(Papers) SSC Junior Engineer Exam Paper - 2018 "held on 23 Jan 2018" Afternoon Shift
(General Engineering Civil, Electrical, Mechanical)

QID : 901 - The S.I unit of electrical energy is ___________.

1) Watt
2) Volts
3) Ampere
4) Joule

Correct Answer: Joule

QID : 902 - Which one of the following is the CORRECT expression for the heat generated in a conductor?

1)1) NX
2) RNX
3) X/N
4) N2X

Correct Answer: X/N

QID : 903 - Which one of the following statement is TRUE?

1) The equivalent resistance in series combination is larger than the largest resistance in the combination.
2) The equivalent resistance in series combination is smaller than the largest resistance in the combination.
3) The equivalent resistance in series combination is equal to the smallest resistance in the combination.
4) The equivalent resistance in series combination is equal to the largest resistance in the combination.

Correct Answer: The equivalent resistance in series combination is larger than the largest resistance in the combination.

QID : 904 - The resistivity of a conductor depends upon ________.

1) pressure
2) temperature
3) degree of illumination
4) shape of cross-section

Correct Answer: temperature

QID : 905 - Determine the energy (in J) stored by a 0.4 H inductance, if the current flowing through it is 2 A.

1) 1.6
2) 0.8
3) 0.4
4) 1.4

Correct Answer: 0.8

QID : 906 - What will be the voltage (in V) across a 8 H inductor, when the rate of change of current in the inductor is 0.5 A/sec.

1) 2
2) 6
3) 4
4) 8

Correct Answer: 4

QID : 907 - What will the equivalent capacitance (in mF) of three capacitors connected in a series having capacitance of 0.04 mF, 0.08 mF and 0.02 mF respectively?

1) 0.026
2) 0.032
3) 0.065
4) 0.011

Correct Answer: 0.011

QID : 908 - Determine the voltage (in V) of a battery connected to a parallel plate capacitor (filled with air) when the area of the plate is 10 square centimetres, the separation between the plates is 5 mm and the charged stored on the plates is 20 pC.

1) 12.3
2) 10.3
3) 11.3
4) 14.3

Correct Answer: 11.3

QID : 909 -

1) 2
2) 1
3) 4
4) 3

Correct Answer: 1

QID : 910 -

1) 80
2) 40
3) 60
4) 30

Correct Answer: 80

QID : 911 - Which one of the following statement is TRUE?

1) Kirchhoff’s law is not applicable to circuits with passive elements.
2) Kirchhoff’s law is not applicable to circuits with lumped parameters.
3) Kirchhoff’s law is not applicable to circuits with non-linear resistances.
4) Kirchhoff’s law is not applicable to circuits with distributed elements.

Correct Answer: Kirchhoff’s law is not applicable to circuits with distributed elements.

QID : 912 - Which one of the following is a passive element to an electrical circuit?

1) Current source
2) Voltage source
3) Resistor
4) Battery

Correct Answer: Resistor

QID : 913 - Which one of the following is the mathematical expression of Ohm’s law?

1) V = I
2) V = R / I
3) V = I - R
4) V = IR

Correct Answer: V = IR

QID : 914 - Determine the current (in A) that flows through a 15 ohms resistance, when the potential difference between the terminals of the resistor is 60 V.

1) 3
2) 4
3) 2
4) 6

Correct Answer: 4

QID : 915 -

1) 8.4
2) 9.6
3) 7.5
4) 6.5

Correct Answer: 7.5

QID : 916 -

1) 3
2) 2
3) 4
4) 6

Correct Answer: 3

QID : 917 - Determine the power (in W) dissipated by a 16 ohms resistor, when the potential difference between the ends of the resistor is 32 V.

1) 66
2) 68
3) 62
4) 64

Correct Answer: 64

QID : 918 -

1) 5
2) 10
3) 15
4) 20

Correct Answer: 10

QID : 919 -

Options:
1) 0.33
2) 0.85
3) 1.21
4) 2.54

Correct Answer: 1.21

QID : 920 -

1) 0.79
2) 0.43
3) 0.45
4) 0.64

Correct Answer: 0.79

QID : 921 - Which one of the following is the S.I. unit of magnetic field strength?

