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steam boilers engines nozzles and turbines MCQs

Practise focused steam boilers engines nozzles and turbines questions with marked answers for exam preparation and subject revision.

steam boilers engines nozzles and turbines Mcqs
1. For water, at pressures below atmospheric___________________?
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A. melting point drops slightly and boiling point drops slightly

B. melting point rises slightly and boiling point drops markedly

C. melting point rises markedly and boiling point drops markedly

D. melting point drops slightly and boiling point drops markedly

E. none of the above

2. The function of injector used in small steam plants is to________________?
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A. control steam temperature by injecting water

B. dose chemicals in feed water

C. create vacuum in furnace

D. create vacuum at turbine exhaust

E. pump feed water
3. The diameter of fire tube of Cornish boiler compared to its shell is__________________?
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A. three-fifth

B. one-fifth

C. two-fifth

D. one third

E. one half
4. Hard coke is produced by carborisation of coal at_______________?
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A. 120O-1500C

B. 70O-850C

C. 95O-1100C

D. atmospheric temperature

E. 500-600C

5. Which of the following is a water tube boiler_________________?
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A. Cochran boiler

B. locomotive boiler

C. Lancashire boiler

D. Cornish boiler

E. Babcock and Wilcox boiler
6. Hard coke is used in________________?
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A. cement industry

B. locomotives

C. blast furnace

D. thermal power plant

E. domestic use

7. Lancashire boiler is a__________________?
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A. water tube boiler with natural/forced circulation

B. none of the above

C. stationary fire tube boiler

D. mobile fire tube boiler

E. stationary water tube boiler

8. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?
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A. curved line

B. vertical straight line

C. none of the above

D. straight inclined line

E. horizontal straight line
9. Latent heat of dry steam at atmospneric pressure is equal to____________________?
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A. 100 kcal/kg

B. 427 kcal/kg

C. 539 BTU/lb

D. 471 kcal/kg

E. 539 kcal/kg
10. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?
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A. 40%

B. 50%

C. 80%

D. 90%

E. 25%

11. Heating wet steam at constant temperature is heating it at constant_________________?
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A. enthalpy

B. pressure

C. none of the above

D. entropy

E. volume

12. At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?
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A. 0K.

B. 300K

C. 373K

D. 273.16K

E. 303K

13. 100% efficiency of a thermal cycle cannot be achieved because of __________________?
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A. non-availability of ideal substance

B. frictional losses

C. it is not possible to achieve 0K temperature

D. leakage

E. none of the above

14. The saturation temperature of steam with increase in pressure increases____________________?
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A. linearly

B. inversely

C. slowly first and then rapidly

D. rapidly first and then slowly

E. none of the above

15. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are________________?
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A. none of the above

B. supplied by same manufacturer loose and assembled at site

C. packaged boiler does not exist

D. supplied mounted on a single base

E. purchased from several parties and packed together at site

16. The specific volume of steam with increase in pressure decreases_____________________?
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A. slowly first and then rapidly

B. linearly

C. none of the above

D. rapidly first and then slowly

E. inversely

17. Which of the following gases has the highest calorific value ________________?
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A. producer gas

B. coal gas

C. blast furnace gas

D. coke oven gas

E. water gas

18. The water tubes in a babcock and wilcox boiler are__________________?
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A. vertical

B. horizontal

C. horizontal and inclined

D. inclined

E. vertical and inclined

19. The shell diameter and length of locomotive boiler are_______________?
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A. 1.5 m, 8 m

B. 1.5 m, 4 m

C. 2 m, 4 m

D. 1 m, 4 m

E. 1.5 m, 6 m

20. Which of the following varieties of coals is mostly used in steam boilers____________________?
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A. peat

B. non-coking bituminous coal

C. none of the above

D. brown coal

E. coking bituminous coal