mechanical engineering MCQs – Page 35

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 Review each marked answer and report any item that may be outdated or unclear.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

681. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device____________________?
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A. capillary tube

B. expansion valve.

C. thermostatic valve

D. electrically operated throttling valve

E. manually operated valve

682. If a material expands freely due to heating it will develop ____________________?
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A. bending

B. tensile stress

C. thermal stresses

D. no stress

E. compressive stress

683. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is__________________?
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A. 45

B. 60

C. 90.

D. 0

E. 30

684. The domestic refrigerator uses following type of compressor ____________________?
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A. axial

B. piston type reciprocating

C. none of the above

D. centrifugal

E. miniature sealed unit

685. The elasticity of various materials is controlled by its___________________?
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A. proof stress

B. ultimate tensile stress

C. stress at elastic limit

D. tensile stress

E. stress at yield point

686. Hookes law holds good up to____________________?
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A. limit of proportionality

B. elastic limit

C. breaking point

D. plastic limit

E. yield point

687. For obtaining high COP, the pressure range of compressor should be_______________?
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A. high

B. any value

C. optimum

D. there is no such criterion

E. low

688. Which of the following would constitute a link__________________?
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A. piston, and piston rod

B. piston, piston-rod and cross head

C. piston, crank pin and crank shaft

D. piston, piston rings and gudgeon pin

E. piston rod and cross head

689. The locus of a point on a thread unwound from a cylinder will be___________________?
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A. cycloidal

B. involute

C. helix

D. a straight line

E. a circle

690. The weakest section of a diamond riveting is the section which passes through ___________________?
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A. one rivet hole of the end row

B. the first row

C. none of the above

D. the central row

E. the second row

691. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?
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A. more

B. same

C. less

D. unpredictable

E. more/less depending on rating

692. In a refrigeration cycle, the flow of refrigerant is controlled by___________________?
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A. expansion valve

B. evaporator

C. all of the above

D. compressor

E. condenser

693. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called______________________?
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A. transverse stress

B. compressive stress

C. working stress

D. tensile stress

E. internal resistanpe

694. For fluctuating loads, welsuited bearing is_________________?
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A. sleeve bearing

B. thrust bearing

C. needle roller bearing

D. roller bearing

E. ball bearing

695. When two plates are butt together and riveted with cover plates with two rows of rivets, the joi;it is known as ___________________?
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A. single riveted single cover butt joint

B. butt joint

C. double riveted double cover butt joint

D. single riveted double cover butt joint

E. lap point

696. The internal reaction in bottom 80 cm length will be________________?
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A. same in both cases

B. zero in first case

C. different in both cases

D. data are not sufficient to determine same

E. none of the above

697. Super heating in a refrigeration cycle __________________?
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A. decreases COP

B. COP remains unaltered

C. unpredictable

D. increases COP

E. other factors decide COP

698. For steel, the ultimate strength in shear as compared to in tension is nearly _________________?
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A. two-third

B. one-third

C. one-fourth

D. half

E. same

699. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?
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A. Freon

B. Carbon dioxide

C. Ammonia

D. Hydrocarbon refrigerant

E. Brine

700. The intensity of stress which causes unit strain is called_______________?
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A. principal stress

B. modulus of rigidity

C. unit stress

D. modulus of elasticity

E. bulk modulus

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