mechanical engineering MCQs – Page 33

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 Review each marked answer and report any item that may be outdated or unclear.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

641. Which of the following has sliding motion________________?
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A. cross-head

B. crank

C. connecting rod

D. crank pin

E. cross head guide

642. If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to__________________?
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A. D1/D2

B. D2/D1

C. D1

D. D1+D2

E. D1-D2.

643. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?
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A. condensation of the refrigerant vapour

B. none of the above

C. compression of the refrigerant vapour

D. metering of the refrigerant liquid

E. evaporation of the refrigerant liquid

644. The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called___________________?
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A. longitudinal stress

B. yeiled stress

C. hoop stress

D. none of the above

E. ultimate stress

645. A key is subjected to side pressure as well at shearing forces. These pressures are called_________________?
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A. none of the above

B. fatigue stresses

C. crushing stresses

D. bearing stresses

E. resultant stresses

646. Transmission of power from the engine to the rear axle of an automobile is by means of___________________?
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A. bevel gears

B. Hookes joint

C. worm and wheel method

D. crown gear

E. compound gears

647. The value of Poissons ratio for steel is between_________________?
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A. 0.01 to 0.1

B. 0.23 to 0.27

C. 3 to 4

D. 0.25 to 0.33

E. 0.4 to 0.6

648. In a tensile test, near the elastic limit zone, the______________?
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A. tensile strain decreases in proportion to the stress

B. tensile strain increases in proportion to the stress

C. tensile strain decreases more quickly

D. tensile strain increases more quickly

E. tensile strain remains constant

649. If there are L number of links in a mechanism then number of possible inversions is equal to_______________?
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A. L + 2

B. L 1

C. L

D. L + 1

E. L 2

650. Cooling water is required for following equipment in ammonia absorption plant__________________?
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A. condenser

B. condenser, absorber and separator (rectifier)

C. evaporator

D. condenser and absorber

E. absorber

651. Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts___________________?
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A. mechanisms

B. applied mechanics

C. kinematics

D. kinetics

E. theory of machines

652. The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is_______________?
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A. four times

B. double

C. one-fourth

D. half

E. same

653. The property of a material which allows it to be drawn into a smaller section is called________________?
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A. drawabihty

B. elasticity

C. malleability

D. plasticity

E. ductility

654. Moisture in freon refrigeration system causes________________?
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A. ineffective refrigeration

B. high power consumption

C. freezing automatic regulating valve

D. corrosion of whole system

E. breakdown of refrigerant

655. Absorption system normally uses the following refrigerant___________________?
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A. C02

B. ammonia

C. S02

D. Freon-11

E. Freon-22

656. The example of lower pair is_______________?
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A. automobile steering gear

B. all of the above

C. none of the above

D. straight line motion mechanisms

E. shaft revolving in a bearing

657. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process ________________?
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A. involves no change in volume

B. takes place at constant enthalpy

C. takes place at constant pressure

D. takes place at constant entropy

E. takes place at constant temperature

658. Which of the following has no unit __________________?
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A. surface tension

B. bulk modulus

C. kinematic viscosity

D. elasticity

E. strain

659. The example of rolling pair is________________?
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A. bolt and nut

B. all of the above

C. ball and socket joint

D. ball bearing and roller bearing

E. lead screw of a lathe

660. The buckling load for a given material depends on___________________?
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A. slenderness ratio and area of cross-section

B. slenderness ratio, area of cross-section and modulus of elasticity

C. Poissons ratio and slenderness ratio

D. slenderness ratio and modulus of elasticity

E. Poissons ratio and modulus of elasticity

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