Power Quality and Management (2180911) MCQs

MCQs of Power Frequency Disturbance

Showing 1 to 10 out of 21 Questions
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1.
The term power frequency disturbance describes events that are ______________ and ________________ compared to electrical transients
(a) Fast , Short
(b) Fast , Long
(c) Slow, Short
(d) Slow, Long
Answer:

Option (d)

2.
The power frequency disturbances on the system remains same with the age of the equipment
(a) True
(b) False
Answer:

Option (b)

3.
Is it possible to measure the power frequency disturbances?
(a) Yes
(b) No
Answer:

Option (a)

4.
Typically, _________________ are produced due to starting on large loads, such as an electric motor or an arc furnace
(a) Voltage sags
(b) Voltage swells
(c) Voltage surges
(d) Voltage notches
Answer:

Option (a)

5.
Arc furnaces can produce large voltage ___________ in electrical power systems
(a) sags
(b) swells
(c) surge
(d) notch
Answer:

Option (a)

6.
When the arc furnace is off line, capacitor bank is switched on.
(a) True
(b) False
Answer:

Option (b)

7.
Approximately ___________ % of the utility-related faults occur in overhead power lines
(a) 50
(b) 70
(c) 80
(d) 60
Answer:

Option (b)

8.
Utility faults may occur due to (i) lightning strikes (ii) contact with trees (iii) contact with birds and animals (iv) failure of insulators
(a) (i), (ii), (iv)
(b) (i), (ii), (iii)
(c) (ii), (iii), (iv)
(d) (i), (ii), (iii), (iv)
Answer:

Option (d)

9.
Flicker is not a serious concern
(a) True
(b) False
Answer:

Option (a)

10.
Flicker is expressed as ___________________ where, Vmax and Vmin represent the change in voltage over the nominal voltage Vnom
(a) fv = 100 x ( Vmin - Vmax)/ Vnom
(b) fv = 100 x ( Vnom - Vmin)/ Vmax
(c) fv = 100 x ( Vmax - Vmin)/ Vnom
(d) fv = 100 x ( Vmin - Vnom)/ Vmin
Answer:

Option (c)

Showing 1 to 10 out of 21 Questions
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