(Papers) SSC Junior Engineer Exam Paper - 2018 "held on 24 Jan 2018" Morning Shift (Mechanical Engineering)

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(Papers) SSC Junior Engineer Exam Paper - 2018 "held on 24 Jan 2018" Morning Shift (Mechanical Engineering)

 

QID : 501 - What kind of contact can be established for a lower pair?

Options:
1) Point contact
2) Surface contact
3) No contact
4) None of these
Correct Answer: Surface contact
 

QID : 502 - अंतरीक्ष में मुक्त निकाय के लिए कितने घूर्णनी स्वतंत्र कोटि मौजूद है?
Options:
1) 3

2) 4

3) 5

4) 6
Correct Answer: 3
 

QID : 503 - Kinematic chain is known as mechanism when _________.

Options:
1) none of the link is fixed
2) one link is fixed
3) two links are fixed
4) all of the links are fixed
Correct Answer: one link is fixed
 

QID : 504 - Which of the following is TRUE for a flywheel which is retarding, if T is the torque on the crankshaft at any instant and Tmean is the mean resisting torque?

Options:
1) Tmean-T>0

2) T -Tmean >0

3) Tmean-T<0

4) T -Tmean <0
Correct Answer: T -Tmean <0
 

QID : 505 - Which term defines the fluctuation of speed of a flywheel in terms of linear speeds?

Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 506 - 

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Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 507 - Which kind of pair can attachment of a car mirror be classified into?

Options:
1) Rolling pair
2) Sliding pair
3) Spherical pair
4) Screw pair
Correct Answer: Sliding pair
 

QID : 508 - Which of the following can said to be equivalent with the frictional torque transmitted by a cone clutch?

Options:
1) Flat pivot bearing
2) Flat collar bearing
3) Conical pivot bearing
4) Trapezoidal pivot bearing
Correct Answer: Trapezoidal pivot bearing
 

QID : 509 - 

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Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 510 - 

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Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 511 - Which of the following is CORRECT for the train value of a gear train?

Options:
1) Speed of driver/speed of driven
2) Speed of driven/speed of driver
3) Number of teeth on driven/number of teeth on driver
4) None of these
Correct Answer: Speed of driven/speed of driver
 

QID : 512 - What will be the change in the vertical height (in m) of a watt governor, when the speed is decreased from 50 rpm to 25 rpm?

Options:
1) 0.358

2) 1.074

3) 1.432

4) 1.79
Correct Answer: 1.074
 

QID : 513 - How is sensitivity and stability related to governor?

Options:
1) Directly proportional
2) Inversely proportional
3) Not related
4) Cannot be determined
Correct Answer: Inversely proportional
 

QID : 514 - Which ratio defines the height of a watt governor to that of the porter governor for equal arm and link lengths, where m is the mass of the ball and M is the mass of the sleeve?

Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 515 - Which of the following cam follower has the highest wear rate?

Options:
1) Knife edge follower
2) Roller follower
3) Flat face follower
4) Spherical faced follower
Correct Answer: Knife edge follower

Study Material for Junior Engineer (Civil / Electrical / Mechanical Engineering) Examination

Study Kit for SSC CGL EXAM

QID : 516 - When the friction comes into action between the two running parts of a machine, it results in the production of ________.

Options:
1) light
2) oil
3) energy
4) heat
Correct Answer: heat
 

QID : 517 - When the position of the body is either in rest or in uniform velocity, then the body is said to be in the ________.

Options:
1) rest
2) uniform motion
3) rotational motion
4) equilibrium
Correct Answer: equilibrium
 

QID : 518 - The beam which has one ________ end and other ________ end is known as cantilever beam.

Options:
1) fixed, free
2) fixed, hinged
3) hinged, free
4) None of these
Correct Answer: fixed, free
 

QID : 519 - Calculate the value of modulus of rigidity (N/mm2) if the Poisson’s ratio is 0.25 and modulus of elasticity for the material is 200 N/mm2?

Options:
1) 50
2) 80
3) 100
4) 150
Correct Answer: 80
 

QID : 520 - Choose the INCORRECT option for the Hooke’s law.

Options:
1)

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 521 - 

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Options:
1) 234

2) 256

3) 288

4) 300
Correct Answer: 288
 

QID : 522 - The conditions for the thermal stress in a body are given below.
(1) It is the function of coefficient of thermal expansion.
(2) It is the function of temperature rise.
(3) It is the function of modulus of elasticity.

Which of the following is the CORRECT answer?

