Top 80+ Solved Power Quality and Management MCQ Questions Answer
Q. In a load comprising of resistance and inductance:
a. Load current lags voltage
b. Load voltage lags current
c. Both are in phase
d. Any of above
Q. The power factor of capacitive circuits is:
a. Leading
b. Lagging
c. Both of these
d. Any of these
Q. A circuit having poor power factor will draw:
a. No current
b. Low current
c. Normal current
d. High current
Q. The power factor of purely inductive circuits is:
a. Leading
b. Lagging
c. Both of these
d. Any of these
Q. Which of the following statement refer to IEEE definition on power quality?
a. The concept of powering of any electronic equipment in a manner suitable for the equipment.
b. The concept grounding sensitive electronic equipment in a manner suitable for the equipment.
c. The concept of grounding for whatever equipment in a manner suitable for the equipment.
d. The concept of powering and grounding sensitive electronic equipment in a manner suitable for the equipment.
Q. Which of the following explains the reasons for concern with power quality?
a. End-user equipment become more sensitive to power quality due to many microprocessor-based controls
b. The adjustable-speed motor drives helps to reduce harmonic levels
c. Modern load & equipment are less sensitive to power quality variations.
d. Power electronics equipment do not affect the power quality at all.
Q. The following statement describes the effects of poor power quality, EXCEPT
a. Equipment malfunction
b. Increased costs from downtime
c. Premature failure of equipment
d. Reduced maintenance, repair time and expenses
Q. Since most of the industrial loads are inductive type, which of the following will help to correct the power factor?
a. Increase lagging reactive current demand of the loads
b. Compensate lagging reactive current by supplying leading reactive current to the power system
c. Compensate leading reactive current by supplying lagging reactive current to the power system
d. Reduce leading reactive current demand of the loads
Q. Which of the following is an advantages of power factor correction (PFC)?
a. Electricity bills increased
b. Power consumption reduced
c. Increased heating in equipment
d. Extra kVAr availability from the supply
Q. Which of the following represents short duration voltage variation?
a. Under Voltage
b. Over Voltage
c. Voltage Outage
d. Voltage Interference
Q. Which of the following terms describes the transient voltage variation?
a. The duration is within 0.5 s to 30 cycles
b. It can be classify to instantaneous, momentary or temporary
c. It can be solved by using static Var systems
d. It can be caused by lightning, electrostatic discharge or load switching.
Q. Which of the following terms describes the effects of harmonics to industrial power systems?
a. Disturbance to Electric and Electronic Devices
b. Extra Fault Current
c. Lower Losses
d. Increased costs from downtime