Realtime Power Plant Engineering Multiple choice Questions and Answers pdf

21.    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
Ans: b

22.    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
Ans: a

23.    In regenerative cycle feed water is heated by
(a)     exhaust gases
(b)     heaters
(c)    draining steam from the turbine
(d)    all above
Ans: c

24.    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
Ans: b

25.    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
Ans: d

26.    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
Ans: b

27.    A steam power station requires space
(a)    equal to diesel power station
(b)    more than diesel power station
(c)    less than diesel power station
Ans: b

28.    Economiser is used to heat
(a)    air
(b)    feed water
(c)    flue gases
(d)    all above
Ans: b

29.    The modern steam turbines are
(a)    impulse turbines
(b)    reaction turbines
(c)    impulse-reaction turbines
(d)    none of the above
Ans: c

30.    The draught which a chimney produces is called
(a)     induced draught
(b)     natural draught
(c)    forced draught
(d)    balanced draught
Ans: b

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