mechanical engineering MCQs – Page 187

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 Review each marked answer and report any item that may be outdated or unclear.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

3721. A fluid in equilibrium cant sustain____________________?
0

A. tensile stress

B. bending stress

C. shear stress

D. compressive stress

E. all of the above

3722. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm, the pressure at a depth of 50 m below the oil surface will be_________________?
0

A. 3 meters of water column

B. 2 meters of water column

C. 6 meters of water Column

D. 7 meters of water column

E. 5 meters of water column

3723. For a floating body to be in equilibrium_____________________?
0

A. meta centre should be above e.g.

B. none of the above

C. centre of buoyancy and e.g. must lie on same vertical plane

D. all of the above

E. a righting couple should be formed

3724. A perfect gas____________________?
0

A. has constant viscosity

B. has zero viscosity

C. is in compressible

D. is of theoretical interest

E. none of the above

3725. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea__________________?
0

A. Orifice plate

B. pitot tube

C. hot wire anemometer

D. rotameter

E. Venturimeter

3726. For a floating body to be in stable equilibrium, its metacentre should be___________________?
0

A. below the center of buoyancy

B. between e.g. and center of pressure

C. below the center of gravity

D. above the center of buoyancy

E. above the center of gravity

3727. The capillary rise at 20C in a clean glass tube of 1 mm bore containing water is approximately____________________?
0

A. 5 mm

B. 1 mm

C. 20 mm

D. 10 mm

E. 30 mm

3728. Capillary action is due to the_________________?
0

A. surface tension

B. cohesion of the liquid

C. adhesion of the liquid molecules and the molecules on the surface of a solid

D. none of the above

E. all of the above

3729. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are________________?
0

A. less at low temperature and more at high temperature

B. there is no such criterion

C. more

D. equal

E. less

3730. The units of dynamic or absolute viscosity are__________________?
0

A. none of the above

B. metres2 per sec

C. newton-sec per meter

D. newton-sec2 per meter

E. kg sec/meter

3731. The speed of sound in a ideal gas varies directly as its__________________?
0

A. modulus of elasticity

B. density

C. absolute temperature

D. temperature

E. pressure

3732. Operation of McLeod gauge used for low pressure measurement is based on the principle of_________________?
0

A. Pascals law

B. Boyles law

C. Charles law

D. McLeods law

E. gas law

3733. Mach number is significant in_____________________?
0

A. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ships hulls

B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. all of fhe above

D. none of the above

E. supersonics, as with projectiles and jet propulsion

3734. An ideal flow of any fluid must satisfy __________________?
0

A. Pascal law

B. Bernoullis theorem

C. boundary layer theory

D. Newtons law of viscosity

E. continuity equation

3735. Center of pressure on an inclined plane is___________________?
0

A. at metacentre

B. at center of pressure

C. above the centroid

D. below the centroid

E. at the centroid

3736. To avoid an interruption in the flow of a syphon, an air vessel is provided__________________?
0

A. none of the above

B. ay nay point between inlet and outlet

C. at the inlet

D. at the summit

E. at the outlet

3737. Liquids_________________?
0

A. are not viscous

B. occupy definite volume

C. cannot be compressed

D. are not affected by change in pressure and temperature

E. none of the above

3738. Barometer is used to measure__________________?
0

A. very low pressure

B. rain level

C. difference of pressure between two points

D. atmospheric pressure

E. pressure in pipes, channels etc.

3739. The center of pressure of a surface subjected to fluid pressure is the point_______________?
0

A. similar to metacentre

B. where pressure equivalent to hydraulic thrust will act

C. on the surface at which gravitational force acis

D. on the surface at which resultant pres-sure acts

E. at which all hydraulic forces meet

3740. Flow of water in a pipe about 3 metres in diameter can be measured by__________________?
0

A. orifice plate

B. nozzle

C. venturi

D. rotameter

E. pitot tube

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