Power System - I (3140914) MCQs

MCQs of Substations

Showing 71 to 80 out of 103 Questions
5 6 7 8 9 10
71.
Aluminum is preferred for switchgear installation over copper due to
(a) Higher conductivity
(b) Low cost for same current carrying capacity
(c) Excellent corrosion resistance
(d) All of above
Answer:

Option (d)

72.
In substations, the bus bars are painted or coated with enamel paints
(a) To indicate different phases in three phase systems
(b) To indicate positive and negative in DC system
(c) To reduce the effective cooling
(d) Both (a) and (b)
Answer:

Option (d)

73.
Hollow busbar conductors are used instead of solid busbar conductors
(a) To reduce skin effect
(b) To reduce proximity effect
(c) To reduce ferranti effect
(d) All of above
Answer:

Option (a)

74.
The busbar conductors are supported by
(a) Pin type insulators
(b) Post type insulators
(c) Strain type insulators
(d) Both (b) and (c)
Answer:

Option (d)

75.
______ combines the function of isolators and a switch.
(a) Circuit breaker
(b) Load interrupter switch
(c) Earth switch
(d) Line trap unit
Answer:

Option (b)

76.
Earth switch is connected between
(a) Line and earth
(b) Two lines
(c) Line and neutral
(d) circuit breaker and isolators
Answer:

Option (a)

77.
Which of the following is normally open in substations?
(a) Circuit breaker
(b) Earth switch
(c) Isolator
(d) None of above
Answer:

Option (b)

78.
Power transformers are designed to have maximum efficiency at
(a) Full load
(b) 50% of full load
(c) 80% of full load
(d) Any load
Answer:

Option (a)

79.
The voltage rating of the transformer in a pole mounted substation is
(a) 11 kV / 400 V
(b) 11 kV / 230 V
(c) 33 kV / 400 V
(d) None of above
Answer:

Option (a)

80.
What is the voltage regulation of power transformer?
(a) 5 - 8%
(b) 6 - 10%
(c) 10 - 12%
(d) 10 - 15%
Answer:

Option (b)

Showing 71 to 80 out of 103 Questions
5 6 7 8 9 10