mechanical engineering MCQs – Page 27

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 Review each marked answer and report any item that may be outdated or unclear.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

521. Which of the following has least value of conductivity_________________?
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A. rubber

B. air

C. glass

D. water

E. plastic

522. The necessary condition for forces to be in equilibrium is that these should be_________________?
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A. coplanar

B. meet at one point ;

C. both A. and B. above

D. all be equal

E. something else

523. Center of gravity of a thin hollow cone lies on the axis at a height of ___________________?
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A. one-half of the total height above base

B. none of the above

C. one-third of the total height above base

D. one-fourth of the total height above base

E. three-eighth of the total height above the base

524. A fission chain reaction in uranium can be developed by________________?
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A. enriching U235

B. accelerating fast neutrons

C. slowing down fast neutrons so that Uz fission continues by slow motion neutrons

D. using moderator

E. absorbing all neutrons

525. Depending on the radiating properties, a body will be opaque when _________________?
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A. x 0, a + p = 1

B. a=0,x + p= 1.

C. p = 0, x = 0 and a = 1

D. p = 0, x = 1 and a = 0

E. p=l,x = 0anda = 0

526. A fast breeder reactor uses following as fuel_________________?
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A. enriched uranium

B. thorium

C. natrual uranium

D. plutonium

E. U235

527. Artificial radioactive isotopes find application in________________?
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A. power generation

B. nuclear fusion

C. nuclear fission

D. nucleonic devices

E. medical field

528. Two non-collinear parallel equal forces acting in opposite direction__________________?
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A. constitute a resultant couple

B. constitute a couple

C. balance each other

D. constitute a moment of couple

E. constitute a moment

529. Limiting force of friction is the__________________?
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A. ratio of limiting friction and normal reaction

B. minimum force of friction

C. the friction force acting when the body is in motion

D. the friction force acting when the body is just about to move

E. tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction

530. A framed structure is perfect if it contains members equal to_________________?
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A. n-l

B. 2n-l

C. 3n-2.

D. 2n-3

E. re n = number of joints in a frame

F. n 2

531. Pick up the correct statement ?
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A. large gas turbines use radial inflow turbines

B. gas turbines have their blades similar to steam turbine

C. gas .turbines blade will appear as impulse section at the hub and as a reaction section at tip

D. gas turbines use both air and liquid cooling

E. all of the above are correct.

532. Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?
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A. atmospheric pressure

B. slightly above atmospheric pressure

C. 7-10 bars

D. 5-6 bars

E. 2-4 bars

533. The forces, which meet at one point, but their lines of action do not lie in a plane, are called_________________?
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A. none of the above

B. non-coplanar concurrent forces

C. coplanar non-concurrent forces

D. non-coplanar non-concurrent forces

E. intersecting forces

534. In nuclear fission___________________?
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A. the molecules rearrange themselves to form other molecules

B. none of the above

C. the original elements change into completely different elements

D. strong>. the electrons of the element change

535. Stefan Boltzmann law is applicable for heat transfer by __________________?
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A. convection

B. conduction and radiation combined

C. radiation

D. convection and radiation combined

E. conduction

536. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice_________________?
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A. in 24 hours

B. in 1 hour

C. in 10 hours

D. in 12 hours

E. in 1 minute

537. In regenerator type heat exchanger, heat transfer takes place by___________________?
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A. direct mixing of hot and cold fluids

B. indirect transfer

C. flow of hot and cold fluids alternately over a surface

D. a complete separation between hot and cold fluids

E. generation of heat again and again

538. Pick up the wrong statement ?
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A. bypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy

B. pulsojet requires no ambient air for propulsion

C. ramjet-engine has no turbine

D. turbine drives compressor in a burbojet

E. propeller is an indirect reaction device

539. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly_________________?
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A. 240 m

B. 38 m

C. 62.5 m

D. 124 m

E. 96 m

540. According to Kirchoffs law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?
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A. none of the above

B. black body

C. grey body

D. red hot body

E. brilliant white polished body

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