Options:
1) 1 and 2 only
2) 1 and 3 only
3) 2 and 3 only
4) All option are correct
Correct Answer: All option are correct
 

QID : 523 - If the stress acting on a point is in the three dimensions, then what is the number of components in a stress tensor required for defining that stress?

Options:
1) 3

2) 4

3) 6

4) 9
Correct Answer: 9
 

QID : 524 - If the equivalent torque in a shaft is 500 Nm and the bending moment is 300 Nm. Calculate the magnitude of the required torque and the equivalent bending moment.

Options:
1) 500 Nm and 400 Nm
2) 400 Nm and 400 Nm
3) 400 Nm and 500 Nm
4) 300 Nm and 400 Nm
Correct Answer: 400 Nm and 400 Nm
 

QID : 525 - What will be the change in length (mm) of a steel bar having a square cross section of dimension 40 mm x 40 mm, which is subjected to an axial compressive load of 250 kN. If the length of the bar is 4 m and modulus of elasticity is E = 250 GPa?

Options:
1) 2.5

2) 1.25

3) 2

4) 1.5
Correct Answer: 2.5
 

QID : 526 - Choose the INCORRECT option for the equation of elongation of a uniform rod having length L due to the self weight W.

Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 527 - 

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Options:
1) DE
2) CD
3) BD
4) AE
Correct Answer: BD
 

QID : 528 - 

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Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 529 - 

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Options:
1) 30

2) 40

3) 50

4) 60
Correct Answer: 30
 

QID : 530 - If the diameter of the column is reduced by 30%, then what will be the change in the Euler’s buckling load (in %)?

Options:
1) 25
2) 50
3) 75
4) 100
Correct Answer: 75
 

QID : 531 - What is the value of latent heat of vapourization at critical point?

Options:
1) Zero
2) Greater than zero
3) Less than zero
4) Insufficient data
Correct Answer: Zero
 

QID : 532 - What happens to the specific volume of water when it is heated at 0oC?

Options:
1) Decreases steadily
2) Increases steadily
3) First increases then decreases
4) First decreases then increases
Correct Answer: First decreases then increases
 

QID : 533 - Which of the following is the other name of isentropic process?

Options:
1) a reversible isothermal process
2) a reversible adiabatic process
3) a reversible isobaric process
4) a reversible isochoric process
Correct Answer: a reversible adiabatic process
 

QID : 534 - Which of the following represents an impossible cycle?

Options:
1) 

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2) 

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3) 

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4) None of these
Correct Answer: 

 

QID : 535 - Which of the following is INCORRECT for reversible adiabatic process?

Options:
1) dS=0

2) S is constant.
3) dQ=0

4) Q is not constant.
Correct Answer: Q is not constant.
 

QID : 536 - Which of the following method of fuel ignition is used in diesel engine?

Options:
1) Spark plug
2) Fuel injector
3) Combustion chamber
4) Heat from compressed air
Correct Answer: Heat from compressed air
 

QID : 537 - How self ignition temperature of petrol be compared to that of diesel?

Options:
1) Higher
2) Lower
3) Same
4) Insufficient data
Correct Answer: Higher
 

QID : 538 - Which of the following is TRUE for supercharging?

Options:
1) Supplying higher density of air at intake than the surrounding.
2) Providing forced cool air at intake.
3) Raising exhaust pressure
4) Supplying excess fuel for raising load
Correct Answer: Supplying higher density of air at intake than the surrounding.
 

QID : 539 - Which term best represents the calorific value of gaseous fuel?

Options:
1) kcal
2) kcal/kg
3) kcal/m2
4) kcal/n
Correct Answer: kcal/kg
 

QID : 540 - Which of the substance can be classified as pure substance?

Options:
1) Humid air
2) Soil
3) Sand in water
4) Baking soda
Correct Answer: Baking soda
 

QID : 541 - Which of the following statement is INCORRECT for work output of an ideal Otto cycle?

Options:
1) Decreases with an increase in adiabatic index.
2) Decreases with an increase in compression ratio.
3) Increases with an increase in pressure ratio.
4) Both Decreases with an increase in adiabatic index and Decreases with an increase in compression ratio.
Correct Answer: Both Decreases with an increase in adiabatic index and Decreases with an increase in compression ratio.
 

QID : 542 - A reversible engine, which operates between temperature range of 1200 K and 600 K, rejects 30% of heat to the sink comes under the classification of?

