mechanical engineering MCQs – Page 95

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 Review each marked answer and report any item that may be outdated or unclear.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

1881. The major axis of elliptical manholes on the shell should be provided___________________?
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A. longitudinally

B. circumferentially

C. anywhere

D. on dished end

E. vertically

1882. The difference between cornish boiler and lancashire boiler is that_________________?
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A. none/of the above

B. former is water tube type and latter is fire tube type

C. former is fire tube type and latter is water tube type boiler

D. former contains one fire tube and latter contains two fire tubes

1883. Primary air is the air used to__________________?
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A. convert CO (formed in lower zone of furnace) into C02 at higher zone

B. transport and dry the coal

C. air-delivered by forced draft fan

D. none ot the above

E. provide air around burners for obtaining optimum combustion

1884. Uniform flow occurs when_____________________?
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A. the direction and magnitude of the velocity at all points are identical

B. the magnitude and direction of the velocity do not change from point to point in the fluid

C. velocity, depth, pressure, etc. change from point to point in the fluid flow

D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each pleasure

E. the velocity of successive fluid paiticles, at any point, is the same at successive periods of time

1885. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea__________________?
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A. Venturimeter

B. Orifice plate

C. hot wire anemometer

D. rotameter

E. pitot tube

1886. The change in internal energy in steam engines equals to__________________?
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A. none of the above

B. work done during compression.

C. change in enthalpy

D. work done during adiabatic expansion

E. work done during the rankine cycle ;

1887. Choose the wrong statement?
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A. Center of pressure acts at a greater depth than center of gravity

B. The horizontal component acts through the center of pressure for the vertical projection

C. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

D. he vertical component passes through the center of pressure of the volume

E. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

1888. Steady flow occurs when___________________?
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A. the direction and magnitude of the velocity at all points are identical

B. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

C. velocity, depth, pressure, etc. change from point to point in the fluid flow

D. the velocity of successive fluid particles, at any point, is the same at successive periods of time

E. the magnitude and direction of the velocity do not change from point to point in the fluid

1889. Fusible plug for boilers is made of fusible metal containing tin, lead, and___________________?
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A. aluminium

B. nickel

C. bismuth

D. copper

E. iron

1890. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_________________?
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A. maximum

B. negative value

C. zero

D. minimum

E. could be any value

1891. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is___________________?
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A. could be more or less depending on other factors

B. more

C. same

D. less

E. none of the above

1892. The safety valve at superheater as compared to drum safety valve setting is set at___________________?
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A. any value

B. none of the above

C. higher value

D. same value

E. lower value

1893. In water wall furnace, the heat is transferred to the water-walls by _________________?
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A. radiation and conducton

B. convection

C. conduction

D. radiation and convection

E. radiation

1894. A safety valve in a locomotive starts leaking. The leaking medium will be_________________?
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A. water

B. wet steam

C. dry steam

D. supersaturated steam

E. super heated steam

1895. Bernoulli equation deals with the law of conservation of__________________?
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A. work

B. momentum

C. mass

D. force

E. energy

1896. Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?
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A. uneconomical

B. essential

C. desirable

D. economical

E. optional

1897. The critical pressure at which latent heat of vaporisation is zero is________________?
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A. 1 kgf/cm2

B. 100 kgf/cm2

C. 225.65 kgf/cm2

D. 1 kgf/cm2

E. 273 kgf/cm2

1898. While steam expands in turbines, theoretically the entropy________________?
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A. none of the above

B. behaves unpredictably

C. decreases

D. increases

E. remains constant

1899. The flow in which conditions do not change with time at any point, is known as_________________?
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A. steady flow

B. one dimensional flow

C. streamline flow

D. uniform flow

E. turbulent flow

1900. Efficiency of rankine cycle can be increased by_________________?
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A. decreasing exhaust pressure

B. increasing number of regenerative heaters

C. decreasing initial steam pressure and temperature

D. increasing exhaust pressure

E. increasing the expansion ratio

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