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Insulators MCQs | Insulators Multiple Choice Questions and Answers

Questions
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

Answer: Right hand
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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

Answer: High, low
4 How many classifications of overhead line insulators are there?
A 5
B 7
C 3
D None

Answer: 3
5 Which of the following material is not used for overhead line insulators?
A Porcelain
B Glass
C PVC
D Steatite

Answer: PVC
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

Answer: 132 KV
8 Which of the following insulator is similar to pin type insulator?
A Suspension insulator
B Shackle insulator
C Strain insulator
D Post insulator

Answer: 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

Answer: 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%

Answer: 78%
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

Answer: 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

Answer: Twisting stress
16 Suspension type insulator are subjected to ______________
A compressive stress
B tensile and compressive stress
C depends on its use
D tensile stress

Answer: tensile stress
17 Suspension insulator are made up of _____________
A porcelain
B glass
C steatite
D epoxy resin

Answer: porcelain
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

Answer: Flashover

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