100 TOP Economics of Power Generation Multiple choice Questions and Answers pdf

71.    For a consumer the most economical power factor is generally
(a) 0.5 lagging   
(b) 0.5 leading
(c) 0.95 lagging  
(d) 0.95 leading
Ans: c

72.    A synchronous condenser is virtually which of the following ?
(a)    Induction motor
(b)    Under excited synchronous motor
(c)    Over excited synchronous motor
(d)    D.C. generator
(e)     None of the above
Ans: c

73.    For a power plant which of the following constitutes running cost ?
(a)     Cost of wages
(b)     Cost of fuel
(c)    Cost of lubricants
(d)    All of the above
Ans: d

74.    In an interconnected system, the diversity factor of the whole system
(a)    remains unchanged
(b)    decreases
(c)     increases
(d)     none of the above
Ans: c

75.    Generators for peak load plants are usually designed for maximum efficiency at
(a)    25 to 50 percent full load
(b)    50 to 75 percent full load
(c)    full load
(d)    25 percent overload
Ans: b

76.    ________ will be least affected due to charge in supply voltage frequency.
(a) Electric clock
(b) Mixer grinder
(c) Ceiling fan
(d) Room heater
Ans: d

77.    The connected load of a IVMIM uir consumer is around
(a) 5 kW
(b) 40 k\V
(c) 80 kW
(d) 120 kW
Ans: a

78.    Which of the following is not necessarily an advantage of interconnecting various power stations ?
(a)    Improved frequency of power supplied
(b)    Reduction in total installed capacity
(c)    Increased reliability
(d)    Economy in operation of plants
Ans: a

79.    A power transformer is usually rated in
(a) kW
(b) kVAR
(c) kWh
(d) kVA
Ans: d

80.     public sector undertaking is associated with erection and sometimes running of thermal power plants
(a) NTPC
(b) SAIL
(c) BEL
(d) BHEL
Ans: a

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