mechanical engineering MCQs – Page 127

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 Review each marked answer and report any item that may be outdated or unclear.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

2521. Which of the following is secondary fuel ?
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A. non oh these

B. U233andPu238

C. U233andPu239

D. Th232andU238

2522. Pick up the wrong statement Fast breeder reactors__________________?
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A. are unmoderated

B. are liquid-metal cooled

C. produce more fuel than they consume

D. use water as coolant

E. operate at extremely high power densities.

2523. Enriched uranium may contain fissionable contents of the order of__________________?
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A. 1-90%.

B. 1-50%

C. 1-75%

D. 1-25%

E. 1-99%

2524. In a fission process, maximum %age of energy is released as___________________?
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A. gradual readioactive decay of fission products

B. kinetic energy of neutrons

C. none of the above

D. instantaneous release of gamma rays

E. kinetic energy of fission products

2525. Which of the following is more appropriate for a moderator. One which_________________?
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A. absorbs neutrons

B. regenerates neutrons

C. does not absorb neutrons

D. accelerates neutrons

E. eats up neutrons

2526. Breeder reactors employ liquid metal coolant because it_______________?
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A. produces maximum steam

B. breeds neutrons

C. transfers heat from core at a fast rate

D. acts as good moderator

E. increases rate of reaction in core

2527. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as___________________?
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A. any one of the above

B. plates

C. pins

D. none of the above

E. pallets

2528. The size of the reactor is said to be critical when_________________?
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A. chain reaction can be initiated

B. it produces no power

C. it explodes

D. it produces tremendous power

E. it becomes uncontrollable

2529. Each fission of U235 produces following number of fast neutrons per fission________________?
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A. 1 neutrons

B. infinite

C. 2 neutrons

D. 1 neutron

E. 1 2 neutrons

2530. In triggering fission, which type of neutrons are more effective_________________?
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A. activated

B. static

C. in bulk

D. slow

E. fast

2531. The coolant used in boiling water reactor is________________?
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A. Co2

B. mixture of water and steam

C. liquid metal

D. mercury

E. pressurised water

2532. The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is____________________?
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A. thorium

B. lithium

C. deuterium

D. uranium

E. plutonium

2533. Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal_________________?
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A. reciprocation

B. axial

C. electromagnetic

D. diaphragm

E. centrifugal

2534. The energy produced by a thermal reactor of same size as a breeder reactor is__________________?
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A. much more.

B. slightly less

C. almost same

D. slightly more

E. much less

2535. A fast breeder reactor uses_______________?
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A. U-239

B. Pu-239

C. U-238

D. 90% U-235

E. U-235

2536. Which of the following is the primary fuel________________?
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A. U

B. U238

C. Pu

D. Pu:

E. Ulii

2537. The unit of radio-activity is_____________?
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A. curie

B. electron-ampere

C. AMU

D. electron-volt

E. MeV

2538. A boiling water reactor uses following as fuel________________?
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A. plutonium

B. thorium

C. enriched uranium

D. natural uranium.

E. U

2539. Reactors for propulsion applications use_________________?
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A. natural uranium

B. molten lead

C. thorium

D. any form of uranium

E. plutonium

2540. Reactors designed for propulsion applications are designed for_______________?
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A. enriched uranium

B. pure uranium

C. none of the above

D. natural uranium

E. any type of uranium

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