100 TOP Objective Economics of Power Generation Questions and Answers pdf

81.    Most efficient plants are normally used as
(a) peak load plants
(b) base load plants
(c) either (a) or (b)
(d) none of the above
Ans:

82.    For a diesel generating station the useful life is expected to be around
(a) 15 to 20 years
(b) 20 to 50 years
(c) 50 to 75 years
(d) 75 to 100 years
Ans: a

83.    Which of the following is not a method for estimating depreciation charges ?
(a) Sinking fund method
(b) Straight line method
(c) Diminishing value method
(d) Halsey's 50—50 formula
Ans: d

84.    The expected useful life of an hydroelectric power station is around
(a) 15 years
(b) 30 years
(c) 60 years
(d) 100 years
Ans: d

85.    In a load curve the highest point represents
(a) peak demand
(b) average demand
(c) diversified demand
(d) none of the above
Ans: a

86.    Which of the following source of power is least reliable ?
(a) Solar energy
(b) Geothermal power
(c) Wind power  
(d) iMHD
Ans:

87.    In India production and distribution of electrical energy is confined to
(a)     private sector
(b)     public sector
(c)    government sectors
(d)    joint sector
(e)    none of the above
Ans: b

88.    A pilot exciter is provided on generators for which of the following reasons ?
(a)    To excite the poles of main exciter
(b)    To provide requisite starting torque to main exciter
(c)    To provide requisite starting torque to generator
(d)    None of the above
Ans: a

89.    The primary reason for low power factor is supply system is due to installation of
(a)    induction motors
(b)    synchronous motors
(c)    single phase motors
(d)     d.c. motors
Ans: a

90.    An over excited synchronous motor on noload is known as
(a)    synchronous condenser
(b)    generator
(c)     induction motor
(d)    alternator
Ans: a

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