Options:
1) Carnot Engine
2) Petrol engine
3) Diesel engine
4) None of these
Correct Answer: None of these
 

QID : 543 - Which relation clearly depicts the absolute thermodynamic temperature scale?

Options:
1) 

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2) 

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3) 

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4) None of these
Correct Answer: 

 

QID : 544 - At triple point for water, which of the following term is not equal to zero?

Options:
1) Enthalpy
2) Entropy
3) Internal energy
4) None of these
Correct Answer: Enthalpy
 

QID : 545 - What does the term ‘quality’ indicate?

Options:
1) Mass fraction of liquid in a liquid vapour mixture
2) Mass fraction of vapour in a liquid vapour mixture
3) Both Mass fraction of liquid in a liquid vapour mixture and Mass fraction of vapour in a liquid vapour mixture
4) None of these
Correct Answer: Mass fraction of vapour in a liquid vapour mixture
 

QID : 546 - A gas is compressed frictionless from an initial state of y m3 and 1 MPa to a final state of 0.2 m3 and 1 MPa. There is a transfer of 40 kJ of heat from the gas and a drop of 20kJ in internal energy. What is the initial state volume of the gas? 

Options:
1) 0.2
2) 0.22
3) 19.8
4) 20.2
Correct Answer: 0.22
 

QID : 547 - What is the drop in enthalpy (in kJ/kg) for a steam whistle which is perfectly insulated and does not work has an exit velocity of steam at 40 m/sec?

Options:
1) 0.8

2) 8

3) 80

4) 800
Correct Answer: 0.8
 

QID : 548 - Two Carnot engines are connected in a series with working extreme temperatures as 2000 K and 200 K respectively. What is the efficiency of the first Carnot engine (in %)?

Options:
1) 0

2) 50

3) 68

4) 90
Correct Answer: 0
 

QID : 549 - 

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Options:
1) Compressed liquid region
2) Saturated liquid vapour region
3) Solid-liquid region
4) Superheated region
Correct Answer: Saturated liquid vapour region
 

QID : 550 - Which formula is the CORRECT depiction of slope of adiabatic curve?

Options:
1) 

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2) 

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3) 

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4) 

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Correct Answer: 

 

QID : 551 - ______ surface hardening process gives maximum hardness to the surface.

Options:
1) Pack hardening
2) Nitriding
3) Cyaniding
4) Induction hardening
Correct Answer: Nitriding
 

QID : 552 - ______ is not a ceramic material

Options:
1) Glass
2) Bakelite
3) Clay
4) Aluminium oxide
Correct Answer: Bakelite
 

QID : 553 - To which of the following is the proof stress related?

Options:
1) Elongation
2) Necking
3) Yielding
4) Fracture
Correct Answer: Elongation
 

QID : 554 - Mechanical seals are used

Options:
1) to prevent vibrations
2) to prevent leakage
3) to reduce friction
4) to balance the equipment
Correct Answer: to prevent leakage
 

QID : 555 - Noise level in case of an aircraft is

Options:
1) generally less than 100 db
2) generally more than 100 db
3) always more than 100 db
4) in the range of 60-80 db
Correct Answer: always more than 100 db
 

QID : 556 - The tool life of a tool is said to be over if

Options:
1) the tool has failed and a poor surface finish is obtained
2) sudden increase in power and cutting forces takes place and chatter appears in machining
3) overheating and fuming due to friction occurs in addition to dimensional instability
4) All option are correct
Correct Answer: All option are correct
 

QID : 557 - Graphite moulds are generally used for continuous casting method because

Options:
1) the metals wet the mould slightly
2) only a small film of lubricating oil is required
3) they are self-lubricating
4) they are comparatively cheaper
Correct Answer: they are self-lubricating
 

QID : 558 - Ceramic tools are fixed to tool by the following process

Options:
1) soldering
2) brazing
3) welding
4) clamping
Correct Answer: brazing
 

QID : 559 - Gear tooth Vernier is used

Options:
1) to measure the addendum
2) to measure the addendum and dedendum
3) to measure the circular pitch
4) to measure the pitch line thickness of both
Correct Answer: to measure the pitch line thickness of both
 

QID : 560 - 

http://sscportal.in/community/sites/default/files/SSC-JE-LOGO.jpeg 
Options:
1) A only
2) B only
3) C only
4) D only
Correct Answer: D only
 

QID : 561 - The major constituents of a fuel are

Options:
1) carbon, hydrogen and oxygen
2) carbon, hydrogen, oxygen and nitrogen
3) carbon, oxygen, hydrogen, nitrogen, phosphorus and sulphur
4) Carbon and hydrogen
Correct Answer: Carbon and hydrogen
 

