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

Related Mcqs:

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
The draught which a chimney produces is called_____________?
A. induced draught
B. natural draught
C. forced draught
D. balanced draught
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
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
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
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
Artificial draught is produced by______________?
A. induced fan
B. forced fan
C. induced and forced fan
D. all of the above
Artificial draught is produced by____________?
A. air fans
B. steam jet
C. fan or steam jet
D. all of the above
The artificial draught normally is designed to produce____________?
A. less smoke
B. more draught
C. less chimney gas temperature
D. all of the above
For the induced draught the fan is located_______________?
A. near bottom of chimney
B. near bottom of furnace
C. at the top of the chimney
D. anywhere permissible