mechanical engineering MCQs – Page 103

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 Review each marked answer and report any item that may be outdated or unclear.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

2041. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?
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A. none of the above

B. remain dry satruated

C. dry

D. wet

E. superheated

2042. During the opening of a valve in a pipe line, the flow is_________________?
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A. laminar

B. steady

C. free vortex type

D. unsteady

E. uniform

2043. Maximum energy loss in a boiler occurs due to _______________________?
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A. incomplete combustion

B. ash content

C. radiation losses

D. flue gases

E. unburnt carbon in ash

2044. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_________________?
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A. more than the weight of the body

B. weight of the fluid displaced by the body

C. weight of body plus the weight of the fluid displaced hy the body

D. the weight of the body

E. less than the weight of the body

2045. The increase in pressure _________________?
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A. none of the above

B. raises the boiling point of a liquid

C. reduces its volume

D. lowers the boiling point of a liquid

E. .does not affect the boiling point of a liquid

2046. For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is___________________?
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A. 8/3kg

B. 16/3 kg

C. 4/3kg

D. 1 kg

E. 2 kg

2047. It is required to produce large amount of steam at low pressure. Which boiler should be used ?
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A. lancashire boiler

B. pulverised fuel fired boiler

C. cochran boiler

D. stoker fired boiler

E. babcock and wilcox boiler

2048. 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

2049. The ratio of heat utilised to produce steam and the heat liberated in furnace is known as___________________?
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A. boiler efficiency

B. factor of evaporation

C. boiler effectiveness

D. boiler evaporative capacity

E. equivalent evaporation

2050. Heating wet steam at constant temperature is heating it at constant_________________?
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A. entropy

B. volume

C. enthalpy

D. none of the above

E. pressure

2051. The economizer is used in boilers to _______________________?
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A. extract heat from the exhaust flue gases

B. to heat feed water by bled steam

C. economise on fuel

D. increase flue gas temperature

E. increase thermal efficiency of boiler

2052. Lancashire boiler is a__________________?
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A. stationary water tube boiler

B. water tube boiler with natural/forced circulation

C. stationary fire tube boiler

D. none of the above

E. mobile fire tube boiler

2053. Steam in water tube boiler as compared to fire tube boiler_________________?
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A. is raised at same rate

B. could be raised at fast/slow rate depending on design

C. none of the above is true

D. can be raised rapidly

E. is raisd at slower rate

2054. Gradually varied flow is__________________?
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A. steady non-uniform

B. steady uniform

C. non-steady non-uniform

D. true one-dimensional

E. non-steady uniform

2055. The fire tubes in, a Coarran and Scotish marine boiler are_________________?
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A. horizontal

B. vertical

C. inclined

D. both horizontal and vertical

E. horizontal and inclined

2056. The continuity equation is connected with__________________?
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A. conservation of mass

B. open channel/pipe flow

C. viscous/unviscous fluids

D. compressibility of fluids

E. steady/unsteady flow

2057. The number of flue tubes in Lancashire boiler is_________________?
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A. zero

B. four

C. one

D. many

E. two

2058. Locomotive type boiler is__________________?
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A. water wall enclosed furnace type

B. vertical tubular fire tube type

C. horizontal multi-tubular fire tube type

D. horizontal multitubular water tube boiler

E. none of the above types

2059. Fire tube boilers are limited to a maximum design working pressure of ____________________?
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A. 1 kg/cm

B. 6 kg/cm

C. 250 kg/cm2

D. 100 kg/cm2

E. 17 kg/cm2

2060. In an immersed body, centre of pressure is __________________?
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A. below be centre of gravity

B. at the centre of gravity

C. could be above or below e.g. depending on density of body and liquid

D. above the centre of gravity

E. unpredictable

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