mechanical engineering MCQs – Page 189

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 Review each marked answer and report any item that may be outdated or unclear.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

3761. The vapour pressure over the concave surface is______________________?
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A. equal to the vapour pressure over the plane surface

B. none of the above

C. zero

D. less man the vapour pressure over the plane surface

E. greater than the vapour pressure over the plane surface

3762. Falling drops of water become spheres due to the property of ____________________?
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A. adhesion

B. viscosity

C. compressibility

D. surface tension

E. cohesion

3763. Surface energy per unit area of a surface is numerically equal to _____________________?
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A. atmospheric pressure

B. force of cohesion

C. force of adhesion

D. viscosity

E. surface tension

3764. Practical fluids___________________?
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A. possess none of the above properties

B. are viscous

C. are compressible

D. possess surface tension

E. possess all the above properties

3765. The property of fluid by virtue of which it offers resistance to shear is called________________?
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A. adhesion

B. all of the above

C. surface tension

D. cohesion

E. viscosity

3766. If no resistance is encountered by displacement, such a substance is known as ___________________?
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A. fluid

B. water

C. perfect solid

D. ideal fluid

E. gas

3767. Property of a fluid by which its own molecules are attracted is called___________________?
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A. surface tension

B. compressibility

C. cohesion

D. viscosity

E. adhesion

3768. Select the correct statement?
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A. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

B. Local atmospheric pressure depends upon elevation of locality only

C. Local atmospheric pressure is always below standard atmospheric pressure

D. A barometer reads the difference be-tween local and standard atmospheric pressure

E. Gauge piessure is equal to atmospheric pressure plus instrument reading

3769. Viscosity of water in comparison to mercury is_________________?
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A. higher

B. higher/lower depending on temperature

C. unpredictable

D. lower

E. same

3770. Choose the wrong statement ?
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A. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy

B. If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

C. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

D. All floating bodies are stable

E. The center of buoyancy is located at the center of gravity of the displaced liquid

3771. Choose the correct relationship ?
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A. specific gravity = gravity x density

B. kinematicviscosity = dynamicviscosity x density

C. dynamicviscosity = kinematicviscosity x density

D. gravity = specific gravity x density

E. hydrostaticforce = surface tension x gravity

3772. Fluid is a substance that___________________?
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A. cannot be subjected to shear forces

B. flows

C. cannot remain at rest under action of any shear force

D. always expands until it fills any container

E. has the same shear stress.at a point regardless of its motion

3773. The buoyancy depends on___________________?
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A. mass of liquid displaced

B. none of the above

C. pressure of the liquid displaced

D. viscosity of the liquid

E. depth of immersion

3774. Alcohol is used in manometer, because____________________?
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A. it provides accurate readings

B. it provides suitable meniscus for the inclined tube

C. its vapour pressure is low

D. its density is less

E. it provides longer length for a given pressure difference

3775. The specific weight of water is 1000 kg/m_________________?
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A. none of the above

B. at normal pressure of 760 mm

C. at 4C temperature

D. at mean sea level

E. all the above

3776. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________?
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A. 5.0 above the hydraulic gradient

B. 2.4 m above the hydraulic gradient

C. 10.0 m above the hydraulic gradient

D. none of the above

E. 6.4 m above the hydraulic gradient

3777. When the flow parameters at any given instant remain same at every point, then flow is said to be___________________?
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A. laminar

B. quasi static

C. static

D. steady state

E. uniform

3778. Alcohol is used in manometers because___________________?
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A. it has low surface tension

B. is provides suitable meniscus

C. it is clearly visible

D. it can provide longer column due to low density

E. it has low vapour pressure

3779. The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be ________________?
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A. 4000 kg

B. 500 kg

C. 1500 kg

D. 1000 kg

E. 2000 kg

3780. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of g at this place is _________________?
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A. 9.75 m/sec2

B. 10.2/m sec

C. 9 m/sec

D. 10m/sec2

E. 9.81 m/sec2

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