A. 25 to 30%
B. 40 to 50%
C. 65 to 70%
D. 85 to 90%
Related Mcqs:
- Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?
A. underfeed stoker
B. overfeed stoker
C. any - Economisers improve boiler efficiency by__________?
A. 1 to 5%
B. 4 to 10%
C. 10 to 12% - The overall efficiency of a steam power station is ________ its thermal efficiency.
A. less than
B. equal to
C. greater than
D. none 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 - For the safety of a steam boiler the number of safety valves fitted are____________?
A. four
B. three
C. two
D. one - 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 - Belt conveyer can be used to transport coal at inclinations upto____________?
A. 30°
B. 60°
C. 80°
D. 90° - In coal preparation plant, magnetic separators are used to remove___________?
A. dust
B. clinkers
C. iron particles
D. sand - Method which is commonly applied for unloading the coal for small power plant is___________?
A. lift trucks
B. coal accelerators
C. tower cranes
D. belt conveyor - The overall efficiency of thermal power plant is equal to____________?
A. Rankine cycle efficiency
B. Carnot cycle efficiency
C. Regenerative cycle efficiency
D. Boiler efficiency x turbine efficiency x generator efficiency
