Mechanical Engineering Test - Random - Online Mechanical Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Marks : 2/20

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Joule is the unit of

force

work

power

velocity

[#]

The strain energy stored in a body, when the load is gradually applied, is (where σ = Stress in the material of the body, V = Volume of the body, and E = Modulus of elasticity of the material)

[#]

The hoop stress in a riveted cylindrical shell of diameter (d), thickness (t) and subjected to an internal pressure (p) is (where η = Efficiency of the riveted joint)

[#]

The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.

equal to

less than

more than

[#]

According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

[#]

The entropy of water at 0°C is assumed to be

-1

[#]

In an impulse turbine

the steam is expanded in nozzles only and there is a pressure drop and heat drop

the steam is expanded both in fixed and moving blades continuously

the steam is expanded in moving blades only

the pressure and temperature of steam remains constant

[#]

Thermal conductivity of air increases with rise in temperature.

Correct

Incorrect

[#]

During sensible cooling,

relative humidity remains constant

wet bulb temperature increases

specific humidity increases

partial pressure of vapour remains constant

[#]

10.

In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

liquid pump

generator

absorber and generator

absorber, generator and liquid pump

[#]

11.

When spring index increases, the value of Wahl's stress factor

increases linearly

decreases linearly

remains same

increases exponentially

[#]

12.

The velocity factor for carefully cut gears operating at velocities upto __________ is equal to 4.5/4.5 + v.

10 m/s

12.5 m/s

15 m/s

20 m/s

[#]

13.

The shafts of larger diameter are usually forged and turned to size in a lathe.

Yes

[#]

14.

When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.

rectangular

square

parallel

[#]

15.

In induction hardening, the depth of hardening is controlled by controlling the voltage.

Correct

Incorrect

[#]

16.

Shock resistance of steel is increased by adding

nickel

chromium

nickel and chromium

sulphur, lead and phosphorus

[#]

17.

The essential constituent of a hardened steel is

pearlite

austenite

martensite

troostite

[#]

18.

The temperature of oxy-hydrogen flame is __________ oxy-acetylene flame.

same as

less than

more than

[#]

19.

In bending operation, the metal takes the shape of a punch.

Yes

[#]

20.

The module is the reciprocal of diametral pitch.

True

False

[#]

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Online Mechanical Engineering Test - Mechanical Engineering Test - Random

Marks : 2/20

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