QID : 562 - The general gas equation is given as

Options:
1) pv = mT

2) p/V=mT

3) pT =mRT

4) p/V = mRT
Correct Answer: pT =mRT
 

QID : 563 - Molar volume is equal to

Options:
1) 22.41 m3 at NTP
2) 2.241 m3 at NTP
3) 29.27 m3 at NTP
4) 1.03 m3 at NTP
Correct Answer: 22.41 m3 at NTP
 

QID : 564 - Internal combustion engine works on

Options:
1) first law of thermodynamics
2) second law of thermodynamics
3) zeroth law of thermodynamics
4) None of these
Correct Answer: first law of thermodynamics
 

QID : 565 - The first and second laws of thermodynamics help to derive the following properties, respectively.

Options:
1) pressure and temperature
2) temperature and entropy
3) pressure and entropy
4) temperature and enthalpy
Correct Answer: temperature and entropy
 

QID : 566 - Constant volume process is

Options:
1) isopiestic process
2) hyperbolic process
3) isometric process
4) polytropic process
Correct Answer: isometric process
 

QID : 567 - 

http://sscportal.in/community/sites/default/files/SSC-JE-LOGO.jpeg
Options:
1) (a) Only
2) (b) Only
3) (c ) Only
4) (d) Only
Correct Answer: (b) Only
 

QID : 568 - The internal energy of a gas obeying van der Waals, equation (p + a/V2)(V-b)= RT depends on its

Options:
1) temperature
2) temperature and pressure
3) temperature and specific volume
4) pressure and specific volume
Correct Answer: temperature and specific volume
 

QID : 569 - Consider the following properties:
(1) Entropy
(2) Viscosity
(3) Temperature
(4) Specific heat at constant volume
Which of the above properties of a system is/are extensive?

Options:
1) Only 1
2) Only 1 and 2
3) Only 2, 3 and 4
4) Only 1, 2 and 4
Correct Answer: Only 1
 

QID : 570 - In cooling tower, water is cooled by the process of:

Options:
1) condensation
2) fusion
3) evaporation
4) sublimation
Correct Answer: evaporation
 

QID : 571 - While starting the centrifugal pump

Options:
1) delivery valve is kept wide open
2) delivery valve is kept closed
3) inlet valve is kept closed
4) delivery valve is opened slightly
Correct Answer: delivery valve is kept closed
 

QID : 572 - In the centrifugal pump, maximum efficiency is obtained when the blades are

Options:
1) bent backward
2) bent forward
3) straight
4) berit to have aerofoil section
Correct Answer: straight
 

QID : 573 - One dimension flow is one

Options:
1) involving zero transverse components of flow
2) in uniform flow
3) in steady uniform flow
4) None of these
Correct Answer: involving zero transverse components of flow
 

QID : 574 - The hydraulic mean depth for a rectangular section is: Where, b = Width of rectangular section d = Depth of water

Options:
1) bd / (2d+b)

2) bd / (d+b)

3) 2bd / (d+b)

4) bd / 2(d+b)
Correct Answer: bd / (2d+b)
 

QID : 575 - The branch of Engineering Science, which deals with water at rest or in motion is called

Options:
1) hydraulics
2) fluid mechanics
3) applied mechanics
4) kinematics
Correct Answer: hydraulics
 

QID : 576 - Pressure inside a water droplet is given by the relation

Options:
1) ρ=4σ/d

2) ρ=3σ/d

3) ρ=8σ/d

4) ρ=16σ/d
Correct Answer: ρ=4σ/d
 

QID : 577 - Vertical distribution of velocity in an open channel for laminar flow can be assumed as

Options:
1) offer no resistance to change of shape
2) offer resistance to change of shape
3) offer least resistance to compression
4) None of these
Correct Answer: offer least resistance to compression
 

QID : 578 - A manometer is used to measure

Options:
1) velocity of flow in channel
2) atmospheric pressure
3) pressure in pipes
4) None of these
Correct Answer: pressure in pipes
 

QID : 579 - The length of mouthpiece as-compared to diameter is

Options:
1) 5 to 6 times
2) 6 to 8 times
3) 2 to 3 times
4) 1 to 1.5 times
Correct Answer: 2 to 3 times
 

