Power System - I (3140914) MCQs

MCQs of Mechanical Features and Design of Overhead Transmission Line

Showing 61 to 70 out of 108 Questions
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61.
Which material is not used in making porcelain insulators?
(a) Kaolin
(b) Quartz
(c) Silica
(d) Felspar
Answer:

Option (c)

62.
HV transmission line uses
(a) Pin type insulator
(b) Suspension type insulator
(c) Both (a) and (b)
(d) None of above
Answer:

Option (c)

63.
Pin type insulators are generally not used for voltages exceeding
(a) 66 kV
(b) 33 kV
(c) 25 kV
(d) 11 kV
Answer:

Option (b)

64.
Wavy structure of pin increases its
(a) Mechanical strength
(b) Puncture strength
(c) Flash over voltages
(d) Thermal strength
Answer:

Option (c)

65.
The voltage rating of a multiple shell pin insulator unit cannot be increased beyond a limiting value by increasing the number of shells, because
(a) Internal voltage distribution between shells becomes unequal
(b) Leakage path resistance starts diminishing
(c) Disruptive critical voltage for the material of the insulator is reached
(d) Puncture voltage of the material of the insulator is reached
Answer:

Option (a)

66.
Which type of insulators are used on 132 kV transmission lines?
(a) Pin type
(b) Disc type
(c) Shackle type
(d) Pin and Shackle type
Answer:

Option (b)

67.
Whenever the conductor are dead-ended or there is a change in the direction of transmission line, insulators used are of the
(a) Pin type
(b) Suspension type
(c) Strain type
(d) Shackle type
Answer:

Option (c)

68.
Post type insulators are generally used in lines operating
(a) Above 100 kV
(b) Below 33 kV
(c) At any voltage level
(d) At 66 kV
Answer:

Option (c)

69.
For a 400 kV line the number of disc in an insulator string is around
(a) 37
(b) 31
(c) 25
(d) 16
Answer:

Option (c)

70.
The number of discs in a string of insulator for 400 kV AC overhead transmission line lies in the range of
(a) 32  to 33
(b) 22 to 23
(c) 15 to 16
(d) 9 to 10
Answer:

Option (b)

Showing 61 to 70 out of 108 Questions
4 5 6 7 8 9