mechanical engineering MCQs – Page 47

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 Review each marked answer and report any item that may be outdated or unclear.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

921. The first law of thermodynamics is the law of_________________?
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A. conservation of momentum

B. conservation of temperature

C. conservation of heat

D. conservation of mass

E. conservation of energy

922. In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is _______________?
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A. equal to sum of other two

B. less than sum of other two

C. greater than sum of other two

D. none of the above

E. there is no such relationship

923. Stirling and Ericsson cycles are__________________?
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A. reversible cycles

B. irreversible cycles

C. adiabatic irreversible cycles

D. quasi-static cycles

E. semi-reversible cycles

924. Choose the wrong statement ?
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A. Temperature of medium being cooled must be below that of the evaporator

B. frost on evaporator reduces heat transfer

C. refrigerant is circulated in a refrigeration system to transfer heat

D. All solar thermally operated absorption systems are capable only of intermittent operation

E. Refrigerant leaves the condenser as liquid

925. Solids and liquids have___________________?
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A. no value of specific heat

B. one value under some conditions and two values under other conditions

C. one value of specific heat (ft) two values of specific heat

D. three values of specific heat

926. The fatigue life of a part can be improved by_____________________?
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A. heat treating

B. coating

C. electroplating

D. shot peening

E. polishing

927. According to Avogadros Hypothesis ______________________?
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A. all systems can be regarded as closed systems

B. the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature

C. product of the gas constant and the molecular weight of an ideal gas is constant

D. gases have two values of specific heat

E. the sum of partial pressure of mixture of two gases is sum of the two

928. The maximum value of the pressure angle in case of cam is kept as________________?
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A. 20

B. 25.

C. 10

D. 30

E. 14

929. Absolute zero pressure will occur _____________________?
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A. when molecular momentum of the system becomes zero

B. under vacuum conditions

C. at sea level

D. at the center of the earth

E. at a temperature of 273 K

930. Compressed air coming out from a punctured football___________________?
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A. becomes hotter

B. may become hotter or cooler depend-ing upon the humidity of the surrounding air

C. remains at the same temperature

D. becomes cooler1

E. attains atmospheric temperature

931. Choose the correct statement?
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A. Precooling and subcooling bf refrigerant are same

B. Refrigerant is inside the lubes in case of a direct-expansion chiller

C. If operating temperature of system is low, then refrigerant with low boiling point should be used

D. Superheat and sensible heat of a. refrigerant are same

E. A refrigerant should have low latent heat

932. Which of the following is an irreversible cycle_____________________?
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A. carnot

B. all of the above

C. Stirling

D. none of the above

E. ericsson

933. Diesel cycle consists of following four processes_________________?
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A. none of the above

B. two isentropics and two constant pressures

C. two isentropics, one constant volume and one constant pressure

D. two isentropics, and two constant volumes.

E. two isothermals and two isentropics

934. If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to__________________?
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A. zero

B. any where between zero and infinity

C. pressure x volume

D. #NAME?

E. ve

935. Kleins construction gives a graphica construction for________________?
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A. angular acceleration

B. acceleration polygon

C. velocity polygon

D. slider-crank mechanism

E. four bar chain mechanism

936. The unit of time in S.I. units is__________________?
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A. minute

B. second

C. year.

D. hour

E. day

937. Hart mechanism has________________?
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A. twelve links

B. eight links

C. six links

D. four links

E. five links

938. If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows______________________?
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A. IvHpE

B. WpE/2

C. vVvF

D. vpE

E. none of the above, where E = modulus of elasticity and p = mass density

939. According to Kennedys theorem, if three bodies have plane motions, their instantaneous centers lie on___________________?
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A. a curve

B. two lines

C. a triangle

D. a point

E. a straight line

940. Tangential acceleration direction is_________________?
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A. may be any one of these

B. along the angular velocity

C. none of the above

D. opposite to angular velocity

E. perpendicular to angular velocity

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