Mechanical Engineering - Steam Boilers and Engines

46. 

Cut-off governing of steam engines is a method of controlling the engine output by varying

A. volume of intake steam
B. pressure of intake steam
C. temperature of intake steam
D. all of these

Answer: Option A

Explanation:

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47. 

In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

A. 56%
B. 63%
C. 74%
D. 78%

Answer: Option B

Explanation:

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48. 

A safety valve mainly used with locomotive and marine boilers is

A. lever safety valve
B. dead weight safety valve
C. high steam and low water safety valve
D. spring loaded safety valve

Answer: Option D

Explanation:

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49. 

Which of the following boiler is best suited to meet the fluctuating demand of steam ?

A. Locomotive boiler
B. Lancashire boiler
C. Cornish boiler
D. Babcock and Wilcox boiler

Answer: Option A

Explanation:

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50. 

Which of the following statement is correct ?

A. Lancashire boiler is a fire tube boiler.
B. Fire tube boilers are internally fired.
C. Babcock and Wilcox boiler is a water tube boiler.
D. all of the above

Answer: Option D

Explanation:

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