Testing and Commissioning of Electrical Equipments (2180901) MCQs

MCQs of Switch gear and Protective devices

Showing 1 to 10 out of 59 Questions
1 2 3 4 5 6
1.
Lightning arresters are used in the power system to protect electrical equipment against
(a) Direct strokes of lightning
(b) Over currents due to lightning
(c) Power frequency over-voltages
(d) None of these
Answer:

Option (c)

2.
A lightning arrester provides
(a) Low impedance path
(b) High impedance path
(c) Low resistance path
(d) High resistance path between line and earth during operation
Answer:

Option (a)

3.
The lightning arrester is conducted
(a) in series with the line
(b) between line and earth
(c) to a pole near the line
(d) to circuit breaker
Answer:

Option (b)

4.
A lightning arrestor is usually located nearer to -
(a) busbar
(b) transformer
(c) circuit breaker
(d) isolator
Answer:

Option (b)

5.
The lightning arrester acts as
(a) Surge diverter
(b) Surge coil
(c) Surge absorber
(d) Surge reflector
Answer:

Option (a)

6.
A lightning arrester connected between the line and earth in a power system
(a) Protects the terminal equipment against travelling surges
(b) Protects the terminal equipment against direct lightning stroke
(c) Suppresses high-frequency oscillations in the line
(d) Reflects back the travelling waves approaching it
Answer:

Option (a)

7.
Which system will need the lightning arrester of least voltage rating?
(a) Solid ground neutral system
(b) Insulated neutral system
(c) Resistance grounded neutral system
(d) Reactance grounded neutral system
Answer:

Option (a)

8.
What should be the location of Lightning Arrester use for the protection of the Direct Lightning Strock?
(a) At the highest high of the protecting equipment
(b) near the apparatus to be protected
(c) At the entry and the exit of substation
(d) All of these
Answer:

Option (a)

9.
What should be the location of Lightning Arrester use for the protection of the substation equipment?
(a) At the highest high of the protecting equipment
(b) near the apparatus to be protected
(c) At the entry and the exit of substation
(d) All of these
Answer:

Option (b)

10.
What should be the location of Lightning Arrester use for the protection of the substation?
(a) At the highest high of the protecting equipment
(b) near the apparatus to be protected
(c) At the entry and the exit of substation
(d) All of these
Answer:

Option (d)

Showing 1 to 10 out of 59 Questions
1 2 3 4 5 6