Power Systems - I Mid - II, April - 2012

1.Annual load factor is determined from _______ load curve
  • daily
  • monthly
  • annual
  • none of the above
Answer: C
2.The value of load factor is
  • always greater than 1
  • always less than 1
  • equal to 1
  • may be less than or greater than 1
Answer: B
3.The annual ________ cost is due to the annual cost of fuel, oil, taxation, wages &salaries to the operating staff
  • running
  • fixed
  • semi-fixed
  • none
Answer: A
4.Which of the following is not a type of power factor tariff?
  • KVA maximum demand tariff
  • KW & KVAR tariff
  • flat rate tariff
  • sliding scale tariff
Answer: C
5.The maximum value of power factor can be
  • 1
  • 0.5
  • 0.9
  • 0.3
Answer: A
6.Majority of distribution sub-stations are of _______ type
  • pole-mounted
  • indoor
  • outdoor
  • underground
Answer: A
7.Power factor correction substations are generally located at the ________ of transmission line
  • sending end
  • receiving end
  • midpoint
  • none of these
Answer: B
8.In an interconnected grid system, the diversity factor of the whole system ________
  • decreases
  • remains constant
  • increases
  • increases and then decreases
Answer: C
9.As the load factor approaches unity, the shape of load duration curve will be nearly
  • L shaped
  • inverted T shaped
  • triangular
  • rectangular.
Answer: D
10.In a 440 V system, in order to obtain the minimum cost and maximum benefits, the capacitor should be installed
  • at the load
  • near the transformer
  • any where in the circuit
  • near the earthling point.
Answer: A
11.The area under the daily load curve gives ________________.
Answer: units generated in the day
12.The value of demand factor is _________ than 1.
Answer: less
13.The maximum demand on a power station is 100 MW. If the annual load factor is 40% , the total energy generated in a year is _______________
Answer: 3504 * 10^5 KWH
14.The number of units generated will be more if the load factor is _________.
Answer: more
15.KVAR = ____________ tanф.
Answer: KW
16.The tariff in which power factor of the consumer’s load is taken into consideration is known as __________________.
Answer: power factor tariff
17.Most of the sub-stations in the power system change _______________ of electric supply.
Answer: voltage level
18.The possibility of fault escalation is _______ in outdoor substation than that of indoor substation.
Answer: less
19.The principle cause of voltage variation is the change of ________ on the system.
Answer: load
20.The p.f of an a.c circuit is given by __________ power divided by __________ power.
Answer: active , apparent