Latest Power Plant Engineering Multiple choice Questions and Answers pdf

31.    The draught produced by steel chimney as compared to that produced by brick chimney for the same height is
(a) less
(b) more
(c) same
(d) may be more or less
Ans: b

32.    In a boiler installation the natural draught is produced
(a)    due to the fact that furnace gases being light go through the chimney giving place

to cold air from outside to rush in
(b)    due to the fact that pressure at the grate due to cold column is higher than the

pressure at the chimney base due to hot column
(c)    due to the fact that at the chimney top the pressure is more than its

environmental pressure
(d)    all of the above
Ans: b

33.    The draught produced, for a given height of the chimney and given mean temperature of chimney gases
(a)     decreases with increase in outside air temperature
(b)     increases with increase in outside air temperature
(c)    remains the same irrespective of outside air temperature
(d)    may increase or decrease with increase in outside air temperature
Ans: a

34.    The draught produced by chimney of given height at given outside temperature
(a)     decreases if the chimney gas temperature increases
(b)    increases if the chimney gas temperature increases
(c)    remains same irrespective of chimney gas temperature
(d)    may increase or decrease
Ans: b

35.    For forced draught system, the function of chimney is mainly
(a)     to produce draught to accelerate the combustion of fuel
(b)     to discharge gases high up in the atmosphere to avoid hazard
(c)    to reduce the temperature of the hot gases discharged
(d)    none of the above
Ans: b

36.    Artificial draught is produced by
(a)     induced fan
(b)     forced fan
(c)     induced and forced fan
(d)     all of the above
Ans: d

37.    The draught in locomotive boilers is produced by
(a)     forced fan
(b)     chimney
(c)     steam jet
(d)     only motion of locomotive
Ans: c

38.    For the same draught produced the power of induced draught fan as compared to forced draught fan is
(a)     less
(b)     more
(c)     same
(d)     not predictable
Ans: b

39.    Artificial draught is produced by
(a)     air fans
(b)     steam jet
(c)    fan or steam jet
(d)    all of the above
Ans: d

40.    The artificial draught normally is designed to produce
(a)     less smoke
(b)     more draught
(c)    less chimney gas temperature
(d)    all of the above
Ans: d

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