mechanical engineering MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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

341. A non-dimensional number generally associated with natural convection heat transfer is________________?
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A. Prandtl number

B. Nusselt number

C. Reynold number

D. Grashoff number

E. Weber number

342. Pressurised water reactor is designed________________?
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A. for boiling pi water in the core

B. to eliminate the coolant loop of the pressurised water

C. to prevent the water coolant from boiling in the core

D. to use liquid sodium metal as coolant

E. to use intermediate coolant

343. The size of the reactor is said to be critical when_________________?
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A. it becomes uncontrollable

B. it produces no power

C. it explodes

D. chain reaction can be initiated

E. it produces tremendous power

344. Pick up the wrong statement ?
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A. centrifugal compressors deliver prac-tically constant pressure over a considerable range of capacities

B. axial flow compressors apt to be longer as compared to centrifugal type

C. Axial flow compressors have a sub-stantially constant delivery at variable pressures

D. axial flow compressors are bigger in diameter compared to centrifugal type

E. centrifugal compressors have a wider stable operating range than axial flow compressors

345. Unit of thermal conductivity in M.K.S. units is ___________________?
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A. kcal-m/m2 C

B. kcal/kg m2 C

C. kcal-m/hr m2 C

D. kcal/hr m2 C

E. kcal-m/hr C

346. In ideal machines__________________?
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A. mechanical advantage is greater than velocity ratio

B. mechanical advantage is unity

C. mechanical advantage is equal to velocity ratio

D. mechanical advantage is less than velocity ratio

E. none of the above

347. Reactors for propulsion applications use_________________?
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A. natural uranium

B. any form of uranium

C. plutonium

D. thorium

E. molten lead

348. Ammonia-absorption refrigeration cycle requires__________________?
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A. maximum work input

B. nearly same work input as for vapour compression cycle

C. very little work input

D. none of the above

E. zero work input

349. The function of control rods in nuclear plants is to__________________?
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A. control absorption of neutron

B. control temperature

C. none of the above

D. readioactive pollution

E. control fuel consumption

350. The time constant of a thermocouple is_______________?
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A. the time taken to attain the final temperature to be measured

B. the time taken to attain 63.2% of the value of initial temperature difference

C. none of the above

D. the time taken to attain 50% of the value of initial temperature difference

E. determined by the time taken to reach 100C from 0C

351. Depending on the radiating properties, body will be transparent when________________?
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A. p = 0, T= l,anda = 0

B. X = 0, a + p = 1

C. a = 0,x + p= 1

D. p=l,x = 0,anda = 0

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

352. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is__________________?
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A. double

B. four times

C. half

D. one fourth

E. same

353. The ratio of limiting friction and normal reaction is known as _____________________?
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A. angle of repose

B. friction resistance

C. angle of friction

D. coefficient of friction

E. sliding friction

354. In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than____________________?
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A. three members with unknown forces of the frame

B. two members with unknown forces of the frame

C. four members with unknown forces of the frame

D. three members with known forces of the frame

E. four members with two known forces

355. The C.G. of a plane lamina will not be at its geometrical centre in the case of a__________________?
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A. right angled triangle

B. square

C. equilateral triangle

D. circle

E. rectangle

356. 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. ellipse

B. circle

C. parabola

D. hyperbola

E. none of the above

357. If a rigid body is in equilibrium under the action of three forces, then _____________________?
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A. these forces are equal

B. the lines of action of these forces are parallel

C. the lines of action of these forces meet in a point

D. none of the above

E. B. and C. above

358. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as___________________?
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A. pins

B. plates

C. any one of the above

D. pallets

E. none of the above

359. Which of the following is not a vector quantity __________________?
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A. moment

B. weight

C. force

D. velocity

E. acceleration

360. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal_________________?
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A. metal will float in water

B. metal is twice as dense as water

C. none of the above

D. density of metal cant be determined

E. metal is twice as dense as unknown fluid

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