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Transmission and Distribution MCQs | Transmission and Distribution Short Questions and Answers

41 The topmost wire in a distribution line is
[A] Phase wire
[B] Earth wire
[C] Neutral wire
[D] Any of these
Answer: Earth wire
42 The string efficiency of an insulator can be increased by
[A] Reducing the number of strings in the insulator
[B] Increasing the number of strings in the insulator
[C] Correct grading of insulators of various capacities
[D] None of these
Answer: Correct grading of insulators of various capacities

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43 Due to skin effect at high frequencies, the effective value of conductor resistance
[A] Increases
[B] Decreases
[C] Remains unaltered
[D] May increases or decrease
Answer: Increases
44 Conductors used in high voltage transmission lines are stranded to
[A] Increases its tensile strength
[B] Increase its conductivity
[C] Reduce the cost
[D] Make it easy to handle
Answer: Increases its tensile strength
45 Relative to fair weather, in humid weather corona occurs at
[A] Almost the same voltage
[B] Higher voltage
[C] Lower voltage
[D] None of these
Answer: Lower voltage
46 Transmission lines are classified as short, medium and long depending on the
[A] Length of line
[B] Charging current or on load current
[C] Capacitance of line
[D] Both (a) and (b) above
Answer: Both (a) and (b) above
47 Reactive power can be injected into a transmission line by using
[A] Series capacitors
[B] Shunt capacitors and reactors
[C] Synchronous capacitors
[D] Any of these
Answer: Any of these
48 As the height of a transmission tower is altered, the parameter which changes is
[A] Conductance
[B] Capacitance
[C] Inductance
[D] None of these
Answer: Capacitance
49 In conductor of power transmission line, the voltage gradient is maximum at its
[A] Surface
[B] Circle with half the radius
[C] Centre
[D] Somewhere between (b) and (c) above
Answer: Surface
50 EHV cable are filled with thin oil under pressure to
[A] Prevent formation of voids
[B] Prevent entry of moisture
[C] To strengthen the cable conductor
[D] To provide insulation
Answer: Prevent formation of voids
51 cables in power transmission line are provided with intersheaths to
[A] Minimize charging current
[B] Provide uniform stress distribution
[C] Minimize high voltage
[D] All of these
Answer: Provide uniform stress distribution
52 Temperature increase produces which of the following effect on a transmission line?
[A] Tension of the conductor and its sag decreases
[B] Tension of the conductor and its sag increases
[C] Tension of the conductor decreases and its sag increases
[D] Tension of the conductor increases and its sag decreases
Answer: Tension of the conductor decreases and its sag increases
53 Impedance and capacitance of a transmission line depend upon
[A] Current in the line alone
[B] Voltage in the line alone
[C] Both (a) and (b)
[D] Physical configuration of conductors in space
Answer: Physical configuration of conductors in space
54 High tension cable can be used for power transmission for voltages not exceeding
[A] 11 kV
[B] 22 kV
[C] 33 kV
[D] 110 kV
Answer: 33 kV
55 In short overhead transmission line (upto 80 km), we may neglect
[A] Series resistance
[B] Shunt conductance
[C] Shunt capacitance
[D] Both shunt conductance and capacitance
Answer: Both shunt conductance and capacitance
56 As the moisture content in the air increases, the disruptive critical voltage
[A] Remain constant
[B] Decreases
[C] Increases
[D] May increases or decreases
Answer: Decreases
57 If the voltage as well as reactance of a transmission line is double, the maximum steady state power limit of the line
[A] Remains unaltered
[B] Doubles
[C] Becomes 4 times
[D] Becomes 8 times
Answer: Doubles
58 Rise of temperature of transmission line
[A] Increases the stress and decreases the length
[B] Increases the stress and increases the length
[C] Decreases the stress and increases the length
[D] Decreases the stress and decreases the length
Answer: Decreases the stress and increases the length
59 A short transmission line has equivalent circuit consisting of
[A] Series resistance R and series inductance L
[B] Series resistance R and series capacitance C
[C] Series resistance R and series capacitance G
[D] Series inductance L and series capacitance G
Answer: Series resistance R and series inductance L
60 Proximity effect is due to current flowing in the
[A] Earth
[B] Sheath
[C] Neighbouring conductor
[D] All of these
Answer: Neighbouring conductor

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