Solved Question Paper - 2016
"held on 27 Sep 2016 |  Afternoon shift"

EXAM DATE : 27092016
EXAM NAME : BSNL Online Examination 2016
TOTAL MARKS : 200
EXAM START TIME : 15:00:00
EXAM DURAITON : 03:00:00
TOTAL NO OF QUESTIONS : 200

Question 1.Pick the Synonym for the word "SLUGGISH"

Options:
a) active
b) energetic
c) inactive
d) suspicious

Correct Answer: inactive

Question 2.Which of the phrases (a), (b) and (c) given below should replace the phrase given in bold in the following sentence to make the sentence grammatically meaningful and correct. If the sentence is correct as it is and no correction is required, mark (d) as the answer.

But in the hectic rush of events, both the military and civilian authorities will fail to make effective use of the information they had collected.

Options:

a) was failed in making effective use of
b) failed to make effective use of
c) fails to make effective use of
d) no correction required

Correct Answer: failed to make effective use of

Question 3.Mark the most appropriate substitute to fill the blanks in the given description :

His habits are very similar ______ mine

Options:
a) Of
b) To
c) On
d) With

Correct Answer: To

Question 4.Choose the odd one from given four choices :

Options:

a) Radio
b) Stereo
c) Gramophone
d) Television

Correct Answer: Television

Question 5.Find out the correct spelt word from the choices given :

Options:
a) Obedeint
b) Obedient
c) Obadeint
d) Obedeant

Correct Answer: Obedient

Question 6.Choose the word which is the exact OPPOSITE of the given words:

EXODUS

Options:
a) Influx
b) Homecoming
c) Return
d) Restoration

Correct Answer: Influx

Question 7.Choose the appropriate word in the blank from the given alternatives.

They ___________________ no notice of what people say about them

Options:
a) Make
b) Mind
c) Take
d) Keep

Correct Answer: Take

Question 8.Change the direct narration to indirect narration :

"If you don't keep quiet I shall shoot you", he said to her in a calm voice.

Options:
a) He said calmly that I shall shoot you if you don't be quiet.
b) He warned her calmly that he would shoot her if she didn't keep quiet.
c) Calmly he warned her that be quiet or else he will have to shoot her.
d) He warned her to shoot if she didn't keep quiet calmly.

Correct Answer: He warned her calmly that he would shoot her if she didn't keep quiet.

Question 9.Select one word which is closest in meaning to the statement in the question : Language which is confused and unintelligible

Options:
a) Jargon
b) Idiom
c) Vernacular
d) Vocabulary

Correct Answer: Jargon

Question 10.Four parts of a sentence (P/Q/R/S) are given. Arrange them in the right order to produce a correct sentence : providence had helped me/to retain my true identity and/changed the course of my life/in the process

Options:
a) PSQR
b) PQSR
c) RSQP
d) PRQS

Correct Answer: PQSR

Question 11.What is the name of the job portal brought under the Common Services Centres initiative?

Options:
a) CSC Rozgarsahayata
b) CSC Rozgarduniya
c) CSC Rozgarmitra
d) CSC Rozgarkaryalaya

Correct Answer: CSC Rozgarmitra

Question 12.Moti Masjid in the Red Fort, Delhi was Constructed by

Options:
a) Shershah
b) Shahjahan
c) Aurangzeb
d) Bhahadurshah Zafar

Correct Answer: Aurangzeb

Question 13.Which "Mobile App" has been launched by TRAI to measure Mobile Internet speed

Options:
a) SpeedAxis
b) WhatSpeed
c) MySpeed
d) MobileSpeed

Correct Answer: MySpeed

Question 14.The present ISRO Chairman

Options:
a) G Madhavan Nair
b) K Radhakrishnan
c) AS Kiran Kumar
d) None of these

Correct Answer: AS Kiran Kumar

Question 15.Who has been appointed as President of International Cricket Council (ICC)?

Options:
a) Zaheer Abbas
b) Mustafa Kamal
c) Austin Garden
d) John Sheriff

Correct Answer: Zaheer Abbas

Question 16.What are you doing? The most suitable answer to the question is

Options:
a) I am in dark sleep
b) I am waiting for someone
c) I was in dark sleep
d) None of these

Correct Answer: I am waiting for someone

Question 17.Mahabharta was written by :

Options:
a) Ved Vyas
b) Valmiki
c) Tulsidas
d) None of these

Correct Answer: Ved Vyas

Question 18.Which of the following is cold blooded animal?

Options:
a) man
b) crow
c) lizard
d) tiger

Correct Answer: lizard

Question 19.The longest National Highway in India runs from

Options:
a) Kolkata to Jammu
b) Bhopal to Kanyakumari
c) Ambala to Nagarcoil
d) Varanasi to Kanyakumari

Correct Answer: Varanasi to Kanyakumari

Question 20.Which one of the following is described a the Fourth Estate

Options:
a) Executive
b) Legislature
c) Press
d) Judiciary

Correct Answer: Press

Question 21.Find the Inverse Laplace transform of f(p) = 1 / (p­1)

Options:
a) 1
b) e^at
c) cos at
d) cosh at

Correct Answer: e^at

Question 22.The maximum value of (1/x)^x

Options:
a) e
b) e^1/e
c) (1/e)^e
d) None of these

Correct Answer: e^1/e

Question 23.

