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Q21
A direct voltage is applied to a peak diode voltmeter in which scale is calibrated to read rms voltage of a sine wave. If the meter reading is 36 V rms, the value of the applied direct voltage is
  • A 25 V
  • B 36 V
  • C 51 V
  • D 72 V.
Answer: Option C
Q22
A power station has annual load factor of 50% and capacity factor of 40%. If the maximum demand is 15 MW, the reserve capacity of the plant is
  • A 1250 kw
  • B 2500 kw
  • C 3750 kw
  • D 4750 kw.
Answer: Option C
Q23
Which of the following will not contribute to low power-factor ?
  • A Partially loaded induction motors
  • B Replacement of fluorescent lamps with incandescent lamps
  • C Use of rectifiers instead of synchronous motor-generator sets for dc power supply
  • D Increased installation of electronic equipments, air- conditioning units, etc.
Answer: Option B
Q24
Which of the following may not be the effect of low plant operating power factor ?
  • A Over loaded transformers
  • B Reduced voltage level
  • C Improved illumination from lighting
  • D Over loaded cables.
Answer: Option C
Q25
Identify the incorrect relation
  • A power factor = KW / kVA
  • B kW = kVA x power factor
  • C kVA x kW = power factor
  • D kVA = kW / power factor.
Answer: Option C
Q26
The power factor of a system on a 460 V, 3 phase, 60 Hz, in which the ammeter indicates 100 amp and the watt meter reads 62 kW will be
  • A 0.95
  • B 0.78
  • C 0.65
  • D 0.55.
Answer: Option B
Q27
When a power plant is not able to meet the demand of consumers it will resort to
  • A penalizing high load consumers by increasing the charges for electricity
  • B power factor improvement at the generators
  • C efficient plant operation
  • D load shedding.
Answer: Option D
Q28
Load shedding is possible through
  • A voltage reduction
  • B frequency reduction
  • C switching off the loads
  • D any of the above.
Answer: Option D
Q29
Which of the following power plants can generate power at unpredictable or uncontrollable times ?
  • A Wind power plant
  • B Tidal power plant
  • C Solar power plant
  • D Any of the above.
Answer: Option D
Q30
Direct conversion of heat into electrical power is possible through
  • A thermionic converter
  • B fuel cell
  • C batteries
  • D all of the above.
Answer: Option A

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