Mechanical Engineering Objective Questions { Power Plant Engineering }

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50. Efficiency of rankine cycle can be increased by

A. Decreasing initial steam pressure and temperature

B. Increasing exhaust pressure

C. Decreasing exhaust pressure

D. Increasing the expansion ratio

51. Cochran boiler is a

A. Horizontal fire-tube boiler

B. Horizontal water-tube boiler

C. Veritcal water-tube boiler

D. Vertical fire tube boiler

52. Lancashire boiler is a

A. Stationary fire tube boiler

B. Stationary water tube boiler

C. Water tube boiler with natural/forced circulation

D. Mobile fire tube boiler

53. Efficiency of a thermal cycle increases by

A. Regeneration

B. Reheating of steam

C. Both (a) and (b)

D. Cooling,of steam

54. Which of the following gases has the highest calorific value

A. Producer gas

D. Blast furnace gas

55. 100% efficiency of a thermal cycle cannot be achieved because of

A. Frictional losses

B. It is not possible to achieve 0°K temperature

D. Non-availability of ideal substance

56. For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is

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