Question 24.The equation of the circle whose two diameters are x=2y and 2x+y=0 and radius = 5 is

Options:
a) x² + y²­ 25 = 0
b) x² + y² + 25 = 0
c) x² + y² + 15 = 0
d) ­x²­ y²­ 25 = 0

Correct Answer: x² + y² + 15 = 0

Question 25.

Options:

a) a = 32/17, ­2/17
b) 17/32, 17/2
c) ­17/32, 17/2
d) none

Correct Answer: ­17/32, 17/2

Question 26.

s

Options:
a) cosechx cothx
b) ­ cosechx cothx
c) ­sechx cothx
d) sechx cothx

Correct Answer: ­ cosechx cothx

Question 27.If θ is the angle between Two lines whose slopes are m1 & m2, then Tan θ = _____

Options:
a) m₁­ m₂
b) m₁ + m₂
c) (m₁­ m₂) / (1+ m₁ m₂)
d) (m₁­ m₂) / (1­ m₁ m₂)

Correct Answer: (m₁­ m₂) / (1+ m₁ m₂)

Question 28.Find the midpoint of the segment joining the points (4, ­2) and (­8,6).

Options:
a) (6, 4)
b) (­6,­4)
c) (2, 2)
d) (­2, 2)

Correct Answer: (­2, 2)

Question 29.When proving that a quadrilateral is a trapezoid, it is necessary to show

Options:
a) only one set of parallel sides.
b) one set of parallel sides and one set of non­parallel sides.
c) one set of parallel sides and one set of congruent sides.
d) two sets of parallel sides.

Correct Answer: one set of parallel sides and one set of non­parallel sides.

Question 30.When proving that a quadrilateral is a parallelogram by using slopes, you must find:

Options:
a) the slopes of all four sides.
b) the slopes of two opposite sides.
c) the lengths of all four sides.
d) both the lengths and slopes of all four sides.

Correct Answer: the slopes of all four sides.

Question 31.When proving that a triangle is a right triangle using coordinate geometry methods, you must:

Options:
a) show that the slopes of two of the sides are negative reciprocals creating perpendicular lines and right angles.
b) show that the lengths of the sides satisfy the Pythagorean Theorem, thus creating a right angle.
c) both
d) none

Correct Answer: both

Question 32.If f(x) = 3x², then F(x) =

Options:
a) 6x
b) x³
c) x³ + C
d) 6x + C

Correct Answer: x ³ + C

Question 33.A partial differential equation requires

Options:
a) exactly one independent variable
b) two or more independent variables
c) more than one dependent variable

Correct Answer: two or more independent variables

Question 34.If G is a cyclic group of order 24 and a²⁰⁰²=aⁿ where a ∈ G and 0 < n < 24. Then the value of n is

Options:
a) 4
b) 6
c) 8
d) 10

Correct Answer: 10

Question 35.Let g(x)=ƒ(x)+ƒ(1­x) and ƒ'(x) < 0 for all x ∈ (0,1). Then the interval in which g(x) is increasing is

Options:
a) (1/2,1)
b) 0,1/2
c) (0,1/2) ∪ (1/2,1)
d) none of these

Correct Answer: (1/2,1)

Question 36.The firs iterated kernel of the kernel k(x,t)=e^x+t; a=0,b=1 is given by kernel k(x,t)=e

Options:
a) 2^ex+t
b) (1/2)^ex+t
c) ex+t
d) (e2­ 1)^ex+t

Correct Answer: ex+t

Question 37."Mathematical Expectation of the product of two random variables is equal to the product of their expectations" is true for

Options:
a) any two random variables.
b) if the random variables are independent.
c) if the covariance between the random variables is non zero.
d) if the variance of the random variables are equal.

Correct Answer: if the random variables are independent.

Question 38.Consider the group Z495 under addition modulo 495.

(i) {0,99,198,307,406} is the unique subgroup of Z495 of order 5.
(ii) {0,55,110,165,220,275,330,385,440} is the unique subgroup of Z495 of order 9.
Then,

Options:
a) (i) is true, but (ii) is false
b) (ii) is true, but (i) is false
c) both (i) and (ii) are true
d) both (i) and (ii) are false

Correct Answer: both (i) and (ii) are true

Question 39.A hydrogen atom is excited from n=1 to n=3. What is the value of energy absorbed by the atom ?

Options:
a) 9.06 eV
b) 12.09 eV
c) 13.6 eV
d) 10.2 eV

Correct Answer: 12.09 eV

Question 40.The element with maximum number of its electrons in the valence shell has atomic number

Options:
a) 2
b) 3
c) 9
d) 15

Correct Answer: 2

Question 41.Candela unit according to system international is a

Options:
a) derived unit
b) supplementary unit
c) international unit
d) base unit

Correct Answer: base unit

Question 42.The electronic configuration of "Cr" with atomic number 24 is

Options:
a) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s²
b) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶
c) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s1
d) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s¹ 4p¹

Correct Answer: 1s² 2s² 2p⁶ 3s+ 3p⁶ 3d⁵ 4s¹

Question 43.Which one of the following is not correctly match

Options:
a) kilowatt­hour­energy
b) Celsius­name of a king
c) Balance wheel in watch­invar
d) newton­forces

Correct Answer: Celsius­name of a king

Question 44.These are used for bloodless surgery

Options:
a) Anesthetic
b) Fiber­optics
c) Lasers
d) None

Correct Answer: Lasers

Question 45.which one of the following is not a unit of time

Options:
a) Micro second
b) Second
c) Year
d) Light year

Correct Answer: Light year

Question 46.Boltzman's constant and planck's constant differ in the dimensions of

Options:
a) Time and temperature
b) Mass and temperature
c) Length and mass
d) Length and time

Correct Answer: Time and temperature

Question 47.Visible light's wavelength range ______________.

