mechanical engineering MCQs – Page 37

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 Review each marked answer and report any item that may be outdated or unclear.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

721. Relationship between the number of links (L) and number of pairs (P) is___________________?
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A. P = 2L+2

B. P = 2L-4

C. P = L-4

D. P = 2L + 4

E. P = 2L-2

722. In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be____________________?
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A. increase key depth

B. none of the above

C. increase key length

D. increase key width

E. double all the dimensions

723. Deformation per unit length in the direction of force is known as_________________?
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A. unit strain

B. linear stress

C. strain

D. linear strain

E. lateral strain

724. A completely constrained motion can be transmitted with __________________?
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A. 3 links with pin joints

B. all of the above

C. 1 link with pin joints

D. 4 links with pin joints

E. 2 links with pin joints

725. Resilience of a material is considered when it is subjected to_________________?
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A. creep

B. frequent heat treatment

C. resonant condition

D. shock loading

E. fatigue

726. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?
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A. unpredictable

B. increase

C. remain unaffected

D. decrease

E. may increase or decrease depending on the type of refrigerant used

727. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?
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A. depends on other factors

B. remains same

C. increases

D. none of the above

E. decreases

728. Critical pressure of a liquid is the pressure_________________?
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A. at which all the three phases exist together

B. above which liquid becomes vapour

C. above which liquid becomes gas

D. above which liquid will remain liquid

E. above which liquid becomes solid

729. The vapor pressure of refrigerant should be_________________?
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A. lower than atmospheric pressure

B. higher than atmospheric pressure

C. could be anything

D. none of the above

E. equal to atmospheric pressure

730. In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are ?
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A. average of the sum of moduli of elas-ticity

B. none of the above

C. inversely proportional to their moduli of elasticity

D. proportional to their respective moduli of elasticity

E. equal

731. Governor is used in automobile to_______________?
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A. all of the above

B. to control

C. none of the above

D. decrease the variation of speed

E. to control SN

732. The Kleins method of construction for reciprocating engine mechanism _______________?
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A. is based on acceleration diagram

B. is a simplified form of instantaneous center method

C. none of the above

D. enables determination of Coriolis component

E. utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

733. Youngs modulus is defined as the ratio of ___________________?
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A. lateral stress and lateral strain

B. longitudinal stress and longitudinal strain

C. shear stress to shear strain

D. longitudinal stress and lateral strain

E. volumetric stress and volumetric strain

734. To obviate axial thrust, following gear drive is used_____________________?
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A. none of the above

B. double helical gears having opposite teeth

C. mutter gears

D. double helical gears having identical teeth

E. single helical gear in which one of the teeth of helix angle a is more

735. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one_______________?
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A. none of the above

B. parabola

C. circle

D. hyperbola

E. ellipse

736. In automobiles the power is transmitted from gear box to differential through _________________?
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A. Knuckle joint

B. Hookes joint

C. bevel gear

D. Oldhams coupling

E. universal joint

737. Kinematic pairs are those which have two elements that ______________?
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A. have surface contact

B. have line contact

C. permit relative motion

D. are held together

E. have dynamic forces

738. For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be____________________?
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A. euqal

B. high

C. under some conditions small and under some conditions high

D. small

E. anything

739. If two moving elements have surface contact in motion, such pair is known as_________________?
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A. sliding pair

B. surface pair

C. rolling pair

D. higher pair

E. lower pair

740. The Hookes joint consists of ____________________?
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A. two forks

B. one fork

C. five forks

D. three forks

E. four forks

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