mechanical engineering MCQs – Page 149

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 Review each marked answer and report any item that may be outdated or unclear.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

2961. Superheated vapour behaves___________________?
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A. approximately as a gas

B. as average of gas and vapour

C. exactly as gas

D. as steam

E. as ordinary vapour

2962. Gases have___________________?
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A. under some conditions one value and sometimes two values of specific heat

B. two values of specific heat

C. three values of specific heat

D. no value of specific heat

E. only one value of specific heat

2963. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is____________________?
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A. multiplied by its specific weight

B. divided by its molecular weight

C. divided by its specific weight

D. multiplied by its molecular weight

E. multiplied by its density

2964. On weight basis, air contains following parts of oxygen_________________?
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A. 21

B. 25

C. 23

D. 73

E. 79

2965. The unit of mass in S.I. units is ____________________?
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A. kilogram

B. tonne

C. gram

D. quintal

E. newton

2966. If value of n is infinitely large in a polytropic process pV = C, then the process is known as constant_____________________?
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A. entropy

B. volume

C. enthalpy

D. temperature

E. pressure

2967. On volume basis, air contains following parts of oxygen _____________________?
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A. 79

B. 21

C. 23

D. 77

E. 25

2968. Entropy change depends on___________________?
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A. mass transfer

B. change of temperature

C. change of pressure and volume

D. thermodynamic state

E. heat transfer

2969. The unit of length in S.I. units is________________?
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A. kilometer

B. meter

C. centimeter

D. millimeter

2970. The unitof universal gas constant is___________________?
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A. erg/K

B. watts/K

C. ergscm/K

D. dynes/C

E. none of the above

2971. The efficiency of a Carnot engine depends on_______________________?
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A. type of fuel fired

B. design of engine

C. working substance

D. size of engine

E. temperatures of source and sink

2972. Diesel cycle consists of following four processes_________________?
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A. two isentropics and two constant pressures

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

C. two isentropics, and two constant volumes.

D. two isothermals and two isentropics

E. none of the above

2973. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?
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A. internal energy

B. enthalpy

C. temperature

D. all of the above

E. entropy

2974. No liquid can exist as liquid at____________________?
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A. in space

B. centre of earth

C. vacuum

D. 273 K

E. zero pressure

2975. If a certain amount of dry ice is mixed with same amount of water at 80C, the final temperature of mixture will be__________________?
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A. 0C

B. 80C

C. 20C

D. 40C

E. 60C

2976. The efficiency of Carnot cycle is maximum for_____________________?
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A. well lubricated engine

B. steam engine

C. gas engine

D. petrol engine

E. reversible engine

2977. Isochoric process is one in which___________________?
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A. free expansion takes place

B. very little mechanical work is done by the system

C. no mechanical work is done by the system

D. mass and energy transfer do not take place

E. all parameters remain constant

2978. Total heat of a substance is also known as __________________?
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A. thermal capacity

B. enthalpy

C. thermal conductance

D. entropy

E. internal energy

2979. Extensive property of a system is one whose value______________________?
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A. is dependent on the path followed and not on the state

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

C. depends on the mass of the system like volume

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

E. is always constant

2980. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227 C and 27 C. His claim is__________________?
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A. may be possible with lot of sophistications

B. theroretically possible

C. cost will be very high

D. not possible

E. justified

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