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Free download in PDF Transmission and Distribution Short Questions and 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.
41
The topmost wire in a distribution line is
[A]
Phase wire
[B]
Earth wire
[C]
Neutral wire
[D]
Any of these
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
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
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
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
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
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
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
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
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
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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