mechanical engineering MCQs – Page 186

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

3701. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if___________________?
0

A. the area is vertical

B. all of the above

C. none of the above

D. the area is inclined

E. the area is horizontal

3702. Piezometer is used to measure_____________________?
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A. difference of pressure between two points

B. very low pressures

C. atmospheric pressure

D. flow

E. pressure in pipe, channels etc.

3703. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be_______________?
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A. 2000 kg

B. 1000 kg

C. 4000 kg

D. 8000 kg

E. 16000 kg

3704. A balloon lifting in air follows the following principle_____________________?
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A. law of gravitation

B. Archimedes principle

C. all of the above

D. principle of buoyancy

E. continuity equation

3705. Cavitation is caused by_____________________?
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A. weak material

B. high pressure

C. low viscosity

D. high velocity

E. low pressure

3706. Two pipe systems can be said to be equivalent, when the following quantities are same__________________?
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A. flow and length

B. friction loss and flow

C. friction factor and diameter

D. length and diameter

E. velocity and diameter

3707. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of__________________?
0

A. 1.2

B. 1

C. 0.75

D. 1.25

E. 0.8

3708. The process of diffusion of one liquid into the other through a semi-permeable membrane is called_______________________?
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A. diffusivity

B. surface tension

C. cohesion

D. viscosity

E. osmosis

3709. The time oscillation of a floating body with increase in metacentric height will be_________________?
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A. same

B. higher

C. lower/higher depending on weight of body

D. lower

E. unpredictable

3710. The flow which neglects changes in a transverse direction is known as_________________?
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A. turbulent flow

B. uniform flow

C. one dimensional flow

D. streamline flow

E. steady flow

3711. In a forced vortex, the velocity of flow everywhere within the fluid is__________________?
0

A. unpredictable

B. non-zero finite

C. minimum

D. maximum

E. zero

3712. The normal stress is same in all directions at a point in a fluid_______________?
0

A. irrespective of the motion of one fluid layer relative to an adjacent layer

B. when there is no motion of one fluid layer relative to an adjacent layer

C. only when the fluid is frictionless

D. in case of an ideal fluid

E. only when the fluid is incompressible and has zero viscosity

3713. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called________________?
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A. viscosity

B. adhesion

C. cohesion

D. compressibility

E. surface tension

3714. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is___________________?
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A. 40 x 106 kg/cm2

B. none of the above

C. 40 x 105 kg/cm2

D. 400 kg/cm2

E. 4000 kg/cm2

3715. Eulers dimensionless number relates the following__________________?
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A. viscous force and buoyancy force

B. inertial force and gravity

C. pressure force and viscous force

D. viscous force and inertial force

E. pressure force and inertial force

A. all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity

B. ratio of inertial force to force due to surface tension

C. ratio of inertial force to force due to viscosity

D. ratio of inertial force to force due to gravitation

3717. A large Roynold number is indication of________________?
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A. steady flow

B. highly turbulent flow

C. smooth and streamline flow

D. laminar flow

E. turbulent flow

3718. A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
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A. 4 minutes

B. 4 x (225)3/2 minutes

C. 4 (225)1/3 minutes

D. 900 minutes

E. 4 x V225 minutes

3719. When a body floating in a liquid, is displaced slightly, it oscillates about _________________?
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A. center of buoyancy

B. center of pressure

C. liquid surface

D. e.g. of body

E. metacentre

3720. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will_________________?
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A. increase/decrease depending on depth of immersion

B. remain same

C. decrease

D. unpredictable

E. increase

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