mechanical engineering MCQs – Page 125

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 Review each marked answer and report any item that may be outdated or unclear.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

2481. Fast breeder reactor uses___________________?
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A. single circuit system

B. boiler

C. direct cycle of coolant system

D. multi pass system

E. double circuit system of coolant cycle

2482. A nuclear unit becoming critical means_______________?
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A. it is capable of generating much more than rated capacity

B. it is generating power to rated capacity

C. chain reaction that causes automatic splitting of the fuel nuclei has been established

D. there is danger of nuclear spread

E. it generates no heat

2483. Ferrite material is____________________?
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A. the basic fuel for nuclear paints

B. the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

C. basic raw material for nuclear plants

D. the most fissionable material

E. none of the above

2484. Boiling water reactor uses the following as moderator, coolant and working fluid________________?
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A. ordinary fluid

B. heavy water

C. hydrogen gas

D. molten lead

E. none of the above

2485. The process by which a heavy nucleus is splitted into two light nuclei is known as_________________?
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A. chain reaction

B. disintegration

C. fusion

D. splitting

E. fission

2486. Amongst the following, the fissionable materials are________________?
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A. U233andPu239

B. U235andPu235

C. U23iandPu233

D. U243andPu235

E. U238andPu239

2487. The fast breeder reactor uses the following moderator__________________?
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A. graphite

B. carbon dioxide

C. demineralised water

D. no moderator is used

E. heavy water

2488. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?
0

A. there is no such criterion

B. none of the above

C. less

D. same

E. more

2489. In fast breeder reactors___________________?
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A. heavy water is used as the moderator

B. moderator may or may not be used

C. graphite is used as the moderator

D. any type of moderator can be used

E. moderator is dispensed with

2490. Breeder reactor has a conversion ratio of_____________________?
0

A. less than unity

B. zero

C. infinity

D. unity

E. more than unity

2491. Which of the following is the heaviest________________?
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A. neutron

B. atom

C. electron

D. nucleus

E. proton

2492. The number of isotopes of hydrogen are _________________?
0

A. 2

B. 3

C. 0

D. 1

E. U

2493. U238 will undergo fission by_________________?
0

A. high energy (fast) neutrons alone

B. none of the above

C. medium energy neutrons

D. either fast or slow neutrons

E. low energy (slow) neutrons alone

2494. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________?
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A. same

B. unity

C. lower

D. higher/lower depending on the size of reactor

E. higher

2495. One gram of uranium will produce energy equivalent to approximately____________________?
0

A. 100 tonnes of high grade coal

B. 1000 tonnes of high grade coal

C. 1 tonne of high grade coal

D. 10 tonnes of high grade coal

E. 4.5 tonnes of high grade coal

2496. The most commonly used moderator in nuclear plants is___________________?
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A. deutrium

B. graphite

C. graphite and concrete

D. concrete and bricks

E. heavy water

2497. The mass number of a substance represents the sum of total number of___________________?
0

A. protons and electrons in a nucleus

B. protons and neutrons in a nucleus

C. neutrons and electrons in an atom

D. protons and neutrons in an atom

E. protons and electrons in an atom

2498. The commonly used material for shielding is__________________?
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A. thick galvanised sheets

B. graphite or cadmium

C. lead or concrete

D. black carbon papers

E. lead and tin

2499. A nuclear fission produces energy of following order in MeV___________________?
0

A. 20

B. 200

C. 20,000

D. 2000

E. 2 x 105

2500. Moderator in nuclear plants is used to__________________?
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A. reduce temperature

B. moderate the radioactive pollution

C. control the reaction

D. extract heat from nuclear reaction

E. cause collision with the fast moving neutrons to reduce their speed

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