Options:
a) 0.39 ­ 0.77 mm
b) 0.39 ­ 0.77 μm
c) 0.39 ­ 0.77 nm
d) 0.39 ­ 0.77 cm

Correct Answer: 0.39 ­ 0.77 μm

Question 48.Metals are _______.

Options:
a) Transparent
b) Opaque
c) Translucent
d) None

Correct Answer: Opaque

Question 49.Sky looks blue because the sun light is subjected to __________.

Options:
a) Rayleigh scattering
b) Compton scattering
c) Rayleigh scattering and Compton scattering
d) None

Correct Answer: Rayleigh scattering

Question 50.Soft materials absorb large amount of

Options:
a) heat energy
b) light energy
c) electromagnetic waves
d) sound energy

Correct Answer: sound energy

Question 51.Echo of sound is more prominent if surface is

Options:
a) soft
b) rigid
c) porous
d) smooth

Correct Answer: rigid

Question 52.Ratio of sin(x°) of angle of incidence to sin(x°) of angle of refraction is

Options:
a) Gravitational law
b) Reflection law
c) refraction law
d) Snell's law

Correct Answer: Snell's law

Question 53.Bending of light as it passes from one medium to another is called

Options:
a) reflection
b) diffraction
c) refraction
d) deflection

Correct Answer: refraction

Question 54.Refractive index of a medium is

Options:
a) Speed of light in air to speed of light in vacuum
b) Speed of light in vacuum to speed of light in air
c) focal length to object distance
d) speed of light in the medium x speed of light in the air

Correct Answer: Speed of light in air to speed of light in vacuum

Question 55.Color TV has approximate power of

Options:
a) 100
b) 110
c) 120
d) 130

Correct Answer: 120

Question 56.If a vector gets multiplied by a positive number, then its direction

Options:
a) remain same
b) reversed
c) gets half
d) gets double

Correct Answer: remain same

Question 57.Parameters for a RLC circuit are R= 2 Ω,L= 1 H, C= 1 F . If these are connected in series first and then in parallel, the system response for both the circuits will be ­

Options:
a) underdamped, undamped
b) critically damped, overdamped
c) critically damped, underdamped
d) under damped, critically damped

Correct Answer: critically damped, underdamped

Question 58.An electrolytic capacitor can be used for

Options:
a) DC only
b) AC only
c) Both
d) None

Correct Answer: DC only

Question 59.Find the radius of an isolated sphere capable of being charged to 1 million volt potential before sparking into the air,given that breakdown voltage of air is 3 X 10⁴V/cm

Options:
a) 0.33metre
b) 0.43metre
c) 0.53 metre
d) 0.63 metre

Correct Answer: 0.33metre

Question 60.In an a.c circuit,the ratio of kW/kVA represents

Options:
a) power factor
b) load factor
c) form factor
d) diversity factor

Correct Answer: power factor

Question 61.Gauss's law due to different charge distribution is used to calculate

Options:
a) electric field
b) electric charge
c) electric intensity
d) electric field lines

Correct Answer: electric intensity

Question 62.Relative permeability of vacum is

Options:
a) 4∏x10­7 H/m
b) 1 H/m
c) 1
d) 4∏

Correct Answer: 1

Question 63.The capacitance of a parallel plate capacitor is not influenced by

Options:
a) Thickness of conducting plates
b) Area of the conducting plates
c) Distance separating the plates 幤Āेटोंकेबीच की दूरी
d) Nature of the dielectric between the plates

Correct Answer: Thickness of conducting plates

Question 64.The direction of induced e.m.f. in a conductor (or coil) can be determined by

Options:
a) work law
b) ampere's law
c) fleming's right hand rule
d) fleming's left hand rule

Correct Answer: fleming's left hand rule

Question 65.Electric Field is defined as

Options:
a) Potential per unit Distance
b) Force Per Unit Charge
c) Voltage per unit Current
d) None of These

Correct Answer: Force Per Unit Charge

Question 66.Electric Field is a

Options:
a) Scalar Quantity
b) Vector Quantity
c) Both Scalar Quantity & Vector Quantity
d) None of these

Correct Answer: Vector Quantity

Question 67.Tesla is the unit of

Options:
a) Magnetic Field
b) Magnetic Flux
c) Electric Field
d) Electric Flux

Correct Answer: Magnetic Field

Question 68.Power Factor of an A C circuit lies between

Options:
a) 0 and 1
b) ­1 and 1
c) ­1 and 0
d) none of these

Correct Answer: 0 and 1

Question 69.A solar cell is an example of

Options:
a) photo voltaic cell
b) photo conductive cell
c) photo emissive cell
d) photo radiation cell

Correct Answer: photo voltaic cell

Question 70.

Options:
a) 9V, 12V
b) 4V, 8V
c) 16V, 24V
d) 18V, 36V

Correct Answer: 18V, 36V

Question 71.Two lamps of 100W and 200W rated for 220 V are placed in series and a 440V applied across them, then

Options:
a) only 100W lamp will fuse
b) only 200W lamp will fuse
c) both lamps will fuse
d) no lamp will fuse

Correct Answer: only 200W lamp will fuse

Question 72.The internal resistance of a lead acid cell is mainly due to………..

