mechanical engineering MCQs – Page 128

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 Review each marked answer and report any item that may be outdated or unclear.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

2541. Pressurised water reactor is designed________________?
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A. to prevent the water coolant from boiling in the core

B. to use intermediate coolant

C. for boiling pi water in the core

D. to eliminate the coolant loop of the pressurised water

E. to use liquid sodium metal as coolant

2542. Pick up the wrong statement?
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A. In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.

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

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

D. Fast neutrons have energies above 1000 eV

E. Fast reactor uses moderator

2543. Effective moderators are those materials which contain____________________?
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A. heavy weight atoms

B. there is no such criterion

C. zero weight atoms

D. critical atoms

E. light weight atoms

2544. The following present serious difficulty in designing reactor shield_________________?
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A. alpha particles

B. beta particles

C. thermal neutrons

D. fast neutrons and gamma rays

E. none of the above

2545. A pressurised water reactor employs pressuriser for the following application________________?
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A. to Supply high pressure steam

B. to increase pressure of water in primary circut

C. all of the above

D. to maintain constant pressure in primary circuit under varying load

E. to provide subcooled water at high pressure

2546. When a reactor becomes critical, then the production of neutrons is_________________?
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A. zero

B. stopped

C. initiated

D. exactly balanced by the loss of neutrons through leakage

E. infinite

2547. In nuclear fission___________________?
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A. the original elements change into completely different elements

B. none of the above

C. the molecules rearrange themselves to form other molecules

D. strong>. the electrons of the element change

2548. Plutonium-239 is produced__________________?
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A. by neutron irradiation of IT*

B. by neutron irradiation of thorium

C. as basic raw material

D. in high capacity furnaces

E. artificially

2549. The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is__________________?
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A. lower temperature and pressure condi-tions

B. nuclear hazard risk

C. high initial cost

D. higher cost of nuclear fuel

E. high heat rejection in condenser

2550. Artificial radioactive isotopes find application in________________?
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A. nuclear fusion

B. nuclear fission

C. medical field

D. nucleonic devices

E. power generation

2551. Natural uranium is made up of__________________?
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A. 99.282% U234, 0.712% U238, 0.006% U235

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

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

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

E. none of the above

2552. A reactor capable of converting a ferrite material into fissile isotopes is called____________________?
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A. boiling water reactor

B. fast breeder reactor

C. regenerative reactor

D. breeder reactor

E. ferrite reactor

2553. Electron-volt is the unit of________________?
0

A. there is no such unit.

B. energy

C. atomic power

D. radio activity

E. voltage

2554. In boiling water reactor, moderator is__________________?
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A. graphite rod

B. ferrite rod

C. coolant itself

D. blanket of thorium

E. liquid sodium metal

2555. For economical operation of a nuclear plant__________________?
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A. reflector should be used

B. used fuel should be reprocessed

C. coolant should be employed

D. moderator should be used

E. control rods should be used

2556. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00C will _________________?
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A. decrease

B. remain same

C. show unpredictable behaviour

D. increase

E. first increase and then decrease

2557. The unique property of cast iron is its high ___________________?
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A. ductility

B. hardness

C. damping characteristics

D. malleability

E. surface finish

2558. A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
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A. molecular change

B. allotropic change

C. atomic change

D. solidus change

E. physical change

2559. Malleability of a material can be defined as ______________________?
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A. all of the above

B. ability to undergo large permanent deformations in compression

C. none of the above

D. ability to undergo large permanent deformations in tension

E. ability to recover its original form

2560. The ability of a material to resist softening at high temperature is known as____________________?
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A. creep

B. hot hardness

C. superhardening

D. hot tempering

E. fatigue

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