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Free download in PDF Insulators Multiple Choice 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.
(1)
What is the other name of Polymer Insulator?
[A]
Composite insulator
[B]
Moisture insulator
[C]
Core insulator
[D]
Mixed insulator
Answer: Composite insulator
(2)
What is the other name of shackle insulator?
[A]
String
[B]
Hanging
[C]
Spool
[D]
Post
(3)
What is the dielectric strength, coefficient of thermal expansion of glass with respect to porcelain insulators?
[A]
High, high
[B]
Low, low
[C]
High, low
[D]
None of these
(4)
How many classifications of overhead line insulators are there?
[A]
5
[B]
7
[C]
3
[D]
None
(5)
Which of the following material is not used for overhead line insulators?
[A]
Porcelain
[B]
Glass
[C]
PVC
[D]
Steatite
(6)
Which of the following is the main field of application of pin type insulator?
[A]
EHV transmission system
[B]
Transmission and distribution system
[C]
Transmission system
[D]
Distribution system
Answer: Distribution system
(7)
A transmission line consists of 9 discs of suspension insulator in each string. What is the operating voltage of the transmission line?
[A]
132 KV
[B]
11 KV
[C]
33 KV
[D]
None of these
(8)
Which of the following insulator is similar to pin type insulator?
[A]
Suspension insulator
[B]
Shackle insulator
[C]
Strain insulator
[D]
Post insulator
(9)
What is the most common cause of failure of overhead line insulators?
[A]
Improper vitrification
[B]
Mechanical stress
[C]
Porosity of materials
[D]
Flashover
(10)
If a string of suspension insulator has three units, each can withstand a maximum 11 KV and total string can withstand 25.76 KV. What is the string efficiency?
[A]
78%
[B]
234.1%
[C]
46.3%
[D]
68.75%
(11)
What is the property of insulating materials?
[A]
Allows the unwanted flow of current
[B]
Increases the unwanted flow of current
[C]
Decreases the unwanted flow of current
[D]
Prevents the unwanted flow of current
Answer: Prevents the unwanted flow of current
(12)
What happens when some serious phenomenon occurs in the insulators?
[A]
Insulator body bulges
[B]
Insulator body bursts
[C]
Insulator body tears apart
[D]
Puncher is produced in the insulator body
Answer: Puncher is produced in the insulator body
(13)
How should the properties of strength and dielectric strength in insulating materials?
[A]
High strength, high Dielectric strength
[B]
Low strength, low Dielectric strength
[C]
High strength, low Dielectric strength
[D]
Low strength, high Dielectric strength
Answer: High strength, high Dielectric strength
(14)
What is the dielectric strength of porcelain insulators?
[A]
50 kV/cm
[B]
40 kV/cm
[C]
140 kV/cm
[D]
60 kV/cm
(15)
Pin type insulator are mostly subjected to which type of mechanical stress?
[A]
Twisting stress
[B]
Compressive stress
[C]
Tensile stress
[D]
Both tensile and compressive stress
(16)
Suspension type insulator are subjected to ______________
[A]
compressive stress
[B]
tensile and compressive stress
[C]
depends on its use
[D]
tensile stress
(17)
Suspension insulator are made up of _____________
[A]
porcelain
[B]
glass
[C]
steatite
[D]
epoxy resin
(18)
Voltage distribution across disc of strings of suspension insulator assembly is ______
[A]
same for all disks
[B]
maximum for unit nearest to the line
[C]
equal to transmission line voltage rating
[D]
maximum for unit nearest to the tower
Answer: maximum for unit nearest to the line
(19)
In Transmission and Distribution sector, where should the insulators be placed?
[A]
Between towers and poles
[B]
Between towers and ground
[C]
Between towers and conductors
[D]
Between conductors and ground
Answer: Between towers and conductors
(20)
What is the main cause for the failure of overhead line insulators?
[A]
Flashover
[B]
Surges
[C]
Arching
[D]
Grounding
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