Power Quality and Management (2180911) MCQs

MCQs of Introduction to Power Quality

Showing 31 to 40 out of 48 Questions
31.
The total power factor is greater than the displacement power factor,
(a) True
(b) False
Answer:

Option (b)

32.
__________ is the RMS reduction in the AC voltage at power frequency from half of a cycle to a few seconds’ duration.
(a) Surge
(b) Swell
(c) Sag
(d) Transient
Answer:

Option (c)

33.
Electrical transient characterized by a sharp increase in voltage or current is called as
(a) Sag
(b) Surge
(c) Swell
(d) Transient
Answer:

Option (b)

34.
__________ is the RMS increase in AC voltage at power frequency from half of a cycle to a few seconds’ duration
(a) Swell
(b) Sag
(c) Transient
(d) Surge
Answer:

Option (a)

35.
Subcycle disturbance in the AC waveform evidenced by a sharp, brief discontinuity of the waveform is known as ______________
(a) Swell
(b) Surge
(c) Sag
(d) Transient
Answer:

Option (d)

36.
The primary characteristics that define a transient are (i) peak amplitude (ii) rise time (iii) fall time (iv) frequency of oscillation
(a) (i), (iii), (iv)
(b) (i), (ii), (iv)
(c) (ii), (iii), (iv)
(d) (i), (ii), (iii), (iv)
Answer:

Option (d)

37.
______________ are low-frequency phenomena that result in voltage sags or swells.
(a) Power frequency disturbances
(b) Power system transients
(c) Power system harmonics
(d) Electro magnetic interference
Answer:

Option (a)

38.
_______________ are fast, short-duration events that produce distortions such as notching, ringing, and impulse.
(a) Power frequency disturbances
(b) Power system transients
(c) Power system harmonics
(d) Electro Static discharge
Answer:

Option (b)

39.
Grounding is done (i) for safety (ii) to provide a low-impedance path for the flow of fault current in case of a ground fault (iii) to create a ground reference plane for sensitive electrical equipment
(a) Only (i)
(b) Only (ii)
(c) (i) & (ii)
(d) (i), (ii), (iii)
Answer:

Option (d)

40.
_________________ refers to the interaction between electric and magnetic fields and sensitive electronic circuits and devices.
(a) Radio frequency interference
(b) Power frequency disturbances
(c) Electromagnetic interference
(d) Power system harmonics
Answer:

Option (c)

Showing 31 to 40 out of 48 Questions