100 TOP Power Plant Engineering Multiple choice Questions and Answers pdf

81.    Economisers improve boiler efficiency by
(a) 1 to 5%
(b) 4 to 10%
(c) 10 to 12%
Ans: b

82.    The capacity of large turbo-generators varies from
(a) 20 to 100 MW
(b) 50 to 300 MW
(c) 70 to 400 MW
(d) 100 to 650 MW
Ans: b

83.    Caking coals are those which
(a)     burn completely
(b)     burn freely
(c)    do not form ash
(d)    form lumps or masses of coke
Ans: d

84.    Primary air is that air which is used to
(a)     reduce the flame length
(b)     increase the flame length
(c)    transport and dry the coal
(d)    provide air around burners for get¬ting optimum combustion
Ans: c

85.    Secondary air is the air used to
(a) reduce the flame length
(b) increase the flame length
(c) transport and dry the coal
(d) provide air round the burners for getting optimum combustion
Ans: d

86.    In coal preparation plant, magnetic separators are used to remove
(a) dust
(b) clinkers
(c) iron particles 
(d) sand
Ans: c

87.    Load carrying capacity of belt conveyor is about
(a)     20 to 40 tonnes/hr
(b)     50 to 100 tonnes/hr
(c)    100 to 150 tonnes/hr
(d)    150 to 200 tonnes/hr
Ans: b

88.    Method which is commonly applied for unloading the coal for small power plant is
(a) lift trucks
(b) coal accelerators
(c) tower cranes  
(d) belt conveyor
Ans: b

89.    Bucket elevators are used for
(a)    carrying coal in horizontal direction
(b)    carrying coal in vertical direction          
(c)     carrying coal in any direction
Ans: b

90.    The amount of air which is supplied for complete combustion is called
(a) primary air   
(b) secondary air
(c) tertiary air
Ans: b

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