mechanical engineering MCQs – Page 150

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 Review each marked answer and report any item that may be outdated or unclear.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

2981. Calorie is a measure of
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A. work

B. thermal capacity

C. entropy

D. specific heat

E. quantity of heat

2982. Which of the following is the property of a system___________________?
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A. enthalpy and entropy

B. pressure and temperature

C. volume and density

D. all of the above

E. internal energy

2983. For which of the following substances, the gas laws can be used with minimum error_________________?
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A. wet steam

B. dry steam

C. saturated steam

D. superheated steam

E. steam at atmospheric pressure

2984. In an isothermal process, the internal energy of gas molecules________________?
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A. decreases

B. increases

C. remains constant

D. may increase/decrease depending on the properties of gas

E. shows unpredictable behaviour

2985. A cycle consisting of two adiabatics and two constant pressure processes is known as___________________?
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A. Stirling cycle

B. Ericsson cycle

C. Atkinson cycle

D. Joule cycle

E. Otto cycle

2986. The more effective way of increasing efficiency of Carnot engine is to____________________?
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A. increase higher temperature

B. keep lower temperature constant

C. increase lower temperature

D. decrease lower temperature

E. decrease higher temperature

2987. Stirling and Ericsson cycles are__________________?
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A. reversible cycles

B. semi-reversible cycles

C. adiabatic irreversible cycles

D. quasi-static cycles

E. irreversible cycles

2988. According to kinetic theory of gases, the absolute zero temperature is attained when___________________?
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A. kinetic energy of the molecules is zero

B. specific heat of gas is zero

C. mass is zero

D. pressure of the gas is zero

E. volume of the gas is zero

2989. Work done in an adiabatic process between a given pair of end states depends on__________________?
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A. particular adiabatic process

B. the value of index n

C. the end states only

D. the value of heattransferred

E. mass of the system

2990. The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?
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A. All J/kmol K

B. 83.14J/kmolK

C. 29.27 J/kmolK

D. 848J/kmolK

E. 735 J/kmol K

2991. Work done in a free expansion process is___________________?
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A. zero

B. #NAME?

C. #NAME?

D. minimum

E. maximum

2992. The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is______________________?
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A. 848kgfm/molK

B. 735 kgfm/molK

C. 8314kgfm/molK

D. 29.27 kgfm/molK

E. 427kgfm/molK

2993. The energy of molecular motion appears as________________?
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A. potential energy

B. heat

C. surface tension

D. increase in pressure

E. friction

2994. Which of the following cycles has maximum efficiency_____________?
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A. Rankine

B. Carnot

C. Brayton

D. Stirling

E. Joule

2995. Kelvin Plancks law deals with___________________?
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A. conservation of mass

B. conversion of heat into work

C. conservation of work

D. conversion fo work into heat

E. conservation of heat

2996. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?
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A. none of the above

B. heat is supplied to water at temperature below the maximum temperature of the cycle

C. carnot cycle cant work with saturated steam

D. a rankine cycle receives heat at two places

E. rankine cycle is hypothetical

2997. The same volume of all gases would represent their____________________?
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A. molecular weights

B. gas characteristic constants

C. densities

D. specific gravities

E. specific weights

2998. The ratio of two specific heats of air is equal to____________________?
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A. 0.17

B. 0.24

C. 1.41

D. 2.71

E. 0.1

2999. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are__________________?
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A. real functions

B. point functions

C. path functions

D. thermodynamic functions

E. cyclic functions

3000. Boyles law i.e. pV = constant is applicable to gases under ___________________?
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A. steady change of pressures

B. only small range of pressures

C. all ranges of pressures

D. atmospheric conditions

E. high range of pressures

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