mechanical engineering MCQs – Page 24

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 Review each marked answer and report any item that may be outdated or unclear.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

461. The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?
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A. transmissivity

B. reflectivity

C. absorptivity

D. intensity of radiation

E. emissivity

462. A fast breeder reactor uses_______________?
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A. 90% U-235

B. U-235

C. Pu-239

D. U-238

E. U-239

463. Which of the following is not the unit of energy_________________?
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A. kg m

B. kcal

C. watt hours

D. wattr

E. kg m x (m/sec)2

464. Natural uranium is made up of__________________?
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A. none of the above

B. 99.282% U238, 0.712% U235, 0.006% U234

C. 99.282% U234, 0.712% U238, 0.006% U235

D. 99.282% U235, 0.712% U238, 0.06% U234

E. 99.282% U235, 0.712% U234, 0.006% U238

465. Which of the following is expected to have highest thermal conductivity_______________?
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A. water

B. solid ice

C. steam

D. boiling water

E. melting ice

466. In vapor compression cycle, the condition of refrigerant is very wet vapor________________?
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A. before entering the compressor

B. after passing through the expansion or throttle valve

C. after passing through the condenser

D. before entering the expansion valve

E. before passing through the condenser

467. When heat is Transferred by molecular collision, it is referred to as heat transfer by __________________?
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A. scattering

B. radiation

C. conduction

D. convection and radiation

E. convection

468. In free con-vection heat transfer, Nusselt number is function of________________?
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A. Prandtl no. and Reynold no

B. Grashoff no., Prandtl no and Reynold no

C. Grashoff no. and Reynold no

D. none of the above

E. Grashoff no and Prandtl no.

469. The vapor compression refrigerator employs the following cycle_________________?
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A. Brayton

B. Rankine

C. Reversed Carnot

D. Carnot

E. Reversed Rankine

470. Forces are called coplanar when all of them acting on body lie in __________________?
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A. different planes

B. one point

C. one plane

D. different points

E. perpendicular planes

471. The boiling point of ammonia is___________________?
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A. 33.3C

B. 0C

C. -100C

D. -50C

E. 33.3C

472. Thermal conductivity of wood depends on_______________?
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A. moisture

B. temperature

C. all of the above

D. none of the above

E. density

473. In heat transfer, conductance equals conductivity (kcal/hr/sqm/C/cm) divided by ________________?
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A. C (temperature)

B. kcal (heat).

C. hr (time)

D. sqm (area)

E. cm (thickness)

474. Joule sec is the unit of_________________?
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A. universal gas constant

B. Plancks constant

C. thermal conductivity

D. kinematic viscosity

E. none of the above

475. In vapour compression cycle, the conditii of refrigerant is saturated liquid________________?
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A. before passing through the condensei

B. before entering the compressor

C. after passing through the condenser

D. after passing through the expansion throttle valve

E. before entering the expansion valve

476. Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal_________________?
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A. centrifugal

B. diaphragm

C. axial

D. reciprocation

E. electromagnetic

477. Plutonium is produced________________?
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A. by neutron irradiation of throium

B. in high capacity furnace

C. as basic raw material

D. artificially

E. by neutron irradiation of Uz

478. The moisture in a refrigerant is removed by___________________?
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A. safety relief valve

B. expansion valve

C. driers

D. dehumidifier

E. evaporator

479. Emissivity of a white polished body in comparison to a black body is________________?
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A. depends upon the shape of body

B. none of the above

C. lower

D. same

E. higher

480. The product of either force of couple with the arm of the couple is called_________________?
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A. moment of the couple

B. resulting couple

C. none of the above

D. resultant couple

E. moment of the forces

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