mechanical engineering MCQs – Page 46

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 Review each marked answer and report any item that may be outdated or unclear.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

901. Carnot cycle efficiency is maximum when______________?
0

A. initial temperature is 0K

B. final temperature is 0K

C. initial temperature is minimum possible

D. final temperature is 0C

E. difference between initial and final temperature is 0K

902. For simple harmonic motion of the of follower, a cosine curve represents___________________?
0

A. velocity diagram

B. displacement diagram

C. all of the above

D. acceleration diagram

E. none of the above

903. According to Daltons law, the total pres sure of the mixture of gases is equal to________________?
0

A. atmospheric pressure

B. sum of the partial pressures of all

C. average of the partial pressures of all

D. greater of the partial pressures of all

E. sum of the partial pressures of all divided by average molecular weight

904. Kelvin Plancks law deals with___________________?
0

A. conversion of heat into work

B. conservation of work

C. conservation of mass

D. conservation of heat

E. conversion fo work into heat

905. Coaxing is the procedure of increasing__________________?
0

A. metal resistance to corrosion by coating

B. fatigue limit by overstressing the metal by successively increasing loadings

C. metal strength by cycling

D. metal hardness by surface treatment

E. none of the above

906. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test_________________?
0

A. Vicker

B. Brinell

C. Shores sceleroscope

D. Rockwell

E. none of the above

907. In an isothermal process, the internal energy________________?
0

A. first increases and then decreases

B. first decreases and then increases

C. remains constant

D. increases

E. decreases

908. Whitworth quick return mechanism is obtained by inversion of___________________?
0

A. five link mechanism

B. slider crank mechanism

C. kinematic chain

D. roller cam mechanism

E. none of the above

909. The same volume of all gases would represent their____________________?
0

A. specific weights

B. densities

C. specific gravities

D. gas characteristic constants

E. molecular weights

910. Reversed joule cycle is called_________________?
0

A. Rankine cycle

B. Bell Coleman cycle

C. Dual cycle

D. Brayton cycle

E. Carnot cycle

911. Lower pairs are those which have___________________?
0

A. point or line contact between the two elements when in motion

B. surface contact between the two elements when in motion

C. two elements that permit relative motion

D. none of the above

E. elements of pairs not -held together mechanically

912. A kinematic chain requires at least________________________?
0

A. 3 links and 4 turning pairs

B. 4 links and 4 turning pairs

C. 5 links and 4 turning pairs

D. none of the above

E. 2 links and 3 turning pairs

913. Coriolis component acts________________?
0

A. unpredictable

B. somewhere in between above two

C. along sliding surfaces

D. none of the above

E. perpendicular to sliding surfaces

914. In Vickers hardness testing, the pyramid indentor apex is__________________?
0

A. 152

B. 122

C. 40

D. 161.

E. 136

915. Pick up the incorrect statement?
0

A. lithium bromide plant cant operate below 0C

B. concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator

C. a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing

D. weak solution in liquid heat exchanger gives up heat to the strong solution

E. lithium bromide used in vapour absorption cycle is nonvolatile

916. The unit of length in S.I. units is________________?
0

A. kilometer

B. meter

C. millimeter

D. centimeter

917. A diathermic wall is one which____________________?
0

A. prevents thermal interaction

B. permits thermal interaction

C. does not exist

D. discourages thermal interaction

E. encourages thermal interaction

918. In testing a material for endurance strength, it is subjected to_______________________?
0

A. static load

B. dynamic load

C. completely reversed load

D. static as well as dynamic load

E. impact load

919. A perfect gas at 27C is heated at constant pressure till its volume is double. The final temperature is________________?
0

A. 600C

B. 654C

C. 54C

D. 327C

E. 108C

920. In S.H.M., acceleration is proportional to _________________?
0

A. displacement

B. none of the above

C. rate of change of velocity

D. all of the above

E. velocity

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