QID : 580 - The lower critical Reynolds number is approximately equal to

Options:
1) 100

2) 200

3) 1000

4) 2000
Correct Answer: 2000
 

QID : 581 - If a thin plate is held normal to the flow, the viscous drag on it is

Options:
1) maximum
2) minimum
3) zero
4) None of these
Correct Answer: zero
 

QID : 582 - The cross section of cippoletti weir is

Options:
1) rectangular
2) triangular
3) trapezoidal
4) None of these
Correct Answer: trapezoidal
 

QID : 583 - When there is no air left blow the nappe, it is known as

Options:
1) free nappe
2) depressed nappe
3) adhering nappe
4) All option are correct
Correct Answer: adhering nappe
 

QID : 584 - In case of reaction turbine

Options:
1) P1 = P2

2) P1 > P2

3) P1 < P2

4) None of these
Correct Answer: P1 > P2
 

QID : 585 - The overall efficiency of Pelton wheel is about

Options:
1) 0.55
2) 0.65
3) 0.85
4) 0.99
Correct Answer: 0.85
 

QID : 586 - 

http://sscportal.in/community/sites/default/files/SSC-JE-LOGO.jpeg
Options:
1) (a)

2) (b)

3) (c )

4) (d)
Correct Answer: (a)
 

QID : 587 - Which one of the statements is correct for a forced vortex?

Options:
1) Turns in an opposite direction to a free vortex
2) Always occurs in conjunction with a free vortex
3) Has the linear velocity directly proportional to the radius
4) Has the linear velocity inversely proportional to the radius
Correct Answer: Has the linear velocity directly proportional to the radius
 

QID : 588 - Why is multi-staging in centrifugal pumps used?

Options:
1) For high flow rate
2) For high head
3) For high speed
4) For high efficiency
Correct Answer: For high head
 

QID : 589 - The overall efficiency of a Pelton turbine is 70%. If the mechanical efficiency is 85%, what is its hydraulic efficiency?

Options:
1) 0.824

2) 0.595

3) 0.723

4) 0.815
Correct Answer: 0.824
 

QID : 590 - Which of the following water turbines does not require a draft tube?

Options:
1) Propeller turbine
2) Pelton Turbine
3) Kaplan turbine
4) Francis turbine
Correct Answer: Pelton Turbine
 

QID : 591 - Which phenomenon will occur when the value at the discharge end of a pipe connected to a reservoir is suddenly closed?

Options:
1) Cavitation
2) Erosion
3) Hammering
4) Surging
Correct Answer: Hammering
 

QID : 592 - The pressure drop for a relatively low Reynolds number flow in a 600 mm, 30 m long pipeline is 70 kPa. What is the wall shear stress?

Options:
1) 0

2) 350 Pa

3) 700 Pa

4) 1400 Pa
Correct Answer: 350 Pa
 

QID : 593 - Uniform flow occurs when

Options:
1) the flow is steady
2) the flow is streamline
3) size and shape of the cross section in a particular length remain constant
4) size and cross section change uniformly along length
Correct Answer: size and shape of the cross section in a particular length remain constant
 

QID : 594 - General energy equation holds for

Options:
1) steady flow
2) turbulent flow
3) laminar flow
4) non-uniform flow
Correct Answer: non-uniform flow
 

QID : 595 - Two pipe systems can be said to be equivalent, when the following quantities are same

Options:
1) friction loss and flow
2) length and diameter
3) flow and length
4) friction factor and diameter
Correct Answer: friction loss and flow
 

QID : 596 - Water, by evaporative cooling, can theoretically be cooled down to:-

Options:
1) atmospheric temperature
2) air’s dry bulb temperature
3) air’s wet bulb temperature 
4) air’s dew point temperature 
Correct Answer: air’s dew point temperature 
 

QID : 597 - Any change in load is adjusted by adjusting following parameter on turbine

Options:
1) net head
2) absolute velocity
3) blade velocity
4) flow
Correct Answer: flow
 

QID : 598 - A turbine pump is basically a centrifugal pump equipped additionally with

Options:
1) adjustable blades
2) backward curved blades
3) vaned diffusion casing
4) inlet guide blades
Correct Answer: vaned diffusion casing
 

QID : 599 - A Pelton wheel is

Options:
1) impulse turbine 
2) radial flow impulse turbine
3) inward flow impulse turbine
4) outward flow impulse turbine
Correct Answer: impulse turbine 
 

QID : 600 - Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

Options:
1) lift and resultant force
2) drag and resultant force
3) lift and tangential force
4) lift and drag
Correct Answer: lift and resultant force

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