651. Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?
A. anthracite
B. lignite
C. semibituminous and bituminous

652. Example of overfeed type stoker is___________?
A. chain grate
B. spreader
C. travelling grate
D. all of the above

653. 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

654. 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

655. 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

656. Deaerative heating is done to_____________?
Deaerative heating is done to
A. heat the water
B. heat the air in the water
C. remove dissolved gases in the water

657. Reheat factor is the ratio of_____________?
A. isentropic heat drop to useful heat drop
B. adiabatic heat drop to isentropic heat drop
C. cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

658. 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

659. 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

660. 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 

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