Options:
a) positive plates
b) negative plates
c) both positive and negative plates
d) electrolyte

Correct Answer: both positive and negative plates

Question 73.Electrons in atoms and molecules can change energy levels by emitting or absorbing

Options:
a) Protons
b) Photons
c) electrons
d) All of these

Correct Answer: Photons

Question 74.when a lead acid cell is recharged

Options:
a) The anode becomes dark chocolate brown colour
b) Voltage rises
c) Energy is absorbed by the cell
d) All of these

Correct Answer: All of these

Question 75.A bipolar junction transistor with forward current transfer ratio α=0.98, when working in CE mode, provides current transfer ration β as

Options:
a) 98
b) 0.02
c) 49
d) 0.49

Correct Answer: 49

Question 76.A Series Series feedback amplifier is

Options:
a) Voltage amplifier
b) Current amplifier
c) Transresistance
d) Transconductance

Correct Answer: Transconductance

Question 77.When a BJT is employed as an amplifier it operates

Options:
a) in cut­off
b) in saturation
c) well into saturation
d) over the active region

Correct Answer: over the active region

Question 78.Electronic distribution of an Si atom

Options:
a) 2,10,2
b) 2,8,4
c) 2,7,5
d) 2,4,8

Correct Answer: 2,8,4

Question 79.Diamagnetic materials are

Options:
a) Attracted by Both poles
b) Attracted by North Pole
c) Repelled by North Pole
d) Repelled by Both Poles

Correct Answer: Repelled by Both Poles

Question 80.Ferromagnet can be demagnatised by

Options:
a) Heating to Curie Temperature
b) Keeping Magnet in Alternating fields
c) Exposure to Cyclic Fields
d) All of these

Correct Answer: All of these

Question 81.Botzmann Constant represents the variation of voltage with

Options:
a) Current
b) Resistance
c) Pressure
d) Temperature

Correct Answer: Pressure

Question 82.The depletion layer in p­n junction is caused by

Options:
a) drift of holes
b) diffusion of charge carriers
c) migration of impurity ions
d) drift of electrons

Correct Answer: diffusion of charge carriers

Question 83.which of the following configuration is used for Emitter follower Amplifier

Options:
a) Common Base
b) Common Emitter
c) Common Collector
d) None

Correct Answer: Common Collector

Question 84.Semiconductors (e.g. germanium, silicon etc.) are those substances whose electrical conductivity lies in between conductors and insulators. In terms of energy band, the valence band is __________ and conduction band is ___________

Options:
a) almost filled, almost empty
b) almost empty, almost filled
c) almost filled, almost filled
d) almost empty, almost empty

Correct Answer: almost filled, almost empty

Question 85.The current gain of amplifier stage is lowest in

Options:
a) CB configuration
b) CE configuration
c) CC configuration
d) same in all configurations

Correct Answer: CB configuration

Question 86.In a negative feedback amplifier, current sampling

Options:
a) tends to decrease the output resistance
b) tends to increase the output resistance
c) does not alter the output resistance
d) produces the same effect on output resistance as voltage sampling

Correct Answer: tends to increase the output resistance

Question 87.A high Q tuned circuit in a tuned amplifier permits it to have high

Options:
a) selectivity
b) fidelity
c) sensitivity
d) frequency range

Correct Answer: selectivity

Question 88.Crystal oscillator uses

Options:
a) silicon crystal
b) germanium crystal
c) crystal diode
d) piezo­electric quartz crystal

Correct Answer: piezo­electric quartz crystal

Question 89.The pulsating dc applied to power amplifier causes

Options:
a) Burning of transistor
b) Hum in the circuit
c) Excessive forward voltage
d) None of these

Correct Answer: Hum in the circuit

Question 90.Power amplifiers generally use transformer coupling because transformer permit

Options:
a) cooling of the circuit
b) Impedance matching
c) distortion­less output
d) good frequency response

Correct Answer: Impedance matching

Question 91.Low efficiency of a power amplifier results in

Options:
a) Low forward bias
b) Less battery consumption
c) More battery consumption
d) none of these

Correct Answer: More battery consumption

Question 92.A semiconductor has generally ________ valance electrons

Options:
a) 2
b) 3
c) 4
d) 6

Correct Answer: 4

Question 93.A 4 bit ripple counter and a bit synchronous counter are made using flip flops having a propagation delay of 10 ns each. If the worst case delay in the ripple counter and the synchronous counter be R and S respectively, then­

Options:
a) R = 10 ns, S = 40 ns
b) R = 40 ns, S = 10 ns
c) R = 10 ns S = 30 ns
d) R = 30 ns, S = 10 ns

Correct Answer: R = 40 ns, S = 10 ns

Question 94.The K­map for a Boolean function is shown in the figure. The number of essential prime implicates for this function is­

Options:
a) 4
b) 5
c) 6
d) 8

Correct Answer: 4

Question 95.AND operation of (79)₁₀ and (­56)₁₀ result in

Options:
a) 50 H
b) 48 H
c) 42 H
d) 08 H

Correct Answer: 48 H

Question 96.Conversion of +1000 decimal number into signed binary word results

Options:
a) 0000 0011 1110 1000
b) 1000 0011 1110 1000
c) 1111 1100 0001 1000
d) 0111 1100 0001 1000

Correct Answer: 1000 0011 1110 1000

Question 97.BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are

Options:
a) a, b, d
b) a, b, c
c) a, b, g, c, d
d) a, b, g, c, d, e, f

Correct Answer: a, b, g, c, d, e, f

Question 98.Which one of the following can be used to change data from special code to temporal code

Options:
a) shift registers
b) counters
c) A/D converters
d) combinational circuits

Correct Answer: shift registers

Question 99.Frequencies in UHF range propagate by means of

Options:
a) ground waves
b) sky waves
c) space waves
d) surface waves

Correct Answer: space waves

Question 100.In a transistor which of the following reason is very lightly doped and is very thin

Options:
a) emitter
b) base
c) collector
d) None of these

Correct Answer: base

Question 101.Which of the following is a passive component?

Options:
a) semiconductor devices
b) vaccum tube devices
c) capacitors
d) All of these

Correct Answer: capacitors

Question 102.An infra­red LED is usually fabricated from LED

Options:
a) Ge
b) Si
c) Ga As
d) Ga As P

Correct Answer: Ga As P

Question 103.The decimal equivalent of (11011101) is

Options:
a) 225
b) 229
c) 221
d) none

Correct Answer: 225

Question 104.Which of the following classes has lowest efficiency ?

Options:
a) class A
b) class B
c) class AB
d) class C

Correct Answer: class A

Question 105.Logic expressions can be simplified by using

Options:
a) Boolean Algebra Method
b) Karnaugh ­ map Method
c) Tabulation Method
d) any of the these

Correct Answer: any of the these

Question 106.Access Time in Memories is equal to

Options:
a) Latency Time
b) Seek Time
c) Transfer Time
d) sum of all these

Correct Answer: sum of all these

Question 107.The universal gate is

Options:
a) NAND gate
b) OR gate
c) AND gate
d) None of these

Correct Answer: NAND gate

Question 108.An AND circuit

Options:
a) is a memory circuit
b) gives an output when all input signals are present simultaneously
c) is a negative OR circuit
d) is a linear circuit

Correct Answer: gives an output when all input signals are present simultaneously

Question 109.Which of the following is not a sequential circuit?

Options:
a) flip­flop
b) counter
c) shift register
d) multiplexer

Correct Answer: multiplexer

Question 110.Most of the memory systems have

Options:
a) electro­pneumatic properties
b) electrostatic properties
c) magnetic properties
d) all of these

Correct Answer: magnetic properties

Question 111.The commercial efficiency of a shunt generator is maximum when its variable loss equals the _____________ loss.

Options:
a) Constant
b) Stray
c) Iron
d) Friction and windage

Correct Answer: Constant

Question 112.Maximum speed of a synchronous machine for 50 Hz is

Options:
a) 1500 rmp
b) 3000 rpm
c) 20000 rpm
d) 30000 rpm

Correct Answer: 3000 rpm

Question 111.The commercial efficiency of a shunt generator is maximum when its variable loss equals the _____________ loss.

Options:
a) Constant
b) Stray
c) Iron
d) Friction and windage

Correct Answer: Constant

Question 112.Maximum speed of a synchronous machine for 50 Hz is

Options:
a) 1500 rmp
b) 3000 rpm
c) 20000 rpm
d) 30000 rpm

Correct Answer: 3000 rpm

Question 113.A balanced star ­connected load of (8+j6)Ω per phase is connected to a balanced 3­phase 400V Supply. Find the power factor

Options:
a) 0.8 lead
b) 0.8 lag
c) 1
d) 0.6 lag

Correct Answer: 0.8 lag

Question 114.The efficiency of d.c machine is maximum when variable losses are equal to

Options:
a) Constant losses
b) zero
c) Half of constant losses
d) Twice constant losses

Correct Answer: Constant losses

Question 115.Thevenin's theorem is________ form of an equivalent circuit

Options:
a) voltage
b) current
c) both voltage and current
d) none of these

Correct Answer: voltage

Question 116.At the time of starting the motor consumes current ____________ than normal

Options:
a) Same
b) High
c) Low
d) None of these

Correct Answer: High

Question 117.Two resisters are said to be connected in series uniquely if ______________

Options:
a) both carry the same value of current
b) anch currents
c) same current passes in turn through both
d) None of these

Correct Answer: same current passes in turn through both

Question 118.The basic requirement of a d.c. armature winding is that it must be _____________

Options:
a) a lap winding
b) a closed one
c) a wave winding
d) either 'a' or 'c'

Correct Answer: a closed one

Question 119.In order to run an induction motor at synchronous speed ______________

Options:
a) load must be reduced
b) friction at bearing must be reduced
c) e.m.f must be injected in the rotor in a phase with rotor e.m.f
d) e.m.f. must be injected in the rotor in a phase opposite to the rotor e.m.f.

Correct Answer: e.m.f must be injected in the rotor in a phase with rotor e.m.f

Question 120."Cogging" in induction motor occurs when __________

Options:
a) number of stator teeth­number of rotor teeth = odd number
b) number of stator teeth­number of rotor teeth = zero
c) number of stator teeth­number of rotor teeth = even number
d) number of stator teeth­number of rotor teeth = negative number

Correct Answer: number of stator teeth­number of rotor teeth = zero

Question 121. In a synchoronous motor with field underexcited, the power factor will be ____________

Options:
a) lagging
b) leading
c) unity
d) none of these

Correct Answer: lagging

Question 122.Which relay is used for protection of feeders ?

