mechanical engineering MCQs – Page 36

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 Review each marked answer and report any item that may be outdated or unclear.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

701. Strain is defined as the ratio of__________________?
0

A. change in volume to original volume

B. none of the above

C. any one of the above

D. change in length to original length

E. change in cross-sectional area to original cross-sectional area

702. A circular bar moving in a round hole is an example of_______________?
0

A. incompletely constrained motion

B. none of the above

C. successfully constrained motion

D. completely constrained motion

E. partially constrained motion

703. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?
0

A. less

B. same

C. more or less depending on ambient conditions

D. unpredictable

E. more

704. Presence of moisture in a refrigerant affects the working of___________________?
0

A. condenser

B. compressor

C. evaparator

D. expansion valve

E. heat transfer

705. The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be________________?
0

A. none of the above

B. cor, 0

C. 0, and less than coV

D. 0, 0

E. 0, and more than co2r

706. The value of shear stress which is induced in the shaft due to the applied couple varies____________________?
0

A. from zero at the center to maximum at the circumference

B. none of the above

C. from minimum at the centro to maxi-mum at the circumference

D. from maximum at the center to mini-mum at the cricumference

E. from maximum at the center to zero at the circumference

707. Highest pressure encountered in a refrigeration system should be________________?
0

A. near critical pressure

B. there is no such restriction

C. critical pressure of refrigerant

D. much above critical pressure

E. much below critical pressure

708. Which of the following is the example of lever of first order__________________?
0

A. none of the above

B. pair of clinical tongs

C. arm of man

D. pair of scissors

E. all of the above

709. The COP of a domestic refrigerator___________________?
0

A. is equal to 1

B. is more than 1

C. is less than 1

D. depends upon the weather conditions

E. depends upon the make

710. In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed_______________?
0

A. none of the above

B. Pickering governor

C. Inertia governor

D. Wilson Hartnell governor

E. Hartung governor

711. In actual machines_____________________?
0

A. mechanical advantage is greater than velocity ratio

B. mechanical advantage is equal to velocity ratio

C. none of the above

D. mechanical advantage is unity

E. mechanical advantage is less than velocity ratio

712. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of___________________?
0

A. 3r/8

B. r/%

C. r/A

D. r/2

E. 0.134 r

713. The torsional rigidity of a shaft is expressed by the_______________?
0

A. number of cycles it undergoes before failure

B. maximum torque it can transmit

C. torque required to produce a twist of one radian per unit length of shaft

D. maximum power it can transmit at highest possible-speed

E. elastic limit up to which it resists torsion, shear and bending stresses

714. Sense of tangential acceleration of a link_________________?
0

A. none of the above

B. is same as that of velocity

C. could be either same or opposite to velocity

D. is opposite to that of velocity

E. is perpendicular to that of velocity

715. Percentage reduction of area in performing tensile test on cast iron may be of the order of__________________?
0

A. 15%

B. 50%

C. 0%

D. 60%.

E. 25%

716. Automobile steering gear is an example of____________________?
0

A. turning pair

B. lower pair

C. rotary pair

D. sliding pair

E. higher pair

717. The C.G. of a plane lamina will not be at its geometrical centre in the case of a __________________?
0

A. square

B. rectangle

C. right angled triangle

D. equilateral triangle

E. circle

718. In multi-V-belt transmission, if one of the belt is broken, we have to change the_________________?
0

A. broken belt

B. broken belt and its adjacent belts

C. all the weak belts

D. there is no need of changing any one as remaining belts can take care of transmission of load

E. all the belts

719. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is_________________?
0

A. equal

B. bigger

C. smaller/bigger depending on capacity

D. unpredictable

E. smaller

720. The stress necessary to initiate yielding is_________________?
0

A. lesser than that necessary to stop it

B. considerably lesser than that necessary to continue it

C. greater than that necessary to stop it

D. equal to that necessary to stop it

E. considerably greater than that necessary to continue it

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