Power system MCQ #5

Power system MCQ 76 to 80:

76) What happens during the Ferranti effect?

      (a) Receiving end current becomes more than sending end current

      (b) Receiving end power becomes more than sending end power

      (c) Receiving end voltage becomes more than sending end voltage

      (d) Receiving end frequency becomes more than sending end frequency

77) The most suitable location for the power factor improvement device is

      (a) At the receiving end in case of transmission lines.

      (b) At the sending end.

      (c) Near the electrical appliance which is responsible for the poor power factor.

      (d) Both (a) and (c).

78) What does the annual fixed cost include?

      (a) Interest, taxes, insurance and depreciation

      (b) Fuel, maintenance cost and labour

      (c) Both (a) and (b)

      (d) None of the above

79) Ferranti effect is not a problem for ________

      (a) Transmission line having high capacitance

      (b) Medium Transmission lines

      (c) Long Transmission lines

      (d) Short Transmission lines

80) _____________ equipment or element can reduce Ferranti effect?

      (a) Current limiting reactors

      (b) Circuit Breaker

      (c) Relay

      (d) Resistors

ANSWER: | 76-c | 77-d | 78-a | 79-d | 80-a |

Power system MCQ 81 to 85:

81) The main drawback of overhead system over underground system is-

      (a) Surge problem

      (b) Higher charging current

      (c) Underground system is more flexible than overhead system

      (d) High initial cost

82) Transmission line connects-

      (a) Step down transformer station to service transformer banks

      (b) Service points to consumer premises

      (c) Distribution transformer to consumer premises

      (d) Generating station to a switching station

83) Corona is-

      (a) Complete breakdown of air

      (b) Partial breakdown of air

      (c) Sparking between lines

      (d) None of these

84) Bundled conductors reduce

      (a) Decrease the line capacitance

      (b) Increases the line reactance

      (c) Surface electric stress of conductor

      (d) All

85) Why is load shedding done?

      (a) Efficient operation of equipment.

      (b) Repairing of machines.

      (c) Reducing peak demand on the system.

      (d) Power factor improvement.

ANSWER: | 81-a | 82-d | 83-a | 84-c | 85-c |

Power system MCQ 86 to 90:

86) For a nuclear plant, what is its useful life?

      (a) 10 years.

      (b) 30 years

      (c) 60 years

      (d) 100 years

87) In a steam power station, electric power is generated at what power?

      (a) 33 kV

      (b) 1.1 kV

      (c) 11 kV

      (d) 440 V

88) Which among the following plants have the least operating cost?

      (a) Steam plants

      (b) Diesel plants

      (c) Hydro plants

      (d) Nuclear plants

89) Utilisation factor is the ratio of

      (a) Average demand to the rated capacity of the plant.

      (b) Rated capacity of the power plant to the maximum demand.

      (c) Maximum demand on the power plant to the rated capacity of the power plant.

      (d) None of these

90) What is the result of the product of diversity factor and maximum demand?

      (a) Average demand

      (b) Generated power

      (c) Installed capacity

      (d) Sum of consumers maximum demand

ANSWER: | 86-b | 87-c | 88-c | 89-c | 90-d |