mechanical engineering MCQs – Page 43

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 Review each marked answer and report any item that may be outdated or unclear.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

841. 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

842. 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. depends on other factors

B. none of the above

C. less

D. more

E. equal

843. The notch angle of the Izod impact test specimen is________________?
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A. 20

B. 30

C. 10

D. 60.

E. 45

844. The unit of power in S.I. units is_______________________?
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A. joule

B. watt

C. erg

D. pascal

E. newton

845. The approximate straight line mechanism is a____________________?
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A. 8 bar linkage

B. 5 bar linkage

C. 3 bar linkage

D. four bar linkage

E. 6 bar linkage

846. Which of the following processes is irreversible process___________________?
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A. isothermal

B. adiabatic

C. throttling

D. none of the above

E. all of the above

847. An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has___________________?
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A. 5 links

B. 4 links

C. none of the above

D. 2 links

E. 3 links

848. Kinematic pairs are those which have__________________?
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A. point or line contact between the two elements when in motion

B. none of the above

C. surface contact between the two ele-ments when in motion

D. two elements that permit relative mo-tion

E. elements of pairs not held together mechanically

849. Stress concentration is caused due to_____________________?
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A. pitting atpoints or areas at which loads on a member are applied

B. all of the above

C. none of the above

D. variation in properties of material from point to point in a member

E. abrupt change of section

850. Plastic flow in ductile materials_____________________?
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A. increases the seriousness of static load-ing stress concentration

B. depends on other considerations

C. lessens the seriousness of static loading stress concentration

D. none of the above

E. has no effect on it

851. Coriolis component of acceleration exists whenever a point moves along a path that has________________?
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A. linear displacement

B. rotational motion

C. none of the above

D. centripetal acceleration

E. tangential acceleration

852. The basis for measuring thermodynamic property of temperature is given by___________________?
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A. second law of thermodynamics

B. Avogadros hypothesis

C. first law of thermodynamics

D. third law of thermodynamics

E. zeroth law of thermodynamics

853. A circle passing through the pitch point with its center at the center of cam axis is known as___________________?
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A. pitch circle

B. outer circle

C. prime circle

D. cam circle

E. base circle

854. The index of compression n tends to reach ratio of specific heats y when____________________?
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A. process is isentropic and specific heat does not change with temperature

B. process is isothermal

C. process is isentropic

D. process is isentropic and specific heat changes with temperature

E. flow is uniform and steady

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

B. thermal conductance

C. enthalpy

D. entropy

E. internal energy

856. Isochoric process is one in which___________________?
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A. very little mechanical work is done by the system

B. mass and energy transfer do not take place

C. all parameters remain constant

D. free expansion takes place

E. no mechanical work is done by the system

857. In order that a cycle be reversible, following must be satisfied ________________?
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A. none of the above

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

C. all of the above

D. when heat is being absorbed, temperature of hot source and working substance should be same

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

858. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to________________?
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A. all of the above

B. static loading

C. completely reversed loading

D. combined static and dynamic loading

E. dynamic loading

859. According to first law of thermodynamics_______________________?
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A. heat flows from hot substance to cold substance

B. heat and work are mutually convertible

C. mass and light are mutually convertible

D. mass and energy are mutually convertible

E. Carnot engine is most efficient

860. The specific heat of air increases with increase in __________________?
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A. temperature

B. pressure

C. both pressure and temperature

D. variation of its constituents

E. air flow

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