steam boilers engines nozzles and turbines MCQs – Page 2

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
21. The biggest size of thermal power unit operating in India is ________________?
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A. 60 MW

B. 100 MW

C. 500 MW

D. 210 MW

E. 30 MW

22. The fire tubes in, a Coarran and Scotish marine boiler are_________________?
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A. horizontal

B. vertical

C. inclined

D. both horizontal and vertical

E. horizontal and inclined

23. Efficiency of a thermal cycle increases by ________________?
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A. regeneration

B. reheating of steam

C. both A. and B.

D. cooling of steam

E. none of the above

24. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is___________________?
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A. same

B. could be more or less depending on other factors

C. none of the above

D. more

E. less

25. Which of the following is steam dbal?
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A. non-coking bituminous coal

B. pulverised coal

C. none of the above

D. coking bituminous coal

E. brown coal

26. The specific heat of superheated steam in kcal/kg is generally of the order of___________________?
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A. 0.1

B. 0.5

C. 1

D. 0.8

E. 0.3

27. Superheating of steam is done at_________________?
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A. constant pressure

B. constant entropy

C. constant enthaply

D. constant volume

E. constant temperature

28. Mechanical equivalent of heat for 1 kcal or Joules equivalent is equal to_________________?
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A. 102 kgm

B. 75 kgm

C. 539 kgm

D. 421 kgm

E. 421 kgm
29. The diameters of fire tubes and superheaer tubes in locomotive boiler are_________________?
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A. 32.5 mm, 180 mm

B. 65.5 mm, 210 mm

C. 47.5 mm, 130 mm

D. 24.5 mm, 65 mm

30. During polytropic process_________________?
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A. steam may be wet, dry or superheated after expansion

B. work is done

C. none of the above

D. all of the above

E. heat transfer takes place across cylinder walls

31. The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?
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A. remain dry saturated

B. wet

C. none of the above

D. superheated

E. dry

32. Water boils when its vapour pressure ___________________?
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A. equals 760 mm of mercury

B. equals to atmospheric pressure

C. equals that of the surroundings

D. boiling has ^nothing to do with vapour pressure

E. equals the pressure of water in the container

33. A boiler in India should conform to safety regulations of__________________?
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A. BS

B. DIN

C. GOST

D. IBR

E. ASTM

34. In a throttling process_________________?
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A. internal energy of steam changes

B. all of the above

C. none of the above

D. work is done by the expanding steam

E. heat transfer takes place

35. Carbonation of coal is the process of________________________?
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A. heating wood in a limited supply of air at temperatures below 300C

B. binding the pulverised coal into brick-ettes

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. enriching carbon in the coal

E. pulverising coal in inert atmosphere

36. Pick up the correct statement as regards Cornish boiler and Lancashire boiler _______________?
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A. cornish is fire tube and lancashire is water tube

B. cornish is water tube and lancashire is fire tube

C. cornish has two fire tubes and lancashire has one

D. lancashire has two fire tubes and cornish has one

E. both have two fire tubes

37. Efficiency of rankine cycle can be increased by_________________?
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A. decreasing exhaust pressure

B. increasing number of regenerative heaters

C. decreasing initial steam pressure and temperature

D. increasing exhaust pressure

E. increasing the expansion ratio

38. The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?
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A. 1.5 to 2 kg

B. 0.2 to 0.4 kg

C. 1.0 to 1.5 kg

D. 0.6 to 0.8 kg

E. 0.1 to 0.2 kg

39. Coke is produced by__________________?
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A. enriching carbon in the coal

B. pulverising coal in inert atmosphere

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. heating wood in a limited supply of air at temperatures below 300GC

E. binding the pulverised coal into brick-etts

40. Stoichiometric quantity of air is the___________________?
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A. air required for optimum combustion so as to have reasonable excess air

B. air present in atmosphere at NTP conditions

C. air required to convert CO into C02

D. air required to form an explosive mixture

E. air required for complete combustion of fuel with no excess air