Primary air is that air which is used to_____________?
(A) reduce the flame length
(B) increase the flame length
(C) transport and dry the coal
(D) provide air around burners for get¬ting optimum combustion
Caking coals are those which__________?
(A) burn completely
(B) burn freely
(C) do not form ash
(D) form lumps or masses of coke
The capacity of large turbo-generators varies from___________?
(A) 20 to 100 MW
(B) 50 to 300 MW
(C) 70 to 400 MW
(D) 100 to 650 MW
At low value of power factor, the cost of generation of a power station will be____________?
(A) high
(B) low
(C) remain same
(D) none of the above
Compounding of steam turbine is done for_______________?
(A) reducing the work done
(B) increasing the rotor speed
(C) reducing the rotor speed
(D) balancing the turbine
The value of the reheat factor is of the order of_____________?
(A) 0.8 to 1.0
(B) 1.0 to 1.05
(C) 1.1 to 1.5
(D) above 1.5
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
TravelUng grate stoker can burn coals at the rates of____________?
(A) 50—75 kg/m per hour
(B) 75—100 kg/m per hour
(C) 100—150 kg/m per hour
(D) 150—200 kg/m2 per hour
Example of overfeed type stoker is___________?
(A) chain grate
(B) spreader
(C) travelling grate
(D) all of the above
In thermal power plant, heat from the flue gases is utilized in___________?
(A) super heater
(B) condenser
(C) economizer
(D) chimney