mechanical engineering MCQs – Page 32

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 Review each marked answer and report any item that may be outdated or unclear.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

621. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to__________________?
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A. Wcos(a + )

B. Wsin(a + )

C. Wtan(a + )

D. Wtan(a-)

E. W (sin a + cos ).

622. Ackermann steering gear consists of_______________?
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A. lower pairs

B. turning pairs

C. sliding pairs

D. rolling pairs

E. higher pairs

623. Accumulators should have adequate volume to store refrigerant charge at least_________________?
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A. 75%

B. 50%

C. 100%

D. 10%

E. 25%

624. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal__________________?
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A. density of metal cant be determined

B. metal is twice as dense as unknown fluid

C. metal is twice as dense as water

D. metal will float in water

E. none of the above

625. Which of the following disciplines provides study of relative motion between the parts of a machine______________?
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A. applied mechanics

B. kinematics

C. theory of machines

D. mechanisms

E. kinetics

626. In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?
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A. condenser and expansion valve

B. none of the above

C. expansion valve and evaporator

D. compressor and evaporator

E. compressor and condenser

627. Rectilinear motion of piston is converted into rotary by_______________?
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A. cross head

B. four bar chain mechanism

C. slider crank

D. connecting rod

E. gudgeon pin

628. Air refrigeration operates on_____________________?
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A. Carnot cycle

B. Erricson cycle

C. Rankine cycle

D. Brayton cycle

E. Reversed Carnot cycle

629. A riveted joint in which the number otrivets decrease from innermost to outer most row is called__________________?
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A. zig-zag riveted joint

B. criss-cross riveted joint

C. none of the above

D. chain riveted joint

E. diamond riveted joint

630. When a ship travels in a sea, which of the effect is more dangerous___________________?
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A. rolling

B. none of the above

C. all of the above

D. steering

E. pitching

631. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is____________________?
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A. half

B. four times

C. eight times

D. twice

E. same

632. Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?
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A. strong solution to weak solution

B. strong solution to ammonia vapour

C. ammonia vapour to strong solution

D. weak solution to strong solution

E. ammonia vapour to weak solution

633. Refrigeration in aeroplanes usually employs the following refrigerant___________________?
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A. none of the above

B. Freon-22

C. Air

D. Freon-11

E. Co2

634. Short horizontal lines on pressure-enthalpy chart show__________________?
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A. constant total heat lines

B. constant entropy lines

C. constant temperature lines

D. constant volume lines

E. constant pressure lines

635. The value of Poissons ratio for cast iron is_________________?
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A. 3 to 4

B. 0.25 to 0.33

C. 0.4 to 0.6

D. 0.1 to 0.2

E. 0.23 to 0.27

636. Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________?
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A. minimum area after fracture

B. average of A. and B.

C. original cross-sectional area

D. none of the above.

E. area at the time of fracture

637. Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?
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A. 0.25

B. 1.25

C. none of the above

D. 0.5

E. 0.8

638. If some links are connected such that motion between them can take place in more than one direction, it is called_______________?
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A. incompletely constrained motion

B. completely constrained motion

C. successfully constrained motion

D. partially constrained motion

E. none of the above

639. Most of the domestic refrigerators work on the following refrigeration system _________________?
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A. carnot cycle

B. vapour absorption

C. dual cycle

D. vapour compression

E. electrolux refrigerator

640. The value of COP in vapour compression cycle is usually__________________?
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A. any one of the above

B. always more than unity

C. none of the above

D. always less than unity

E. equal to unity

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