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Objective Economics of Power Generation Questions and Answers pdf

61.    ________ is invariably used for peak load
(a)    Nuclear power plant
(b)    Steam turbine plant
(c)    Pumped storage plant
(d)    None of the above
Ans: c

62.    Which of the following is not an operating cost ?
(a)     Maintenance cost
(b)     Fuel cost
(c)    Salaries of high officials
(d)    Salaries of operating staff
Ans:

63.    Which of the following is the essential requirement of peak load plant ?
(a)     It should run at high speed
(b)     It should produce high voltage
(c)    It should be small in size
(d)    It should be capable of starting quickly
Ans: d

64.    Large capacity generators are invariably
(a)     water cooled
(b)     natural air cooled
(c)    forced air cooled
(d)    hydrogen cooled
Ans: d

65.    By the use of which of the following power factor can be improved ?
(a) Phase advancers
(b) Synchronous compensators
(c) Static capacitors
(d) Any of the above
Ans: d

66.    An induction motor has relatively high power factor at
(a) rated r.p.m.
(b) no load
(c) 20 percent load
(d) near full load
(e) none of the above
Ans: d

67.    Which of the following is the disadvantage due to low power factor ?
(a)    Poor voltage regulation
(b)    Increased transmission losses
(c)    High cost of equipment for a given load
(d)    All of the above
Ans: d

68.    In a distribution system, in order to improve power factor, the synchronous capacitors are installed
(a)    at the receiving end
(b)    at the sending end
(c)    either (a) or (b)
(d)    none of the above
Ans: a

69.    Satic capacitors are rated in terms of
(a) kW
(b) kWh
(e) kVAR
(d) none of the above
Ans: c

70.    Which of the following is the disadvantage of a synchronous condenser ?
(a)    High maintenance cost
(b)    Continuous losses in motor
(c)    Noise
(d)    All of the above
Ans: d


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