1) 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
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2) 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
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3) 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
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4) 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
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5) 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
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6) In an interconnected system, the diversity factor of the whole system: a. remains unchanged b. decreases c. increases d. none of the above
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7) __________ will be least affected due to charge in supply voltage frequency. a. Electric clock b. Mixer grinder c. Ceiling fan d. Room heater
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8) 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
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9) For a diesel generating station the useful life is expected to be around_________Years? a. 15 to 20 years b. 20 to 50 years c. 50 to 75 years d. 75 to 100 years
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10) 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
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11) Which of the following source of power is least reliable? a. Solar energy b. Geothermal power c. Wind power d. iMHD
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12) An over excited synchronous motor on no load is known as__________? a. synchronous condenser b. generator c. induction motor d. alternator
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13) Which of the following plants is almost inevitably used as base load plant? a. Diesel engine plant b. Gas turbine plant c. Nuclear power plant d. Pumped storage plant
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14) Which of the following component, in a steam power plant, needs maximum maintenance attention? a. Steam turbine b. Condenser c. Water treatment plant d. Boiler
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15) The effect of electric shock on human body depends on which of the following? a. current b. voltage c. duration of contact d. all of the above
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16) Which of the following devices may be used to provide protection against lightening over voltages? a. Horn gaps b. Rod gaps c. Surge absorbers d. All of the above
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17) Load shedding is possible through which of the following? a. Switching of the loads b. Frequency reduction c. Voltage reduction d. Any of the above
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18) The knowledge of diversity factor helps in determining__________? a. plant capacity b. average load c. peak load d. kWh generated
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