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Free download in PDF Transmission and Distribution Multiple Choice Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
61
Insulation resistance of a cable decreases with
[A]
Increases in the length of the insulation of cable
[B]
Decreases in the length of the insulation of cable
[C]
Increases in electric stress
[D]
Increases in temperature
Answer: Increases in the length of the insulation of cable
62
Size of the earth wire is determined by
[A]
The ampere capacity of the service
[B]
The voltage of the service wires
[C]
The atmospheric conditions
[D]
None of these
Answer: The ampere capacity of the service
63
As per Indian Standards, the cross-sectional area of the neutral wire in a 3-phase 4 wire system is
[A]
One-fourth that of a phase conductor
[B]
Half that of a phase conductor
[C]
Equal to that of a phase conductor
[D]
Twice that of a phase conductor
Answer: One-fourth that of a phase conductor
64
The characteristic impedance of a lossless cable is typically
[A]
40 to 60 Ω
[B]
100 to 120 Ω
[C]
400 to 600 Ω
[D]
1000 to 1500 Ω
65
Visual corona takes place in parallel wires at a voltage
[A]
Higher than disruptive critical voltage
[B]
Higher than Curie voltage
[C]
Equal to disruptive voltage
[D]
None of these
Answer: Higher than disruptive critical voltage
66
Corona loss is maximum when using
[A]
ACSR
[B]
Unstranded wire
[C]
Stranded wire
[D]
Transposed wire
67
If fault occurs near an impedance relay, the V I ratio is
[A]
Constant for all the locations of fault
[B]
Lower than the value if fault occurs away from the relay
[C]
Higher than the value if fault occurs away from the relay
[D]
May be lower or higher than the value if fault occurs away from the relay
Answer: Lower than the value if fault occurs away from the relay
68
The fault MVA is given by
[A]
(Base MVA)/(P.U.Xeq)
[B]
Base MVA × P.U. Xeq
[C]
(Base MVA)/((P.U.Xeq)2 )
[D]
None of these
Answer: (Base MVA)/(P.U.Xeq)
69
During rains, the direct capacitance of suspension type insulator
[A]
Increases
[B]
Decreases
[C]
Remain unchanged
[D]
May increase or decrease
70
Guy is attached to a transmission line pole to
[A]
Reduce the sag
[B]
Hold the telephone lines
[C]
Strengthen the pole
[D]
None of these
Answer: Strengthen the pole
71
To increases the power transmitting capacity of a transmission line we
[A]
Increases its line capacitance
[B]
Increases its line inductance
[C]
Decreases its line capacitance
[D]
All of these
Answer: Increases its line capacitance
72
For a power system, to be stable, the phase constant β of its transmission line should be
[A]
(RL RO)/(RO +RL )
[B]
(RL -RO)/(RL +RO )
[C]
(RL +RO)/(RL -RO )
[D]
(RL RO)/(RO RL )
Answer: (RL -RO)/(RL +RO )
73
In a transmission line, the shunt conductance results due to
[A]
Short circuiting of line by the load
[B]
Leakage over the insulator
[C]
Radial over the insulator
[D]
Axial current in the conductor
Answer: Leakage over the insulator
74
Any voltage surge travelling on the transmission line first enters
[A]
Step down transformer
[B]
Over voltage relay
[C]
Switch gear
[D]
Lightning arrestor
Answer: Lightning arrestor
75
The sag of a transmission line is affected by
[A]
Its own weight and weight of the ice formed
[B]
Temperature and wind condition
[C]
Both (a) and (b) above
[D]
None of these
Answer: Both (a) and (b) above
76
Which of the following system is preferred for good efficiency and high economy in distribution system?
[A]
Single phase system
[B]
2 phase 3 wire system
[C]
3 phase 3 wire system
[D]
3 phase 4 wire system
Answer: 3 phase 3 wire system
77
Breakdown of insulation of a cable can be avoided economically by the use of
[A]
Insulating material with different dielectric
[B]
Intersheath
[C]
Both (a) and (b) above
[D]
None of these
Answer: Both (a) and (b) above
78
For most reliable distribution supply, the configuration used is
[A]
Radial main
[B]
Ring main
[C]
Parabolic main
[D]
Balancing main
79
ACSR is used for transmission of power in preference to copper conductors because
[A]
It is lighter
[B]
It is more economical
[C]
It has higher current carrying capacity
[D]
It can stand higher surge voltages
Answer: It is more economical
80
Bundled conductors are used to
[A]
Reduce radio interference
[B]
Reduce reactance
[C]
Both (a) and (b)
[D]
All of these
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