Transmission and Distribution MCQs | Transmission and Distribution Multiple Choice Questions with Answers

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Questions
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
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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

Answer: 40 to 60 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

Answer: Unstranded 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

Answer: Decreases
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

Answer: Ring 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

Answer: Reduce reactance
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