1) Weber
2) Tesla
3) Ampere-meter
4) Ampere/meter

Correct Answer: Ampere/meter

QID : 922 - Which one of the following is the CORRECT expression for magnetic susceptibility?

1)

2)

3)

4)

Correct Answer:

QID : 923 - Which one of the following is the CORRECT value of magnetic permeability in free space?

1)

2)

3)

4)

Correct Answer:

QID : 924 - If the magnetic susceptibility of any material is less than zero then the material is ___________.

1) paramagnetic
2) ferromagnetic
3) diamagnetic
4) ferrimagnetic

Correct Answer: diamagnetic

QID : 925 - Determine the reluctance (in Amp-turns/Wb) of a coil, when the flux through the coil is 15 Wb and the produced mmf is 30 Amp-turns.

1) 4
2) 2
3) 1
4) 3

Correct Answer: 2

QID : 926 - Determine the value of produced mmf (in Amp-turns) in a coil, if the coil has 120 turns and carrying a current of 0.1 A.

1) 12
2) 14
3) 16
4) 18

Correct Answer: 12

QID : 927 -

1) 1240
2) 1265
3) 1260
4) 1230\

Correct Answer: 1230

QID : 928 - Determine the magnitude of EMF (in V) induced between the axis of rotation and the rim of the disc, when the disc of radius 10 cm rotates with an angular velocity of 60 revolutions per second and placed in a magnetic field of 3 T acting parallel to the rotation of the disc.

1) 6.69
2) 4.64
3) 6.67
4) 5.65

Correct Answer: 5.65

QID : 929 - What will be the value of current (in A) in a 50 cm long air-core solenoid, if the value of magnetic field at the center of the solenoid is 5 mT and the solenoid has 300 turns?

1) 6.63
2) 5.63
3) 4.36
4) 8.25

Correct Answer: 6.63

QID : 930 - Determine the maximum flux density (in T) of a material having eddy current coefficient of 2, thickness of 4 mm, volume of 20 cu. meter, which is supplied by a frequency of 50 Hz when the material has eddy current loss of 6 W.

1) 2.24
2) 3.34
3) 1.94
4) 1.21

Correct Answer: 1.94

QID : 931 -

1) 0
2) 12.74
3) 14.14
4) 18.02

Correct Answer: 14.14

QID : 932 - What is the peak-to-peak value of a sinusoidal voltage (in V) having average value of 100 V?

1) 141.44
2) 159.98
3) 282.88
4) 313.97

Correct Answer: 313.97

QID : 933 -

1) 30
2) 56.94
3) 75.68
4) 88.42

Correct Answer: 88.42

QID : 934 -

1) 0
2) 1
3) 2
4) 4

Correct Answer: 2

QID : 935 - Calculate the phase angle between the voltage and current phasor of a series RL circuit having resistance of 65 Ohms and inductive reactance of 37.53 Ohms when supplied by a frequency of 60 Hz.

1) 15
2) 30
3) 45
4) 60

Correct Answer: 30

QID : 936 - Calculate the value of resonant frequency (in kHz) of a tank circuit having capacitance of 0.01 mF and inductance of 0.01 mH?

1) 0.1591
2) 1.591
3) 15.91
4) 159.1

Correct Answer: 15.91

QID : 937 - Calculate the induced emf (in V) in the inductor of a series RL circuit having inductance of 1.8 H and resistance of 90 Ohms after 20 milli-seconds, when supplied by a 20 V DC source.

1) 7.36
2) 10.03
3) 14.76
4) 20

Correct Answer: 7.36

QID : 938 - A delta connected 3-phase circuit has three equal resistances of 36 Ohms in each phase. What is the value of per phase resistance (in Ohms) of the equivalent star connected circuit?

1) 12
2) 36
3) 84
4) 108

Correct Answer: 12

QID : 939 - Calculate the power factor of an AC circuit having an impedance of 16 Ohms, if a 4 A current flows through it and its average power consumption is 200 W.

1) 0.68
2) 0.78
3) 0.88
4) 0.98

Correct Answer: 0.78

QID : 940 - Power consumed by a balanced star connected 3-phase load is measured using two-wattmeter method. The phase voltage and phase current in the load is 220 V and 10 A respectively. What will be difference in reading (in W) of the two wattmeter, if the power factor of the system is 0.8 lagging?

