mechanical engineering MCQs – Page 23

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 Review each marked answer and report any item that may be outdated or unclear.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

441. The thermal diffusivities for solids are generally__________________?
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A. zerci

B. jess than those for liquids

C. less than those for gases

D. more than those for liquids and gases

E. more or less same as for liquids and gases

442. Which of the following has maximum value of thermal conductivity________________?
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A. lead

B. steel

C. aluminium

D. copper

E. brass

443. The weight of a body is due to ___________________?
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A. gravitational pull exerted by the earth

B. gravitational force of attraction towards the center of the earth

C. centripetal force of earth

D. force of attraction experienced by particles

E. forces experienced by body in atmosphere

444. Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in _________________?
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A. boiler

B. electric heater

C. melting of ice

D. steam condenser

E. refrigerator condenser coils

445. Plancks law holds good for________________?
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A. none of the above

B. black bodies

C. all coloured bodies

D. all of the above

E. polished bodies

446. A cable with a uniformly distributed load per horizontal meter run will take the following shape________________?
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A. elliptical

B. straight line

C. parabola

D. part of a circle

E. hyperbola

447. In a fission process, maximum %age of energy is released as___________________?
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A. instantaneous release of gamma rays

B. kinetic energy of neutrons

C. none of the above

D. gradual readioactive decay of fission products

E. kinetic energy of fission products

448. The insulation ability of an insulator with the presence of moisture would_________________?
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A. may increase/decrease depending on temperature and thickness of insulation

B. remain unaffected

C. increase

D. decrease

E. none of the above

449. In the equation of virtual work, following force is neglected_______________________?
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A. reaction of any smooth surface with which the body is in contact

B. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn

C. all of the above

D. reaction of a rough surface of a body which rolls on it without slipping

E. none of the above

450. In triggering fission, the following types of neutrons are desirable_________________?
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A. neutrons at rest

B. slow moving

C. none of the above

D. fast moving

E. critical neutrons

451. Pick up the wrong statement?
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A. Fast neutrons have energies above 1000 eV

B. Slow or thermal neutrons have energy of the order or 0.025 eV

C. Fast reactor uses moderator

D. Most serious drawback in using water as coolant in nuclear plants is its high vapour pressure

E. In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.

452. The unit of force in S.I. units is________________?
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A. dyne

B. joule

C. kilogram

D. watt

E. newton

453. According to principle of moments__________________?
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A. positive and negative couples can be balanced

B. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

C. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

D. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

E. none of the above

454. The unit of radio-activity is_____________?
0

A. electron-volt

B. curie

C. MeV

D. electron-ampere

E. AMU

455. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_______________?
0

A. 30

B. 45

C. 90.

D. 60

E. 0

456. The value of Prandtl number for air is about _______________________?
0

A. 0.7

B. 10.5

C. 1.7

D. 0.3

E. 0.1

457. The thermal diffusivities for gases are generally_____________________?
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A. same as for the liquids

B. more than those for liquids

C. less than those for liquids

D. more than those for solids

E. dependent on the viscosity

458. The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?
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A. thickness

B. time

C. temperature

D. area

E. area and time

459. Thermal conductivity of solid metals with rise in temperature normally___________________?
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A. remains constant

B. increases

C. decreases

D. may increase or decrease depending on temperature

E. unpredictable

460. Depending on the radiating properties, a body will be white when_________________?
0

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

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

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

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

E. x = 0, a + p = 1

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