mechanical engineering MCQs – Page 169

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 Review each marked answer and report any item that may be outdated or unclear.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

3361. The high pressure boiler is oiie producing steam at a pressure more than_________________?
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A. 5 kg/cm2

B. 75-80 kg/cm2

C. 10 kg/cm2

D. 40 kg/cm2

E. atmospheric pressure

3362. Sublimation region is the region where__________________?
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A. solid and vapour phases are in equi-librium

B. liquid and vapour phases are in equilibrium

C. solid, liquid and vapour phases are in equilibrium

D. none of the above

E. solid and liquid phases are in equilibrium

3363. Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?
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A. room temperature

B. 100C

C. saturation temperature at given pressure

D. 0C

E. 20C

3364. Which of the following boilers is best suited to meet fluctuating demands___________________?
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A. cochran

B. lancashire

C. locomotive

D. babcock and wilcox

E. comish

3365. Equivalent evaporation of water is the evaporation for a feed water supply at 100C__________________?
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A. and its corresponding conversion into dry steam at desired boiler pressure

B. and its corresponding conversion into dry saturated steam at 100C and 1.033 kg/cm2

C. conversion into steam at the same pres-sure at which feed water is supplied

D. conversion into steam at atmospheric condition

E. none of the above

3366. Locomotive type boiler is__________________?
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A. water wall enclosed furnace type

B. horizontal multi-tubular fire tube type

C. vertical tubular fire tube type

D. none of the above types

E. horizontal multitubular water tube boiler

3367. Steam engine operates on_________________?
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A. Stirling cycle

B. brayton cycle

C. carnot cycle

D. joule cycle

E. none of the above

3368. One kilowatt-hour energy is equivalent to ________________?
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A. 1000 J

B. 3600 kW/sec

C. 3600 kJ

D. 360 kJ

E. 1000 kJ

3369. The critical pressure at which latent heat of vaporisation is zero is________________?
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A. 1 kgf/cm2

B. 1 kgf/cm2

C. 100 kgf/cm2

D. 273 kgf/cm2

E. 225.65 kgf/cm2

3370. The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________?
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A. 1.75 to 2.75 m

B. 2.25 to 4.5 m

C. 2 to 4 m

D. 1 to 1.75 m

E. 1 tp 1.25m

3371. The lenght of Cornish boiler is of the order of _________________?
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A. 5-7.5 m

B. 3-5 m

C. 7-9 m

D. 2-4 m

E. 9-11 m

3372. Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________?
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A. axial flow pump

B. gear pump

C. reciprocating pump

D. ejector pump

E. centrifugal pump

3373. In natural circulation type boiler _______________?
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A. feed pump is employed to supplement natural circulation in water wall type furnace

B. water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

C. water is fed at atmospheric pressure

D. water is converted into steam in one . pass without any recirculation

E. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

3374. Which of the following coals has the highest calorific value_________________?
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A. wood

B. anthracite coal

C. lignite

D. peat

E. bituminous coal

3375. Hygrometery deals with the_________________?
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A. density measurement

B. pressure of air

C. temperature of air

D. water vapour in air

E. Hygroscopic substances