Options:
a) MHO relay
b) Translaty relay
c) Merz Price protection
d) Buchholz relay

Correct Answer: Translaty relay

123.The induced e.m.f. in the armature of a lap wound 4­pole d.c. machine having 1000 armature conductors rotating at 600 rpm and with 0.1 wb flux per pole is

Options:
a) 1000 V
b) 100 V
c) 10000 V
d) 10 V

Correct Answer: 10000 V

Question 124.A rectangular waveguide of internal dimensions a=4 cm and b=3 cm is to be operated in TE₁₁ mode. The minimum operating frequency isa

Options:
a) 6.25GHz
b) 12 GHz
c) 3.12 GHz
d) 5 GHz

Correct Answer: 6.25GHz

Question 125.If the carrier of a 100% modulated AM wave is suppressed,the percentage power saving will be

Options:
a) 50
b) 150
c) 100
d) 66.66

Correct Answer: 66.66

Question 126.The basic Data rate of bearer channel in ISDN is

Options:
a) 8 Kbps
b) 16 Kbps
c) 64 Kbps
d) 384 Kbps

Correct Answer: 64 Kbps

Question 127.Which of the following will carry the same information as the AM wave itself ?

Options:
a) SSB
b) VSB
c) DSB
d) All of these

Correct Answer: All of these

Question 128.The disadvantage of FM over AM is that ____________

Options:
a) the noise is very high for high frequency signal
b) high modulating power is required
c) larger bandwidth is required
d) high output power is required

Correct Answer: larger bandwidth is required

Question 129.The input impedance of a line of infinite length is equal to ______________

Options:
a) zero
b) Zo/2
c) Zo
d) Infinity

Correct Answer: Zo

Question 130.Microwave ovens operate at a frequency of __________

Options:
a) 1.37 GHz
b) 2.45 GHz
c) 3.37 GHz
d) 5.52 GHz

Correct Answer: 2.45 GHz

Question 131.Quadrature amplitude modulation is a combination of ______________

Options:
a) PSK & FSK
b) ASK & FSK
c) ASK & ICW
d) ASK & PSK

Correct Answer: ASK & PSK

Question 132.In an amplitude modulated wave, the value of Emax is 10V and Emin is 5V, then percentage of modulation will be

Options:
a) 2%
b) 33.3%
c) 50%
d) 75%

Correct Answer: 2%

Question 133.Typical gain of an amplifier for the UHF channels is

Options:
a) 0 db
b) 2 db
c) ­5 db
d) 40 db

Correct Answer: 2 db

Question 134.Which of the following stages has AGC bias

Options:
a) Local oscillator
b) mixer
c) RF ampliffer
d) AFT discriminator

Correct Answer: mixer

Question 135.If the modulation index of an AM wave is 0.6, the power saved for transmission is ____

Options:
a) 0.94
b) 0.9
c) 0.8
d) 0.5

Correct Answer: 0.5

Question 136.TEM mode in coaxial line has on.

Options:
a) no cut off wave length
b) direct current can't pass
c) a, b are true for TEM mode
d) None of these

Correct Answer: a, b are true for TEM mode

Question 137.The velocity factor of a transmission line depends on ­

Options:
a) Temperature
b) skin effect
c) Relative permittivity of dielectric
d) None of these

Correct Answer: Relative permittivity of dielectric

Question 138.A piece of co­axial cable has a 75 Ω characteristic impedance and a nominal capacitance of 69pF/m. What is the inductance per meter ?

Options:
a) 0.388 H/m
b) 3.88 μH/m
c) 38.8 μH/m
d) 0.388 μH/m

Correct Answer: 0.388 μH/m

Question 139.A parallel plate lossless transmission line consists of brass strips of width w and separated by a distance d . If both w and d are doubled then its characteristic impedance will be ­

Options:
a) halved
b) doubled
c) not change
d) none of these

Correct Answer: not change

Question 140.For transmission line load matching over a range of frequencies, it is best to use a ­

Options:
a) Balun
b) Double stub
c) Broadband directional coupler
d) Single stub

Correct Answer: Double stub

Question 141.Altrenately the characteristic impedance is called

Options:
a) Match Impedance
b) Iterative Impedance
c) Surge Impedance
d) Reflected Impedance

Correct Answer: Surge Impedance

Question 142.Johnson noise is

Options:
a) caused by thermal agitation of free electrons carrying current therefore modulating the current
b) noise carried into a circuit through conductors
c) noise of an electromagnetic origin that is radiated into a ciruit
d) shot noise which results from emission of electrons across a pn junction

Correct Answer: caused by thermal agitation of free electrons carrying current therefore modulating the current

Question 143.PSK and FSK are which type of modulation?

Options:
a) Analog Modulation
b) Digital Modulation
c) Both Analog Modulation & Digital Modulation
d) None of these

Correct Answer: Digital Modulation

Question 144.U interface in ISDN is the interface between

Options:
a) PSTN and Desktop
b) TA and ISDN Phone
c) TA and non ISDN Device
d) TA and PSTN

Correct Answer: TA and PSTN

Question 145.Microwaves propagates through waveguide in

Options:
a) Straight Path
b) Circular Path
c) Zigzag path due to reflection of guide
d) Analog the outer surface of the waveguide

Correct Answer: Zigzag path due to reflection of guide

Question 146.Antennas used in Microwave Communication are

Options:
a) Parabolic antennas
b) Dipole antennas
c) Omni direction Antennas
d) All of these

Correct Answer: Parabolic antennas

Question 147.Standing wave is formed by

Options:
a) Superposition of two waves of Same amplitude
b) Superposition of two waves of Same Frequency
c) Superposition of two waves of Same Phase
d) Superposition of two waves of Same Origing

