581. In a regenerative feed heating cycle, the greatest economy is affected___________?
A. when steam is extracted from only one suitable point of steam turbine
B. when steam is extracted from several places in different stages of steam turbine
C. when steam is extracted only from the last stage of steam turbine
D. when steam is extracted only from the first stage of steam turbine
582. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________?
A. increases with number of feed heaters increasing
B. decreases with number of feed heaters increasing
C. remains same unaffected by number of feed heaters
D. none of the above
583. In regenerative cycle feed water is heated by_____________?
A. exhaust gases
B. heaters
C. draining steam from the turbine
D. all above
584. Reheat cycle in steam power plant is used to________________?
A. utilise heat of flue gases
B. increase thermal efficiency
C. improve condenser performance
D. reduce loss of heat
585. Mercury is a choice with steam in binary vapour cycle because it has____________?
A. higher critical temperature and pressure
B. higher saturation temperature than other fluids
C. relatively low vapourisation pressure
D. all above
586. Binary vapour cycles are used to_____________?
A. increase the performance of the condenser
B. increase the efficiency of the plant
C. increase efficiency of the turbine
587. A steam power station requires space______________?
A. equal to diesel power station
B. more than diesel power station
C. less than diesel power station
588. Economizer is used to heat_____________?
A. air
B. feed water
C. flue gases
D. all above
589. The modern steam turbines are___________?
A. impulse turbines
B. reaction turbines
C. impulse-reaction turbines
D. none of the above
590. The draught which a chimney produces is called_____________?
A. induced draught
B. natural draught
C. forced draught
D. balanced draught
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