631. Evaporative type of condenser has___________?
A. steam in pipes surrounded by water
B. water in pipes surrounded by steam
C. either A. or (b)
D. none of the above

632. Pipes carrying steam are generally made up of_____________?
A. steel
B. cast iron
C. copper
D. aluminium

633. For the safety of a steam boiler the number of safety valves fitted are____________?
A. four
B. three
C. two
D. one

634. Steam turbines commonly used in steam power station are__________?
A. condensing type
B. non-condensing type
C. none of the above

635. Belt conveyer can be used to transport coal at inclinations upto____________?
A. 30°
B. 60°
C. 80°
D. 90°

636. The maximum length of a screw conveyer is about___________?
A. 30 metres
B. 40 metres
C. 60 metres
D. 100 metres

637. The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?
A. 25 to 30%
B. 40 to 50%
C. 65 to 70%
D. 85 to 90%

638. Load center in a power station is___________?
A. center of coal fields
B. center of maximum load of equipments
C. center of gravity of electrical system

639. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
A. 20 kgf/cm2
B. 50 kgf/cm2
C. 100 kgf/cm2
D. 150 kgf/cm2

640. Economisers improve boiler efficiency by__________?
A. 1 to 5%
B. 4 to 10%
C. 10 to 12%

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