Correct Answer: Superposition of two waves of Same Frequency

Question 148.Impedance inversion may be obtained with ______________

Options:
a) a short circuited stub
b) an open circuited stub
c) a quarter wave line
d) a half wave line

Correct Answer: a quarter wave line

Question 149.Thevenin's theorem reduces a two terminal network to a

Options:
a) One terminal network
b) current generator in parallel with an impedance
c) Voltage generator in series with an impedance
d) combination of current and voltage generator

Correct Answer: combination of current and voltage generator

Question 150. The wave applied to X plates in a CRO, for obtaining trace of voltage wave, is ­

Options:
a) sawtooth wave
b) sinusoidal wave
c) rectangular wave
d) either (1) or (2)

Correct Answer: sawtooth wave Sawtooth

Question 151. A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage­

Options:
a) lies between 217.56 and 226.44 V
b) lies between 217.4 and 226.6 V
c) lies between 216 and 228 V
d) is exact 222 V

Correct Answer: lies between 216 and 228 V

Question 152.In a CRO which of the following is not a part of electron gun

Options:
a) X­Y Plates
b) Grid
c) Cathode
d) Accelerating anode

Correct Answer: X­Y Plates

Question 153.Without a spectrum analyser, it is not possible to determine

Options:
a) carrier frequency
b) antenna pattern
c) pulse width
d) All of these

Correct Answer: carrier frequency

Question 154.In a distortion factor meter, the filter at the front end is used suppress

Options:
a) odd harmonics
b) even harmonics
c) fundamental component
d) dc component

Correct Answer: fundamental component

Question 155.A 0­200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is

Options:
a) 3%
b) 2%
c) 1.5%
d) .75%

Correct Answer: 1.5%

Question 156.Repeatability and Reproducitibility are related to

Options:
a) Accuracy of the instrument
b) Precision of the instrument
c) Both Accuracy of the instrument & Precision of the instrument
d) None of these

Correct Answer: Precision of the instrument

Question 157.A 0­300 V voltmeter has an error of ± 2% of full scale deflection. What would be the range of reading if true voltage is 30 V?

Options:
a) 24V­36V
b) 29.4V­30.6V
c) 20V­40V
d) none of these

Correct Answer: 24V­36V

Question 158.Air cored inductive transducer are suitable for use ________

Options:
a) at lower frequencies
b) at higher frequencies
c) at equal frequencies
d) as are employed for iron cored transducer

Correct Answer: at higher frequencies

Question 159.A vertical amplifier for a CRO can be desinged for __________

Options:
a) only a high gain
b) only a broad bandwidth
c) a constant gain times bandwidth product
d) all of these

Correct Answer: a constant gain times bandwidth product

Question 160.Spectrum analyzer is designed to represent graphically a plot of ____________

Options:
a) amplitude vs phase
b) phase vs frequency
c) amplitude vs time
d) amplitude vs frequency

Correct Answer: amplitude vs frequency

Question 161.DC probes are generally used with a voltmeter to

Options:
a) Decrease its range
b) Increase its range
c) Frequency independent
d) None of these

Correct Answer: Decrease its range

Question 162.A tangent galvanometer is a

Options:
a) primary instrument
b) indicating instrument
c) absolute instrument
d) secondary instrument

Correct Answer: secondary instrument

Question 163.

Options:
a) stable
b) unstable
c) marginally stable
d) more information is required

Correct Answer: unstable

Question 164. For the signal flow graph shown in fig below the graph determinant Δ is ­

Options:
a) 1­bc­fg­bcfg+cigj
b) 1­bc­fg­cigj+bcfg
c) 1+bc+fg+cigj­bcfg
d) 1+bc+fg+bcfg­cigj

Correct Answer: 1+bc+fg+bcfg­cigj

Question 165. If the characteristic equation of a closed ­ loop system is s²+ 2s + 2 = 0 , then the system is­

Options:
a) overdamped
b) critically damped
c) underdamped
d) undamped

Correct Answer: underdamped

Question 166.In the standard form of closed loop transfer function of second order system is given by C(s)/R(s)= ω²_n /s²+2ςω_ns+ω²_n The damping ratio ς =0, then the system is

Options:
a) undamped system
b) under damped system
c) critically damped system
d) over damped system

Correct Answer: undamped system

Question 167.In the transient response of a second order system, delay time td is the time required for the response to reach the ____________ of the final value

Options:
a) half
b) 1/√2
c) 25%
d) 10%

Correct Answer: half

Question 168.The effect of addition of poles and zeros on phase margin and gain margin can be most conveniently seen in __________

Options:
a) Bode plot
b) Nyquist plot
c) Root locus
d) Routh hurwitz

Correct Answer: Bode plot

Question 169.Which of the following is used for Nyquist plot?

