mechanical engineering MCQs – Page 28

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 Review each marked answer and report any item that may be outdated or unclear.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

541. The coolant used in boiling water reactor is________________?
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A. pressurised water

B. mixture of water and steam

C. Co2

D. liquid metal

E. mercury

542. Thermal diffusivity of a substance is __________________?
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A. none of the above

B. inversely proportional to density of substance

C. all of the above

D. directly proportional to thermal conductivity

E. inversely proportional to specific heat

543. According to principle of transmissibility of forces, the effect of a force upon a body is_________________?
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A. different at different points in its line of action

B. maximum when it acts at the center of gravity of a body

C. minimum when it acts at the C.G. of the body

D. the same at every point in its line of action

E. none of the above

544. A standard ice point temperature corresponds to the temperature of ___________________?
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A. ice at 4C

B. mixture of ice and water Under equilibrium conditions

C. water at 0C

D. solid and dry ice

E. mixture of ice, water and vapour under equilibrium conditions under NTP conditions

545. In vapour compression cycle the condition of refrigerant is superheated vapour _____________________?
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A. after passing through the expansion or throttle valve

B. before passing through the condenser

C. before [entering the expansion valve

D. after passing through the condenser

E. before entering the compressor

546. According of Kirchhoffs law______________________?
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A. radiant heat is proportional to fourth power of absolute temperature

B. ratio of emissive power to absorptive power is maximum for perfectly black body

C. emissive power depends on temperature

D. emissive power and absorptivity are constant for all bodies

E. ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

547. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be_________________?
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A. r/2

B. 3r/2

C. 2r/3

D. r/A

E. 3r/A

548. Which of the following is secondary fuel ?
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A. non oh these

B. U233andPu239

C. U233andPu238

D. Th232andU238

549. Clapeyron equation is a relation between___________________?
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A. specific volume and enthalpy

B. temperature, pressure, specific volur andenthalpy

C. temperature and enthalpy

D. temperature, pressure, and specil volume

E. temperature, pressure and enthalpy

550. Tangent of angle of friction is equal to__________________?
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A. angle of repose

B. friction force

C. kinetic friction

D. coefficient of friction

E. limiting friction

551. The center of percussion of the homogeneous rod of length L suspended at the top will be___________________?
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A. 3L/4

B. 2L/3

C. L/3

D. L/2

E. 3L/8

552. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is \i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
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A. slant down towards direction of pull

B. unpredictable

C. none of the above

D. remain horizontal

E. slant up towards direction of pull

553. Which of the following is more appropriate for a moderator. One which_________________?
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A. accelerates neutrons

B. absorbs neutrons

C. does not absorb neutrons

D. eats up neutrons

E. regenerates neutrons

554. One ton refrigeratiqn corresponds to_________________?
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A. 80 kcal/min

B. 1000 kcal/day

C. 50 kcal/kr

D. 50 kcal/min

E. 80 kcal/hr

555. Thermal diffusivity of a substance is ____________________?
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A. none of the above

B. proportional to (k)

C. proportional of thermal conductivity

D. inversely proportional to k

E. inversely proportional to k2

556. A refrigerant should have _____________________?
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A. higher critical temperature

B. high boiling point

C. Tow specific heat of liquid

D. low specific volume of vapour

E. high latent heat of vaporisation

F. k up the wrong statement ?

557. The possible loading in various members of framed structures are_________________?
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A. buckling or shear

B. bending

C. shear or tension

D. all of the above

E. compression or tension

558. The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is__________________?
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A. lower temperature and pressure condi-tions

B. high heat rejection in condenser

C. high initial cost

D. nuclear hazard risk

E. higher cost of nuclear fuel

559. In boiling water reactor, moderator is__________________?
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A. liquid sodium metal

B. graphite rod

C. ferrite rod

D. blanket of thorium

E. coolant itself

560. Pick up the false statement ?
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A. exhaust losses in gas turbine are high due to large mass flow rate

B. gas turbine does not require huge quantity of water like steam plant

C. gas turbine can be easily started and stopped and thus is best suited for peaking demands

D. gas turbine is a self-starting unit

E. overall efficiency of gas turbine plant is lower than that of a reciprocating engine

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