Power Quality and Management (2180911) MCQs

MCQs of Introduction to Power Quality

Showing 41 to 48 out of 48 Questions
2 3 4 5
41.
__________________ is the interaction between conducted or radiated radio frequency fields and sensitive data and communication equipment.
(a) Radio frequency interference
(b) Electromagnetic interference
(c) Power system harmonics
(d) Power frequency disturbances
Answer:

Option (a)

42.
Most electrical equipment is designed to operate within a voltage of ± _____ of nominal with marginal decrease in performance.
(a) 5 %
(b) 1 %
(c) 10 %
(d) 0.5 %
Answer:

Option (a)

43.
In in urban areas, the utility frequencies are rarely outside ± ________ Hz of the nominal frequency.
(a) 50
(b) 1
(c) 10
(d) 0.1
Answer:

Option (d)

44.
A penalty from industrial and commercial users of power is levied if the power factor is below ___________.
(a) 0.96
(b) 0.95
(c) 0.99
(d) 1
Answer:

Option (b)

45.
Which of the following equipment has low immunity index?
(a) electronic medical equipment
(b) adjustable speed drives
(c) transformers
(d) electromechanical relays
Answer:

Option (a)

46.
Which of the following equipment has high immunity index?
(a) electromechanical relays
(b) solid-state relays
(c) communication, and data processing equipment
(d) electronic ballasts
Answer:

Option (a)

47.
As per the power quality indices, which of the following applications face low power quality problems?
(a) HVAC power panels
(b) lighting power distribution panel
(c) elevators
(d) large motors
Answer:

Option (b)

48.
As per the power quality indices, which of the following applications face high power quality problems?
(a) Service entrance switchboard
(b) HVAC power panels
(c) large motors
(d) lighting power distribution panel
Answer:

Option (c)

Showing 41 to 48 out of 48 Questions
2 3 4 5