mechanical engineering MCQs – Page 124

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 Review each marked answer and report any item that may be outdated or unclear.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

2461. The main disadvantage of the sliding pair is that it is_________________?
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A. A. and C. above

B. difficult to manufacture

C. wears rapidly

D. bulky

E. A. and B. above

2462. Coriolis component of acceleration exists whenever a point moves along a path that has________________?
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A. linear displacement

B. rotational motion

C. tangential acceleration

D. centripetal acceleration

E. none of the above

2463. Cylindrical cams can be classified as_________________?
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A. circular

B. tangent

C. all of the above

D. none of the above

E. reciprocating

2464. Kinematic pairs are those which have___________________?
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A. minimum of two instantaneous centres

B. two elements having Coroilis com-ponent

C. all of the above

D. two elements having relative motion

E. two elements held together mechani-cally

2465. Which is not identical for an atom and an isotope_________________?
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A. atomic number

B. all of the above

C. position in periodic table

D. chemical properties

E. mass number

2466. Reflector in nuclear plants is used to________________?
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A. conserve energy

B. is not used

C. return the neutrons back into the core

D. shield the radioactivity completely

E. check polllution

2467. Gas cooled reactor uses following materials as moderator, and coolant____________________?
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A. concrete, N2

B. heavy water, C02

C. graphite, C02

D. lead, H2

E. graphite, air

2468. Isotopes of same elements have___________________?
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A. same chemical properties but different atomic numbers

B. same chemical properties and same atomic numbers

C. same atomic number and different masses

D. different chemical properties and same atomic numbers

E. different masses and different atomic numbers

2469. Hydrogen is preferred as better coolant in comparison to C02 because former_____________________?
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A. is a good conductor

B. has high specific heat

C. is lighter

D. is inert

E. all of the above

2470. In nuclear fission each neutron that causes fission releases_______________?
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A. more than one new neutrons

B. no new neutron

C. one new neutron

D. many-fold neutrons

E. at least one new neutron

2471. Enriched uranium is one in which__________________?
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A. all impurities have been removed

B. extra energy is pumped from outside

C. %age of U235 has been artificially in-creased

D. %age of U has been artificially increased

E. %age of U234 has been artificially in-creased

2472. Which of the following particles is the lightest__________________?
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A. neutron

B. meson

C. proton

D. electron

E. nucleus

2473. Boiling water reactor employs__________________?
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A. double circuit system of coolant cycle

B. single circuit system

C. multi pass system

D. direct cycle of coolant system

E. boiler

2474. Which of the following nuclear reactor does not need a heat exchanger for generation of steam____________________?
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A. gas cooled

B. pressurised water

C. liquid metal cooled

D. none of the above

E. boiling water

2475. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is________________?
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A. more

B. same

C. may be less or mote depending on size

D. unpredictable

E. less

2476. The first unclear power plant in India is located at____________________?
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A. Kota

B. Tarapur

C. Baraeilly

D. Kalapakkam

E. Kerala

2477. The nuclear energy is measured as__________________?
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A. MW

B. MeV

C. curie

D. kWhr

E. farads

2478. Atomic number of an element in the periodic table represents the numbers of_________________?
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A. neutrons in the nucleus

B. electrons in the atom

C. protons in the nucleus

D. electrons in me nucleus

E. neutrons in the atom

2479. The total energy released in fission of U is__________________?
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A. 10 MeV

B. 199 MeV

C. 11 MeV

D. 168 MeV

E. 5 MeV

2480. The main interest of shielding in nuclear reactor is protection against_______________?
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A. neutrons and gamma rays

B. X-rays

C. infra-red rays

D. a, P, and y rays

E. electrons

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