mechanical engineering MCQs – Page 22

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 Review each marked answer and report any item that may be outdated or unclear.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

421. Which of the following can be used as a coolant in nuclear plant________________?
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A. carbon tetrachloride

B. carbon dioxide

C. freon

D. molten lead

E. light or heavy water

422. When trying to turn a key into a lock, following is applied _____________________?
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A. moment

B. lever

C. coplanar force

D. couple

E. non-coplanar forces

423. The unit of overall coefficient of heat transfer is___________________?
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A. kcal/m3 hr C

B. kcal/m2

C. kcal/hr C

D. kcal/m2 hr C

E. kacl/m hr C

424. A force is completely defined when we specify_______________?
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A. all of the above

B. none of the above

C. direction

D. point of application

E. magnitude

425. Heat transfer by radiation mainly depends upon___________________?
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A. all of the above

B. its temperature

C. none of the above

D. nature of the body

E. kind and extent of its surface

426. Center of percussion is___________________?
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A. the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

B. the point of C.G.

C. point of suspension

D. the point of metacentre

E. the point in a body about which it can rotate horizontally and oscillate under the influence of gravity

427. A boiling water reactor uses following as fuel________________?
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A. U

B. plutonium

C. natural uranium.

D. enriched uranium

E. thorium

428. Choose the correct statement ________________?
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A. gas turbine is capable of rapid start up and loading

B. gas turbines have high standby losses and require lot of maintenance

C. gas turbine requires lot of cooling water

D. gas turbines have flat efficiency at part loads

E. gas turbines can be used to generate power only

429. The units of moment of inertia of mass are ________________?
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A. kg/m2

B. m2/kg

C. kg/m

D. m4

E. kg m2

430. Coefficient of friction is the_________________?
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A. angle between normal reaction and the resultant of normal reaction and the limiting friction

B. tangent of angle of repose

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

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

E. ratio of limiting friction and normal reaction

431. In vapor compression cycle, the condition of refrigerant is high pressure saturated liquid________________?
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A. before entering the expansion valve

B. before passing through the condenser

C. before entering the compressor

D. after passing through the expansion or thiottle valve

E. after passing through the condenser

432. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be_________________?
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A. none of the above

B. upwards at its upper end

C. zero at its upper end

D. downwards at its upper end

E. perpendicular to the wall at its upper end

433. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve ____________________?
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A. elliptical

B. hyperbola

C. circular arc

D. parabola

E. catenary

434. LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?
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A. same

B. lower

C. depends on the area of heat exchanger

D. higher

E. depends on temperature conditions

435. Heat is closely related with___________________?
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A. entropy

B. energy

C. liquids

D. enthalpy

E. temperature

436. The maximum frictional force which comes into play when a body just begins to slide over another surface is called__________________?
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A. limiting friction

B. kinematic friction

C. rolling friction

D. dynamic friction

E. sliding friction

437. Supertheated steam is generated in following reactor________________?
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A. none of the above

B. all of the above

C. pressurised water

D. boiling water

E. gas cooled

438. Absorptivity of a body will be equal to its emissivity___________________?
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A. for a polished body

B. at critical temperature

C. when system is under thermal equi-librium

D. at one particular temperature

E. at all temperatures

439. According to Wiens law, the wavelength corresponding to maximum energy is proportion to ________________?
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A. t

B. 1/r

C. absolute temperature (T)

D. I2

E. f

440. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction___________________?
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A. unpredictable

B. vertically

C. at an angle equal to the angle of friction to the inclined plane

D. horizontally

E. along the plane

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