1) 2286.3
2) 2861.2
3) 3048.4
4) 3810.5

Correct Answer: 2286.3

QID : 941 - Which of the following is the dimension of capacitance?

1)

2)

3)

4)

Correct Answer:

QID : 942 - A house has 5 fans of 70 W each that operate for 16 hours a day and one washing machine of 2000 W that operates for 1 hour per day in the month of June. What is the energy consumption (in kWh) of the house in the month of June?

1) 228
2) 235.6
3) 350
4) 486.6

Correct Answer: 228

QID : 943 - A PMMC type voltmeter, having a full scale reading of 250 V and an internal resistance of 400 kilo-ohms, is connect with a series resistance of 100 kilo-ohms. Calculate the sensitivity of the voltmeter (in Ohms/Volts).

1) 2400
2) 2000
3) 20000
4) 24000

Correct Answer: 2000

QID : 944 - Determine the percentage voltage error of a potential transformer with the system voltage of 11,000 V and having a turn’s ratio of 104, if the measured secondary voltage is 98 V.

1) 7.35
2) 5.75
3) 6.25
4) 8.84

Correct Answer: 7.35

QID : 945 - A circuit having power factor of 0.8 consumes 40 W. What will be the value of reactive power (in VAR) of the circuit?

1) 20
2) 40
3) 30
4) 10

Correct Answer: 30

QID : 946 - Determine the phase angle (in degrees) of a balanced 3-phase star connected system, if the first and the second wattmeter show readings of 200 W and 1200 W respectively.

1) 51
2) 65
3) 78
4) 84

Correct Answer: 51

QID : 947 - Which one of the following statement is NOT true about PMMC type instruments?

1) PMMC type instruments have uniformly divided scale.
2) These instruments are suitable for both AC and DC currents.
3) Stray magnetic errors are small in these types of instruments.
4) The cost of PMMC instruments is high.

Correct Answer: These instruments are suitable for both AC and DC currents.

QID : 948 - Which one of the following instrument can measure voltage, resistance, and current?

1) Ammeter
2) Voltmeter
3) Multimeter
4) Wattmeter

Correct Answer: Multimeter

QID : 949 - Which one of the following is the CORRECT expression for voltmeter sensitivity of PMMC type instrument?

1)

2)

3)

4)

Correct Answer:

QID : 950 -

1) 70, 60
2) 80, 70
3) 80, 60
4) 60, 80

Correct Answer: 80, 70

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QID : 951 - For a dc machine shunt resistance and armature resistance values are

1) high and high
2) high and low
3) low and low
4) low and high

Correct Answer: high and low

QID : 952 - If the field of a dc shunt motor gets opened while the motor is running, then the

1) motor will become slow.
2) motor will attain dangerously high speed
3) armature current will drop
4) armature will oscillate about original speed as the mean speed

Correct Answer: motor will attain dangerously high speed

QID : 953 - Inter pole winding is connected in

1) series with armature
2) series with main poles
3) parallel with armature
4) parallel with main poles

Correct Answer: series with armature

QID : 954 - In large machines flat copper strips know as

1) windings
2) bushes
3) risers
4) either of these

Correct Answer: risers

QID : 955 - Lap winding is preferred for

1) low current and low voltage
2) high current and high voltage
3) high current and low voltage
4) low current and high voltage

Correct Answer: high current and low voltage

QID : 956 - Scott connections are used for

1) single phase to three phase transformation
2) three phase to single phase transformation
3) three phase to two phase transformation
4) any of the above

Correct Answer: three phase to two phase transformation

QID : 957 - The primary and secondary windings of an Auto transformer are

1) magnetically coupled
2) electrically coupled
3) both magnetically and electrically coupled
4) None of these

Correct Answer: both magnetically and electrically coupled

QID : 958 - A 40KVA transformer has a core loss of 450 W and total loss of 800 W. Find the copper loss for Maximum efficiency.

