mechanical engineering MCQs – Page 50

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 Review each marked answer and report any item that may be outdated or unclear.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

981. On weight basis, air contains following parts of oxygen_________________?
0

A. 21

B. 73

C. 79

D. 25

E. 23

982. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is___________________?
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A. possible, but with lot of sophistications

B. feasible

C. desirable

D. impossible

E. possible

983. Change in enthalpy of a system is the heat supplied at___________________?
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A. N.T.P. condition

B. constant temperature

C. constant volume

D. constant pressure

E. constant entropy

984. Characteristic gas constant of a gas is equal to______________________?
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A. Cv/Cp

B. Cp + Cv

C. Cp x Cv

D. Cp Cv

E. C/Cv

985. Kinematic pairs are those which have___________________?
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A. two elements having Coroilis com-ponent

B. two elements having relative motion

C. minimum of two instantaneous centres

D. all of the above

E. two elements held together mechani-cally

986. The unit of temperature in S.I. units is _________________?
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A. Centigrade

B. Fahrenheit

C. Rankine

D. Kelvin

E. Celsius

987. For the same lift and same angle of ascent, a smaller base circle will give_______________?
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A. something else

B. a small value of pressure angle

C. none of the above is true

D. there is no such relation with pressure angle

E. a large value of pressure angle

988. Angle of descent of cam is defined as the angle__________________?
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A. moved by the cam from beginning of ascent to the termination of descent

B. of rotation of the cam for a definite displacement of the follower

C. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

D. during which the follower returns to its initial position

E. through which the cam rotates during the period in which the follower remains in the highest position

989. If a material fails below its yield point, failure would be due to___________________?
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A. sudden loading

B. straining

C. impact loading

D. creep

E. fatigue

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

B. Stirling cycle

C. Dual combustion cycle

D. Diesel cycle

E. Atkinson cycle

991. 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 heattransferred

C. the end states only

D. the value of index n

E. mass of the system

992. Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?
0

A. 1.27

B. 0.75

C. 1.35

D. 1

E. 2

993. Two systems shall be dynamically equivalent when____________________?
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A. the mass of two are same

B. none of the above

C. e.g. of two coincides

D. all of the above

E. M.I. of two about an axis through e.g. is equal

994. On volume basis, air contains following parts of oxygen _____________________?
0

A. 21

B. 79

C. 23

D. 77

E. 25

995. Rankines theory of failure is applicable for following type of materials___________________?
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A. ductile

B. plastic

C. brittle

D. elastic

E. tough

996. According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as____________________?
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A. volume, if temperature is kept constant

B. temperature

C. remains constant,if volume and temperature are kept constant

D. absolute

E. absolute temperature, if volume is kept constant

997. The pressure angle of a cam depends upon___________________?
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A. angle of ascent

B. offset between centre lines of cam and follower

C. sum of radii of base circle and roller follower

D. lift of follower

E. all of the above

998. Specific heat of air at constant pressure is equal to___________________?
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A. 0.17

B. 0.21

C. 0.24

D. 1

E. 1.41

999. Measurement of temperature is based on_________________?
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A. zeroth law of thermodynamics

B. second law of thermodynamics

C. joules law

D. thermodynamic properties

E. first law of thermodynamics

1000. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?
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A. first law of thermodynamics

B. zeroth low of thermodynamic

C. basic law of thermodynamics

D. second law to thermodynamics

E. claussius statement

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