Steam Boilers - Interview Questions | Exam2Win

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96. In ordered obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

A. remain unaffected

B. improve

C. worsen

D. may improve/worsen depending on size

E. unpredictable.

Explanation:

97. The balanced draft furnace is one using

A. induced draft fan and chimney

B. induced draft fan and forced draft fan

C. forced draft fan and chimney

D. any one of the above

E. none of the above.

Explanation:

98. De aeration of feed water is carried out because it reduces

A. cavitation of .boiler feed pumps

B. corrosion caused by oxygen

C. heat transfer coefficient

D. pH value of water

E. weight of water to be handled.

Explanation:

99. The feed check valve is used in order to

A. regulate flow of boiler water

B. check level of water in boiler drum

C. recirculate unwanted feed water

D. allow high pressure feed water to flow to drum and not allow reverse flow to take place

E. none of the above.

Explanation:

100. During storage, the heating value of coal

A. increases

B. decreases

C. remains constant

D. may increase or decrease depending upon the method of storage

E. none of the above.

Explanation: