Power System Planning and Design (2180903) MCQs

MCQs of Transmission Line Design

Showing 61 to 70 out of 85 Questions
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61.
Voltage across the various discs of a string of suspension insulator having identical discs is different due to
(a) Surface leakage currents
(b) Series capacitance
(c) Series and shunt capacitance
(d) Shunt capacitance to ground
Answer:

Option (d)

62.
String efficiency of suspension insulators dependents on
(a) Size of insulator
(b) Number of discs in the string
(c) Arrangement of string
(d) Size of tower
Answer:

Option (b)

63.
Maximum voltage of the disc type insulators is at
(a) Near the conductors
(b) Same at all points
(c) Near starting of the insulator
(d) None of above
Answer:

Option (a)

64.
String efficiency of a high voltage line is around
(a) 10%
(b) 50%
(c) 80%
(d) 100%
Answer:

Option (d)

65.
Voltage across the string of insulator is ___________ times the line voltage
(a) √2
(b) √3
(c) 1/√2
(d) 1/√3
Answer:

Option (b)

66.
Guard ring
(a) Reduce the earth capacitance of the lowest unit
(b) Increase the earth capacitance of the lowest unit
(c) Reduce the transmission line losses
(d) None of above
Answer:

Option (a)

67.
Insulators are failed due to
(a) Flash over
(b) Faults
(c) Dust deposition
(d) All of above
Answer:

Option (d)

68.
Number of discs in a string of insulators for 220 kV over head transmission line lies in the range of
(a) 9 – 10
(b) 12 – 14
(c) 22 – 23
(d) 32 – 33
Answer:

Option (b)

69.
Electrically short, medium and long lines are classified based on
(a) Nominal voltage of the line
(b) Length of the line
(c) Nature of conductor arrangement on line
(d) Power transmitted over the line
Answer:

Option (b)

70.
Capacitance effect can be neglected in
(a) Short transmission lines
(b) Medium transmission lines
(c) Long transmission lines
(d) All of above
Answer:

Option (a)

Showing 61 to 70 out of 85 Questions
4 5 6 7 8 9