For the induced draught the fan is located_______________?

Pipes carrying steam are generally made up of_____________?

A. steel
B. cast iron
C. copper
D. aluminium

Secondary air is the air used to______________?

A. reduce the flame length
B. increase the flame length
C. transport and dry the coal
D. provide air round the burners for getting optimum combustion

Blowing down of boiler water is the process_____________?

A. to reduce the boiler pressure
B. to increase the steam temperature
C. to control the solid concentration in the boiler water by removing some of the concentrated saline water
D. none of the above

One kilowatt hour is equal to_________?

A. 532 k cal.
B. 735 k cal.
C. 746 k cal.
D. 860 k cal.

Artificial draught is produced by____________?

A. air fans
B. steam jet
C. fan or steam jet
D. all of the above

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