mechanical engineering MCQs – Page 52

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 Review each marked answer and report any item that may be outdated or unclear.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

1021. Molecular volume of any perfect gas at 600 x 103 N/m2 and 27C will be ____________________?
0

A. 0.15 m3/kg mol

B. 417m3/kgmol

C. 400 m3/kg mol

D. 41.7 m3/kg mol

E. 4.17m3/kgmol

1022. Polar moment of inertia (IP) of ac disc is to ht determined by suspen by a wire and noting the frequei oscillations (f) ?
0

A. Ipoc-

B. Ipocf

C. none of the above

D. Ipocf

E. Ip oc j

1023. The behaviour of gases can be fully determined by___________________?
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A. 3 laws

B. 4 laws

C. 1 law

D. 2 laws

1024. For which of the following substances, the gas laws can be used with minimum error_________________?
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A. steam at atmospheric pressure

B. dry steam

C. saturated steam

D. superheated steam

E. wet steam

1025. Work done is zero for the following process_________________?
0

A. free expansion

B. constant volume

C. all Of the above

D. none of the above

E. throttling

1026. Extensive property of a system is one whose value______________________?
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A. depends on the mass of the system like volume

B. is always constant

C. does not depend on the mass of the system, like temperature, pressure, etc.

D. is not dependent on the path followed but on the state

E. is dependent on the path followed and not on the state

1027. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links_________________?
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A. will not occur

B. will change

C. none of the above

D. will remain same

E. could change or remain unaltered depending oh which link is fixed

1028. The Bifilar suspension method is used to determine__________________?
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A. natural frequency of vibration

B. moment of inertia

C. angular acceleration of a body

D. centripetal acceleration

E. position of balancing weights

1029. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is____________________?
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A. divided by its molecular weight

B. multiplied by its density

C. multiplied by its molecular weight

D. divided by its specific weight

E. multiplied by its specific weight

1030. A typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is________________?
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A. none of the above

B. kinematically sound

C. soundness would depend upon which link is kept fixed

D. not sound

E. data is not sufficient to determine same

1031. A panto graph is a mechanism with___________________?
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A. spherical pairs

B. higher pairs

C. rolling pairs

D. turning pairs

E. lower pairs

1032. Work done in a free expansion process is___________________?
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A. #NAME?

B. maximum

C. minimum

D. #NAME?

E. zero

1033. The property of a material which enables it to resist fracture due to high impact loads is known as__________________?
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A. elasticity

B. strength

C. endurance

D. toughness

E. resilience

1034. Higher pairs are those which have_________________?
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A. elements of pairs not held together mechanically

B. point or line contact between the two elements when in motion

C. surface contact between the two ele-ments when in motion

D. none of the above

E. two elements that permit relative motion

1035. The unit of pressure in S.I. units is____________________?
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A. dynes per square cm

B. bars

C. mm of water column

D. kg/cm2

E. pascal

1036. Fatigue strength can be increased by__________________?
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A. cold working

B. hot working

C. shot peening

D. using gradual changes of section

E. grinding and lapping surface

1037. One barometric pressure or 1 atmospheric pressure is equal to___________________?
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A. 100 kgf/cm2

B. 1.033 kgf/cm2

C. 1.0197 kgf/cm2

D. 0 kgf/cm2

E. 1 kgf/cnr2

1038. Brayton cycle consists of following four processes____________________?
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A. two isentropics and two constant volumes

B. two isothermals and two isentropics

C. two isentropics, one constant volume and one constant pressure

D. two isentropics and two constant pres-sures

E. none of the above

1039. Water contained in a beaker can be made to boil by passing steam through it__________________?
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A. at atmospheric pressure

B. at a pressure below the firuosphejric pressure

C. not possible

D. at a pressure greater than atmospheric pressure

E. any pressure

1040. The sense of Coriolis component is such that it_________________?
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A. leads the sliding velocity vector by 180

B. leads the sliding velocity vector by 90

C. is along the sliding velocity vector

D. none of the above

E. lags the sliding velocity vector by 90

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