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WorksheetsHigh Voltage Lab 6th Semester
Total questions: 10
Worksheet time: 3mins
1. Which of the following material is used for overhead line insulators?
a) Porcelain
b) Glass
c) PVC
d) Steatite
2)Suspension type insulator are subjected to ______________
a) tensile stress
b) compressive stress
c) tensile and compressive stress
d) depends on its use
3) Which of the following insulator is similar to pin type insulator?
a) Suspension insulator
b) Post insulator
c) Strain insulator
d) Shackle insulator
4) Suspension insulator are made up of _____________
a) glass
b) porcelain
c) steatite
d) epoxy resin
5) What is the most common cause of failure of overhead line insulators?
a) Flashover
b) Mechanical stress
c) Porosity of materials
d) Improper vitrification
6) 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) maximum for unit nearest to the tower
d) equal to transmission line voltage rating
7) Outdoor switchgear is generally used for voltage beyond
A. 11 KV
B. 33 KV
C. 66 KV
D. 132 KV
8) For protection of rotating machines against lightning surge .............is used
A. Lightning arrester
B. Capacitor
C. Combination of lightning arrester and a capacitor
D. Lightning conductor and arrester
9) Group of electrical equipment used to change characteristic of electric power is known as
(A) Generating station
(B) Substation
(C) Transmission system
(D) All of above
10) A substations used for voltage level change is known as
(A) Transformer substation
(B) Power factor correction substation
(C) Frequency changer substation
(D) None of above
