mechanical engineering MCQs – Page 99

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 Review each marked answer and report any item that may be outdated or unclear.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

1961. Property of a fluid by which its own molecules are attracted is called___________________?
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A. viscosity

B. surface tension

C. cohesion

D. compressibility

E. adhesion

1962. The specific weight of water is 1000 kg/m_________________?
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A. at mean sea level

B. all the above

C. at normal pressure of 760 mm

D. at 4C temperature

E. none of the above

1963. Which of the following is steam dbal?
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A. brown coal

B. pulverised coal

C. none of the above

D. coking bituminous coal

E. non-coking bituminous coal

1964. One kg of steam sample contains 0.8 kg dry steam; its dryness fraction is__________________?
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A. 0.6

B. 1

C. 0.5

D. 0.8

E. 0.2

1965. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?
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A. may be less or more depending on temperature

B. less

C. more

D. unpredictable

E. equal

1966. A streamline is defined as the line________________?
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A. parallel to outer surface of pipe

B. parallel to central axis flow

C. along which the pressure drop is uniform

D. which occurs in all flows

E. of equal yelocity in a flow

1967. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is _________________?
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A. 0.83

B. 0.4

C. 0.3

D. none of the above

E. 0.6

1968. Free surface of a liquid tends to contract to the smallest possible area due to force of_______________?
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A. viscosity

B. adhesion

C. friction

D. cohesion

E. surface tension

1969. Steam exhaust from high pressure turbine is reheated in _____________________?
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A. boiler drum

B. superheater tubes

C. a separate coil located in convection path

D. a separate coil

E. economiser

1970. Center of pressure compared to e.g. is___________________?
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A. at same point

B. none of the above

C. above or below depending on area of body

D. below it

E. above it

1971. Newtons law of viscosity is a relationship between____________________?
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A. shear stress, velocity and viscosity

B. shear stress and viscosity

C. shear stress, pressure and rate of angular distortion

D. pressure, velocity and viscosity

E. shear stress anctthejiate of angular distortion

1972. Superheating of steam is done at_________________?
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A. constant volume

B. constant pressure

C. constant entropy

D. constant temperature

E. constant enthaply

1973. Secondary air is the used to_________________?
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A. air fed to pulverisers

B. air delivered by induced draft fan

C. transport and dry the coal

D. convert CO (formed in lower zone of furnace) into C02 at higher zone

E. provide air around burners for obtaining optimum combustion

1974. The high pressure boiler is oiie producing steam at a pressure more than_________________?
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A. 5 kg/cm2

B. 75-80 kg/cm2

C. 40 kg/cm2

D. atmospheric pressure

E. 10 kg/cm2

1975. Pressure of the order of 10? torr can be measured by__________________?
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A. McLeod gauge

B. micro-manometer

C. ionisastion gauge

D. Bourdon tube

E. Pirani Gauge

1976. In a throttling process_________________?
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A. all of the above

B. internal energy of steam changes

C. work is done by the expanding steam

D. heat transfer takes place

E. none of the above

1977. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as________________?
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A. streamline flow

B. turbulent flow

C. steady flow

D. uniform flow

E. one dimensional flow

1978. A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
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A. 1:25

B. 01:02.5

C. 1 : 5

D. 1:V5?

E. 1 : 53/2

1979. For combustion of a fuel, following is essential_____________________?
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A. all the three above

B. 02 to support combustion

C. none of the above

D. proper ignition temperature

E. correct fuel air ratio

1980. Choose the wrong statement ?
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A. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

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

C. All floating bodies are stable

D. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy

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

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