Power System Planning and Design (2180903) MCQs

MCQs of Insulation co-ordination

Showing 1 to 10 out of 43 Questions
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1.
Basic impulse level (BIL) of a power system is define as
(a) Minimum insulation impulse withstand voltage of any power equipment or apparatus
(b) Maximum power frequency withstand voltage of any power equipment for apprentice
(c) Minimum power frequency withstand voltage of any apparatus or power equipment
(d) Peak value of highest system voltages
Answer:

Option (a)

2.
The insulation of modern EHV and UHV lines is designed based on
(a) Corona
(b) Radio interface
(c) Lightning voltage
(d) Switching voltage
Answer:

Option (d)

3.
Power system insulation problem involves
(a) Selection of basic insulation level of system equipment and lightning arrestor
(b) Determination of line insulation
(c) Capacitance of earth and subsequent grounding
(d) None of above
Answer:

Option (a)

4.
The protection against direct lightning strokes and high voltage steep waves is provided by
(a) Ground wires
(b) Lightning arresters
(c) Lightning arresters and ground wires
(d) Earthing of neutral
Answer:

Option (c)

5.
Which of the following factors should be considered the design of a transmission line against lightning with ground wire?
(a) Mechanical strength of ground wire
(b) Clearance between line conductor and ground wire
(c) Clearance between line conductor and earth
(d) All of above
Answer:

Option (d)

6.
Lighting arresters are used in power system to protect electrical equipments against
(a) Direct stokes of lightning
(b) Over-voltages due to indirect lightning stroke
(c) Power frequency over-voltages
(d) Over-currents due to lightning
Answer:

Option (c)

7.
Impulse ratios of insulators and lightning arresters should be
(a) Both low
(b) Both high
(c) High and low respectively
(d) Low and high respectively
Answer:

Option (b)

8.
Which of the following is the protective device against lightning over-voltages?
(a) Rod gaps
(b) Surge absorbers
(c) Horn gaps
(d) All of above
Answer:

Option (d)

9.
Overhead ground wires are used to protect a transmission line against
(a) Line-to-ground faults
(b) Arcing earths
(c) Voltage surges due to direct lightning stroke
(d) High voltage oscillations due to switching
Answer:

Option (c)

10.
An overhead transmission line is provided with earth wire for protection against
(a) Switching surge
(b) Lightning surge
(c) Power frequency over voltage
(d) All of above
Answer:

Option (b)

Showing 1 to 10 out of 43 Questions
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