Options:
a) Characteristic equation
b) close loop function
c) either 'a' or 'b'
d) open loop function

Correct Answer: open loop function

Question 170.The best method for determining the stability and transient response is __________

Options:
a) Root locus
b) Nyquist plot
c) Bode plot
d) none of these

Correct Answer: Root locus

Question 171.The electrical capacitance is analog of ___

Options:
a) Fluid flow
b) Thermal resistance
c) Inertia
d) Spring

Correct Answer: Inertia

Question 172.The operational amplifier used in analog computers should have

Options:
a) very high gain
b) very low gain
c) Gain is not important
d) Low input resistance

Correct Answer: very low gain

Question 173.Usually the control system used should have

Options:
a) No damping action
b) Under damping action
c) Critical damping action
d) Over damping action

Correct Answer: No damping action

Question 174.The unity circle of Nyquist plot corresponds to 0 & B line of Bode plot for

Options:
a) Low frequencies
b) High frequencies
c) All of these
d) None of these

Correct Answer: High frequencies

Question 175.Band width is the range of frequencies for which system gain is

Options:
a) Less than 9 db
b) More than 20 db
c) More than ­3 db
d) Less than 10 db

Correct Answer: Less than 10 db

Question 176.An 8085 microprocessor based system uses a 4K X 8 bit RAM whose starting address is AA00_H. The address of the last byte in this RAM is­

Options:
a) OFFFH
b) 1000H
c) B9FFH
d) BA00H

Correct Answer: B9FF_H

Question 177.In the instruction MOV A, M

Options:
a) the content of memory addressed by HL pair is moved to A register
b) The content of A register is moved to memory location addressed by HL pair
c) the 8 bit data is moved to A register
d) none of these

Correct Answer: the content of memory addressed by HL pair is moved to A register

Question 178.The DBMS is divided into

Options:
a) hierarchical mode
b) networking model
c) relational model
d) All of these

Correct Answer: All of these

Question 179.Find the invalid FOR loop structure

Options:
a) FOR I=1 to N DO
b) FOR J=1 TO 10 DO
c) FOR K=1 TO (2*N) DO
d) All of these

Correct Answer: All of these

Question 180.For long distnce communication which of the following data transfer technique is used?

Options:
a) Serial Transfer
b) Parallel Transfer
c) Serial­Parallel transfer
d) Parallel­Serial Transfer

Correct Answer: Serial Transfer

Question 181.system input of the Close loop circuit is output of ______________

Options:
a) Controller after measuring the error
b) Feedback after measuring the output
c) Direct input for desired output
d) All of these

Correct Answer: Controller after measuring the error

Question 182.Which of the following instruction can alter the normal incrementing of the program counter ?

Options:
a) interrrupt
b) call
c) branch
d) all of these

Correct Answer: all of these

Question 183.Which device converts, a decimal input number to binary

Options:
a) accumulator:
b) encoder
c) ALU
d) memory

Correct Answer: ALU

Question 184.In which logic gate, the output is HIGH when all the inputs are LOW?

Options:
a) AND
b) OR
c) NOR
d) NAND

Correct Answer: NOR

Question 185.The word length for computers ranges from

Options:
a) 4 bits to 16 bits
b) 4 bits to 32 bits
c) 4 bits to 12 bits
d) 4 bytes to 32 bytes

Correct Answer: 4 bits to 12 bits

Question 186.There are _____ types of flags in 8086

Options:
a) 8
b) 9
c) 7
d) 4

Correct Answer: 7

Question 187.When the signal on REST IN goes low, which of the following happens in 8085?

Options:
a) The program counter is set to zero
b) The buses are tristated
c) The MPU is reset
d) All of these

Correct Answer: The MPU is reset

Question 188.In 8085, instruction ADD IMMEDIATE to ACCUMULATOR WITH CARRY is represented by the opcode

Options:
a) ADC
b) ACI
c) ADD
d) ADI

Correct Answer: ADD

Question 189.Which among following first generation of MB_Computers had ?

Options:
a) Magnetic Tape and Transistors
b) Integrated Circuits
c) Vaccum Tubes and Magnetic Drum
d) All of these

Correct Answer: Vaccum Tubes and Magnetic Drum

Question 190.The number of bits used to store a BCD digit is:

Options:
a) 8
b) 4
c) 2
d) 1

Correct Answer: 4

Question 191.Man­made noise is caused by

Options:
a) solar eruptions
b) distant stars
c) arc discharge n electrical machine
d) lightining discharges

Correct Answer: arc discharge n electrical machine

Question 192.The maximum power transfer theorem is used in

Options:
a) electronic circuits
b) power system
c) home lighting circuits
d) none of these

Correct Answer: electronic circuits

Question 193.Which of the following is a correct statement ?

Options:
a) Hardware is merely the preparation of printed circuit board for the connection of microprocessor (μP).
b) Software is to provide the required IC chips for μP
c) Hardware is to develp program and to feed into the computer.
d) Software is the impermanent informational structure.

Correct Answer: Software is the impermanent informational structure.

Question 194.A USTART chip provides ______

Options:
a) half duplex operation
b) full duplex operation
c) duplex operation
d) full duplex operation but cannot work in asynchronous mode

Correct Answer: full duplex operation but cannot work in asynchronous mode

Question 195.Floppy disk is

Options:
a) a primary memory
b) cache memory
c) nothing but hard disk
d) used for backup purpose

Correct Answer: nothing but hard disk

Question 196.How many bits are needed to address 64K memory location

Options:
a) 8
b) 10
c) 16
d) 32

Correct Answer: 8

Question 197.which of the following is fastest memory cell?

Options:
a) core memory
b) semiconductor memory
c) bubble memory
d) superconductor memory

Correct Answer: core memory

Question 198.Which of the following are not peripheral devices?

Options:
a) VDU
b) CPU
c) Printer
d) floppy drive

Correct Answer: Printer

Question 199.Dynamic memory is made up of

Options:
a) flip flop
b) MOS transistor gate MOS
c) magnetic core
d) magnetic bubbles

Correct Answer: MOS transistor gate

Question 200.______ is a structured high level language

Options:
a) C
b) fortran
c) Window
d) JAVA

Correct Answer: C
 

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