MCQs of Mechanical Features and Design of Overhead Transmission Line (Power System - I - 3140914)

Power System - I (3140914) MCQs

MCQs of Mechanical Features and Design of Overhead Transmission Line

Showing 81 to 90 out of 108 Questions

81.

String efficiency can be improved by

(a)	Using long cross arms
(b)	Using guard ring
(c)	Guarding the insulators
(d)	Any of above

82.

Ratio of puncture voltage to the flash over voltage of a line insulator is

(a)	Equal to 1
(b)	Less than 1
(c)	Greater than 1
(d)	None of above

83.

Insulators used in guy cables are

(a)	Stay type insulators
(b)	Shackle type insulators
(c)	Pin type insulators
(d)	Disc type insulators

84.

Insulators may fail due to

(a)	Flash over
(b)	Short circuit
(c)	Deposition of dust
(d)	Any of above

85.

The purpose of guard ring in transmission line is to

(a)	Reduce the earth capacitance of lowest unit
(b)	Increase the earth capacitance of the lowest unit
(c)	Reduce the transmission line losses
(d)	None of above

86.

Use of guard ring

(a)	Equalizes the voltage division between insulator disc
(b)	Is unnecessary
(c)	Decreases string efficiency
(d)	None of above

87.

Which of the statement is correct about erection of pole?

(a)	Dead-man and derrick pole methods of erection of poles are used respectively for heavier pole and lighter pole
(b)	Dead-man and derrick pole methods of erection of poles are used respectively for lighter pole and heavier pole
(c)	Dead-man pole methods of erection of poles is used for both lighter pole and heavier pole
(d)	None of above

88.

Cradle guards are provided on the road crossing for the safety of the

(a)	Power line itself
(b)	Human beings, animals and material moving on the road
(c)	Both (a) and (b)
(d)	Neither (a) and (b)

89.

The short length of conductor used to connect the line conductor on one side of the terminal pole to the line conductor on the other side of pole is knoen as

(a)	Jumper
(b)	Petticoat
(c)	Guard
(d)	Guy

90.

Insulation resistance test is preformed on power line with

(a)	Ohm meter
(b)	Earth tester
(c)	Megger
(d)	Any of above

Showing 81 to 90 out of 108 Questions