1) What is the disadvantage of natural draught?
a. it has less life
b. it has more maintenance cost of cleaning and more capital cost to build the chimney
c. the available draught decreases with increasing outside air temperature
d. all of the above
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Answer
Explanation
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ANSWER: the available draught decreases with increasing outside air temperature
Explanation:
No explanation is available for this question!
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2) The formation of scale boiler leads to
a. decrease in efficiency of boiler
b. increase in efficiency of boiler
c. increase in heat transfer
d. decrease in maintenance of boiler
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Answer
Explanation
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ANSWER: decrease in efficiency of boiler
Explanation:
No explanation is available for this question!
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3) What is the pH value of water permissible for boiler?
a. 0
b. 7
c. slightly less than 7
d. slightly more than 7
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Answer
Explanation
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ANSWER: slightly more than 7
Explanation:
No explanation is available for this question!
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4) Which device used to separate condensate from the steam without letting steam escape?
a. condenser
b. steam valve
c. steam trap
d. none of the above
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Answer
Explanation
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ANSWER: steam trap
Explanation:
No explanation is available for this question!
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5) The natural draught in the steam generator depends upon
a. the air condition outside the chimney
b. the temperature of exhaust gases
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: both a. and b.
Explanation:
No explanation is available for this question!
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6) The purpose of superheater in a boiler is
a. to increase the temperature of saturated steam with increase in its pressure
b. to increase the temperature of saturated steam without increase in its pressure
c. to increase the temperature of feedwater for better efficiency
d. none of the above
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Answer
Explanation
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ANSWER: to increase the temperature of saturated steam without increase in its pressure
Explanation:
No explanation is available for this question!
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7) How is the natural draught produced for exhaust gases?
a. by using fan
b. by using chimney
c. by using gravity
d. none of the above
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Answer
Explanation
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ANSWER: by using chimney
Explanation:
No explanation is available for this question!
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8) What is the purpose of using economizer in the boiler?
a. to heat feedwater by utilizing heat from exhaust gases
b. to heat feedwater by utilizing some heat from superheated steam
c. to superheat steam
d. none of the above
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Answer
Explanation
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ANSWER: to heat feedwater by utilizing heat from exhaust gases
Explanation:
No explanation is available for this question!
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9) Comparing fire tube and water tube boilers, which boiler can produce comparatively higher pressure steam than another for the same capacity?
a. fire tube boiler
b. water tube boiler
c. both can produce steam at same pressure for the same capacity
d. none of the above
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Answer
Explanation
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ANSWER: water tube boiler
Explanation:
No explanation is available for this question!
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10) The boiler in which the tubes are surrounded by hot gases is called as
a. fire tube boiler
b. water tube boiler
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: water tube boiler
Explanation:
No explanation is available for this question!
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