1) 350 W
2) 800 W
3) 450 W
4) None of these

QID : 959 - The difference between the stator synchronous speed and rotor speeds is called

1) leading speed
2) lagging speed
3) slip speed
4) slow speed

Correct Answer: slip speed

QID : 960 - In three induction motor maximum torque is inversely proportional to the

1) stator voltage
2) speed of rotor
3) rotor reactance
4) decreasing slip speed

Correct Answer: rotor reactance

QID : 961 - A hysteresis motor

1) is not a self-starting motor.
2) is a constant speed motor
3) needs dc excitation
4) can not be run in reverse speed

Correct Answer: is a constant speed motor

QID : 962 - In a hysteresis motor, the rotor must have

1) retentivity
2) resistivity
3) susceptibility
4) None of these

Correct Answer: retentivity

QID : 963 - In a split phase motor

1) the starting winding is connected through a centrifugal switch
2) the running winding is connected through a centrifugal switch
3) both starting and running windings are connected through a centrifugal switch
4) centrifugal switch is used to control supply voltage

Correct Answer: the starting winding is connected through a centrifugal switch

QID : 964 - Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a

1) magnetic relay
2) thermal relay
3) centrifugal switch
4) None of these

Correct Answer: magnetic relay

QID : 965 - The motor used on small lathes is usually

1) universal motor

2) D.C. shunt motor
3) single-phase capacitor run motor
4) 3-phase synchronous motor

Correct Answer: single-phase capacitor run motor

QID : 966 - If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in

1) damage to the starting winding
2) damage to the centrifugal switch
3) overloading of running winding
4) None of these

Correct Answer: damage to the starting winding

QID : 967 - Under no load conditions the current in a transmission line is due to

1) corona effect
2) capacitance of the line
3) back low from earth
4) Spinning reserve

Correct Answer: capacitance of the line

QID : 968 - If a fixed amount of power is to be transmitted over a certain length with fixed power loss, then_____.

1) the weight of the conductor required will be proportional to the voltage
2) the weight of the conductor required will be inversely proportional to the voltage and that of power factor of the load
3) the weight of the conductor required will be inversely proportional to the square of the voltage and that of power factor of the load
4) the weight of the conductor will be proportional to the square of the voltage and directly proportional to the power factor of the load

Correct Answer: the weight of the conductor required will be inversely proportional to the square of the voltage and that of power factor of the load

QID : 969 - Which of the following is a static exciter?

1) DC separately excited generator
2) Amplidyne
3) metadyne
4) Rectifier

Correct Answer: Rectifier

QID : 970 - In cables, the thickness of the layer of insulation on the conductor depends upon

1) current carrying capacity
2) voltage
3) power factor
4) reactive power

Correct Answer: voltage

QID : 971 - In transmission line generally, the wires used are

1) ASCR wires
2) copper wires
3) iron wires
4) aluminium wires

Correct Answer: ASCR wires

QID : 972 - Which one of the material is used to fix the screw on concrete wall and ceiling?

1) Link clips
2) Bushings
3) Saddles
4) Rowl plug

Correct Answer: Rowl plug

QID : 973 - Which type of insulation covering the conductor used for low voltage?\

1) Poly-vinyl Chloride(P.V.C)
2) Paper
3) vulcanised Indian Rubber(V.I.R)
4) Cotton and Silk Insulation

Candidate Answer: vulcanised Indian Rubber(V.I.R)

QID : 974 - Cheapest system of wiring is

1) casing and capping
2) cleat wiring
3) batten wiring
4) conduit wiring

Correct Answer: cleat wiring

QID : 975 - which type of wiring having very long life

1) Conduit wiring
2) casing capping wiring
3) batten wiring
4) cleat wiring

Correct Answer: Conduit wiring

QID : 976 - Bucholz relay is operated by

1) eddy currents
2) gas pressure
3) electromagnetic induction
4) electrostatic induction

Correct Answer: gas pressure

QID : 977 - The main consideration in designing feeders is

1) current carrying capacity
2) voltage drop
3) resistance
4) transmission voltage

Correct Answer: current carrying capacity

QID : 978 - Speed of the ceiling fan is about

1) up to 10 rpm
2) up to 200 rpm
3) up to 450 rpm
4) up to 10000rpm

Correct Answer: up to 450 rpm

QID : 979 - The air preheater in thermal power plant is called as

1) safety device
2) efficiency increasing equipment
3) Starting device
4) Very essential device

Correct Answer: efficiency increasing equipment

QID : 980 - In synchronous motor damper winding is placed at

1) stator
2) rotor
3) both stator and rotor
4) yoke

Correct Answer: rotor

QID : 981 - LED lamp have a general life expectancy of

1) 1000 hrs.
2) 5000 hrs.
3) 15000 hrs.
4) 50000 Hrs.

Correct Answer: 50000 Hrs.

QID : 982 - Cutting plier use for electrical work must have

1) High strength
2) Insulation
3) Not corrode
4) sharp

Correct Answer: Insulation

QID : 983 - The unit of luminous flux is

1) Steradian
2) Candela
3) Lumen
4) Lux

Correct Answer: Lumen

QID : 984 - A zero watt lamp consumes

1) No power
2) About 5 to 7 W power
3) About 15 to 20 W power
4) About 25 to 30 W power

Correct Answer: About 15 to 20 W power

QID : 985 - A DC generator used for AC welding should have_______.

1) Rising characteristics
2) Dropping characteristics
3) Straight characteristics
4) None of these

Correct Answer: Dropping characteristics

QID : 986 - The welding electric circuit is ____

1) Always earthed
2) Never earthed
3) Through cables only
4) None of these

Correct Answer: Always earthed

QID : 987 - Direct resistance heating is used in

1) Electrode boiler
2) Salt-bath furnace
3) Resistance welding
4) All option are correct

Correct Answer: All option are correct

QID : 988 - The main drawback of resistance welding is

1) High initial as well as maintenance cost.
2) Difficult shapes and sections cannot be welded.
3) Only similar metals can be welded.
4) None of these

Correct Answer: High initial as well as maintenance cost.

QID : 989 - The process of adding, impurities to a semiconductor is known as_____.

1) polling
2) intrusion
3) pugging
4) doping

Correct Answer: doping

QID : 990 - In a p-n junction the potential barrier is due to the charges on either side of the junction. These charges are

1) majority carriers
2) minority carriers
3) Both majority as well as minority carriers
4) fixed donor and acceptor ions

Correct Answer: fixed donor and acceptor ions

QID : 991 - The ripple factor is

1) rms value/DC value
2) Peak value/DC value
3) Peak value / rms value
4) rms value / Peak value

Correct Answer: rms value/DC value

QID : 992 - The output resistance (in kΩ) of a common base transistor, circuit is of the order of

1) 1
2) 50
3) 100
4) None of these

Correct Answer: None of these

QID : 993 - For proper operation of a transistor, its collector should have

1) proper forward bias
2) proper reverse bias
3) very small size
4) None of these

Correct Answer: proper reverse bias

QID : 994 - What- is the characteristics of common collector configuration amplifier with respect to the input and output impedance?

1) Low input and high output impedance
2) High input and low output impedance
3) Low input and low output impedance
4) High input and high output impedance

Correct Answer: High input and low output impedance

QID : 995 - The speed of a synchronous motor can be changed by

1) changing the supply voltage
2) changing frequency
3) changing the load
4) changing supply terminals

Correct Answer: changing frequency

QID : 996 - In a synchronous motor running with fixed excitation, when the load is increased two times, its torque angle becomes approximately

1) half
2) twice
3) four times
4) no change

Correct Answer: twice

QID : 997 - A three-phase synchronous motor will have

1) one slip-ring
2) two slip-rings
3) no slip-rings
4) three slip-rings

Correct Answer: two slip-rings

QID : 998 - The maximum speed variation in a synchronous motor is____.

1) zero
2) 2. percent
3) 4 percent
4) 6 percent

Correct Answer: zero

QID : 999 - In a synchronous motor, the damping winding is generally used to

1) provide starting torque only
2) prevent hunting and provide the starting torque
3) reduce the eddy currents
4) reduce noise level

Correct Answer: prevent hunting and provide the starting torque

QID : 1000 - In a synchronous motor which loss varies with load ?

1) Windage loss
2) Bearing friction loss
3) Core loss
4) Copper loss

Correct Answer: Copper loss

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