mechanical engineering MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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

381. The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is____________________?
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A. deuterium

B. lithium

C. thorium

D. uranium

E. plutonium

382. In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?
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A. convection

B. radiation

C. conduction

D. both convection and conduction

E. none of the above

383. Which of the following cycles uses air as the refrigerant__________________?
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A. Bell-coleman

B. Ericsson

C. Carnot

D. none of the above

E. Stirling

384. In counter flow heat exchangers_________________?
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A. both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

B. both the fluids at inlet are in their hottest state

C. both the fluids .at exit are in their hottest state

D. one fluid is in hottest state and other in coldest state at inlet

E. any combination is possible depending on design of heat exchanger

385. In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________?
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A. equal to 1.0

B. equal to zero

C. less than 1.0

D. equal to infinity

E. greater than 1.0

386. Thermal conductivity of water at 20C is of the order of_____________________?
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A. 0.64

B. 0.23

C. 0.51

D. 0.42

E. 0.1

387. Which of the following is the case of heat transfer by radiation ___________________?
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A. all of the above

B. heating of building

C. blast furnace

D. heat received by a person from fireplace

E. cooling of parts in furnace

388. Dynamic friction as compared to static friction is___________________?
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A. may be less of more depending on nature of surfaces and velocity

B. same

C. more

D. less

E. has no correlation

389. The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj 2K2 will be ________________?
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A. 0.5

B. 0.25

C. 2

D. 4

E. I

390. Depending on the radiating properties, a body will be black when_________________?
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A. p= l,T = 0anda = 0

B. a = 0,x + p= 1.

C. x = 0, a + p = 0

D. p = 0, x = 1 and a = 0

E. p = 0, x = 0 and a = 1

F. re a = absorptivity, p == reflectivity, X = transmissivity

391. All radiations in a black body are___________________?
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A. partly reflected and partly absorbed

B. transmitted

C. reflected

D. absorbed

E. refracted

392. Heat flows from one body to other when they have_________________?
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A. none of the above

B. different temperatures

C. different specific heat

D. different heat contents

E. different atomic structure

393. The C.G. of a solid hemisphere lies on the central radius 3r________________?
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A. at distance from the plane base 3r

B. at distance from the plane base 3r

C. at distance from the plane base 3r

D. at distance from the plane base

E. at distance from the plane base or

394. Which of the following statement is wrong ?
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A. The mortise gauge has two scribing pins

B. all of these

C. The gouges are chisels with a hollow shaped blade

D. An auger is a planning tool

395. The amount of heat flow through a body by conduction is_______________?
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A. inversely proportional to the thickness of the body

B. directly proportional to the surface area of the body

C. dependent upon the material of the body

D. all of the above

E. directly proportional to the temperature difference on the two faces of the body

396. Heat transfer in liquid and gases takes place by_____________________?
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A. convection

B. radiation

C. conduction and convection

D. convection and radiation

E. conduction

397. Clapeyron equation is applicable for registration at___________________?
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A. saturation point of liquid

B. sublimation temperature

C. triple point

D. critical point

E. saturation point of vapor

398. Fouriers law of heat conduction is valid for_________________?
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A. regular surfaces having non-uniform temperature gradients

B. three dimensional cases only

C. irregular surfaces

D. one dimensional cases only

E. two dimensional cases only

399. Unit of thermal conductivity in S.I. units is__________________?
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A. J/m K sec

B. A. and C. above

C. J/m2 sec

D. B. and C. above

E. W/m K

400. Friction force for dry surfaces. Friction force is________________?
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A. k up wrong statement?

B. dependent on the materials of contact surface

C. none of the above is wrong statement

D. proportional to velocity of sliding

E. proportional to normal load between the surfaces

F. independent of the area of contact surfaces

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