Power Plant Engineering Objective type Questions and Answers pdf

61.    Steam turbines are governed by the following methods
(a)    Throttle governing
(b)    Nozzle control governing
(c)    By-pass governing
(d)    all of the above
Ans: d

62.    In steam turbines the reheat factor
(a)     increases with the increase in number of stages
(b)     decreases with the increase in number of stages
(c)    remains same irrespective of num¬ber of stages
(d)    none of the above
Ans: a

63.    The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is
(a) higher
(b) lower
(c) same as long as initial pressure and temperature is unchanged
(d) none of the above
Ans: a

64.    In jet type condensers
(a)     cooling water passes through tubes and steam surrounds them
(b)     steam passes through tubes and cooling water surrounds them
(c)    steam and cooling water mix
(d)    steam and cooling water do not mix
Ans: c

65.    In a shell and tube surface condenser
(a) steam and cooling water mix to give the condensate
(b) cooling water passes through the tubes and steam surrounds them
(c) steam passes through the cooling tubes and cooling water surrounds them
(d) all of the above varying with situa¬tion
Ans: b

66.    In a surface condenser if air is removed, there is
(a)    fall in absolute pressure maintained in condenser
(b)    rise in absolute pressure maintained in condenser
(c)    no change in absolute pressure in the condenser
(d)    rise in temperature of condensed steam
Ans: a

67.    The cooling section in the surface condenser
(a)    increases the quantity of vapour extracted along with air
(b)    reduces the quantity of vapour extracted along with air
(c)    does not affect vapour quantity extracted but reduces pump capacity of air extraction pump
(d)    none of the above
Ans: b

68.   Edward's air pump
(a)    removes air and also vapour from condenser
(b)    removes only air from condenser
(c)    removes only un-condensed vapour from condenser
(d)     removes air alongwith vapour and also the condensed water from condenser
Ans: d

69.    In a steam power plant, the function of a condenser is
(a)     to maintain pressure below atmospheric to increase work output from the primemover
(b)     to receive large volumes of steam exhausted from steam prime mover
(c)    to condense large volumes of steam to water which may be used again in boiler
(d)    all of the above
Ans: d

70.    In a regenerative surface condenser
(a)     there is one pump to remove air and condensate
(b)     there are two pumps to remove air and condensate
(c)    there are three pumps to remove air, vapour and condensate
(d)    there is no pump, the condensate gets removed by gravity
Ans: b

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