mechanical engineering MCQs – Page 144

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 Review each marked answer and report any item that may be outdated or unclear.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

2861. Intensive property of a system is one whose value____________________?
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A. depends on the mass of the system, like volume

B. does not depend on the mass of the system, like temperature, pressure, etc

C. remains constant

D. is dependent on the path followed and not on the state

E. is not dependent on the path followed but on the state

2862. The efficiency of Diesei cycle with decrease in cut off_________________?
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A. remains unaffected

B. first decreases and then increases

C. first increases and then decreases

D. increases

E. decreases

2863. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle___________________?
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A. none of the above

B. more

C. equal

D. less

E. depends on other factors

2864. According to Clausis statement of second law of thermodynamics___________________?
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A. all of the above

B. heat cant be transferred from low temperature source to high temperature source

C. heat can be transferred for low temperature to high temperature source by using refrigeration cycle.

D. heat cant be transferred from low temperature to high temperature source without the aid of external energy

E. heat can be transferred from low temperature to high temperature source if COP of process is more than unity

2865. The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will_________________?
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A. decrease

B. increase

C. remain unchanged

D. increase/decrease depending on application

E. unpredictable

2866. For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?
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A. minimum

B. maximum

C. zero

D. infinity

E. there is no such criterion

2867. Water contained in a beaker can be made to boil by passing steam through it__________________?
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A. any pressure

B. at atmospheric pressure

C. not possible

D. at a pressure greater than atmospheric pressure

E. at a pressure below the firuosphejric pressure

2868. Barometric pressure is equal to_____________________?
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A. 1 mm Hg

B. 760 mm Hg

C. 735.6 mm Hg

D. zero mm Hg

E. 100mm Hg

2869. In a free expansion process___________________?
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A. work done is zero

B. heat transfer is zero

C. both A. and B. above

D. work done is zero but heat increases

E. work done is zero but heat decreases

2870. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as_________________?
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A. Diesel cycle

B. Rankine cycle

C. Atkinson cycle

D. Stirling cycle

E. Dual combustion cycle

2871. First law of thermodynamics___________________?
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A. provides relationship between heat, work and internal energy

B. enables to determine change in internal energy of the system

C. does not help to predict whether the system will or not undergo a change

D. all of the above

E. does not enable to determine change in entropy

2872. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?
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A. basic law of thermodynamics

B. second law to thermodynamics

C. claussius statement

D. zeroth low of thermodynamic

E. first law of thermodynamics

2873. Which law states that the specific heat of a gas remains constant at all temperatures and pressures______________________?
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A. there is no such law

B. Joules Law

C. Regnaults Law

D. Boyles Law

E. Charles Law

2874. A perpetual motion machine is___________________?
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A. a non-thermodynamic machine

B. a hypothetical machine whose opera-tion would violate the laws of thermodynamics

C. a thermodynamic machine

D. an inefficient machine

E. a hypothetical machine

2875. Which of the following laws is applicable for the behavior of a perfect gas__________________?
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A. Joules law

B. Gay-Lussac law

C. all of the above

D. Charleslaw

E. Boyles law

2876. In order that a cycle be reversible, following must be satisfied ________________?
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A. when heat is being absorbed, temperature of hot source and working substance should be same

B. when beat is being rejected, temperature of cold source and working sub-stance should be same

C. none of the above

D. free expansion or friction resisted expansion/compression process should not be encountered

E. all of the above

2877. Specific heat of air at constant pressure is equal to___________________?
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A. 1.41

B. 0.21

C. 0.17

D. 0.24

E. 1

2878. One barometric pressure or 1 atmospheric pressure is equal to___________________?
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A. 1.0197 kgf/cm2

B. 1.033 kgf/cm2

C. 0 kgf/cm2

D. 1 kgf/cnr2

E. 100 kgf/cm2

2879. For same compression ratio and for same heat added_________________?
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A. Otto cycle is more efficient than Diesel cycle

B. Diesel cycle is more efficient than Otto cycle

C. efficiency depends on other factors

D. both Otto and Diesel cycles are equally efficient

E. none of the above

2880. Which of the following processes are thermodynamically reversible___________________?
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A. hyperbolic and pV = C

B. constant volume and constant pressure

C. throttling

D. free expansion

E. isothermal and adiabatic

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