mechanical engineering MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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

401. Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?
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A. less thermal conductivity insulator

B. high thickness of insulation

C. all of the above

D. a vapour seal

E. high vapour pressure

402. In the breeder reactors the generation of new fissionable atom is_________________?
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A. unpredictable

B. at an equal rate of the consumption

C. at a higher rate than the constuption

D. at the lower rate than the consumption

E. depends on other considerations

403. If n = number of members andy = number of joints, then for a perfect frame, n =_________________?
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A. 2/-3

B. 3/-2

C. 2/ -4

D. j-2

E. 2j-l

404. The ratio of the energy absorbed by the body to total energy falling on it is called_________________?
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A. absorptive power

B. emissive power

C. none of the above

D. absorptivity

E. emissivity

405. Plutonium-239 is produced__________________?
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A. by neutron irradiation of IT*

B. as basic raw material

C. artificially

D. by neutron irradiation of thorium

E. in high capacity furnaces

406. The unit of work or energy in S.I. units is_______________?
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A. newton

B. pascal

C. kilogram meter

D. joule

E. watt

407. Pick up the wrong statement Fast breeder reactors__________________?
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A. produce more fuel than they consume

B. use water as coolant

C. operate at extremely high power densities.

D. are unmoderated

E. are liquid-metal cooled

408. Unit of thermal diffusivity is_________________?
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A. m2/hrC

B. kcal/m2 hr

C. kcal/m.hrC

D. kcal/m2 hrC

E. m2/hr

409. The energy produced by a thermal reactor of same size as a breeder reactor is__________________?
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A. slightly more

B. almost same

C. slightly less

D. much more.

E. much less

410. Pick up the correct statement ?
0

A. none of the above

B. all of the above

C. gas turhine uses high air-fuel ratio to reduce outgoing temperature

D. gas turbine uses low air-fuel ratio to economise on fuel

E. gas turbine uses low air-fuel ratio to develop the high thrust required

411. When a reactor becomes critical, then the production of neutrons is_________________?
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A. infinite

B. initiated

C. zero

D. exactly balanced by the loss of neutrons through leakage

E. stopped

412. The units of moment of inertia of an area are__________________?
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A. kg/m4

B. kg m2

C. m3

D. kg/m2

E. m4

413. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span___________________?
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A. 2.0 cm

B. 2.5 cm

C. 5.0 cm

D. 3.0 cm

E. 4.0 cm

414. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?
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A. may be higher or lower depending upon the nature of non-condensable gases

B. unpredictable

C. will be higher

D. will be lower

E. will remain unaffected

415. The C.G. of a right circular solid cone of height h lies at the following distance from the base______________?
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A. h/4

B. h/6

C. 3/i/5

D. J/3

E. h/2

416. If the temperature of a solid surface changes form 27C to 627C, then its emissive power changes in the ratio of___________________?
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A. 81

B. 27

C. 6

D. 3

E. 9

417. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be___________________?
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A. downwards at its upper end

B. upwards at its upper end

C. towards the wall at its upper end

D. away from the wall at its upper end

E. none of the above

418. Thermal conductivity of air with rise in temperature__________________?
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A. remains constant

B. may increase or decrease depending on temperature

C. none of the above

D. increases

E. decreases

419. The algebraic sum of moments of the forces forming couple about any point in their plane is_________________?
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A. equal to the moment of the couple

B. constant

C. both of above are correct

D. both of above are wrong

E. none of the above

420. Sensible heat is the heat required to __________________?
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A. convert saturated steam into dry steam

B. increase the temperature of a liquid of vapour

C. change vapour into liquid

D. convert water into steam and superheat it

E. change liquid into vapour

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