Power Quality

Which of the following statement refer to IEEE definition on power quality?

• The concept of powering of any electronic equipment in a manner suitable for the equipment.

• The concept grounding sensitive electronic equipment in a manner suitable for the equipment.

• The concept of grounding for whatever equipment in a manner suitable for the equipment.

• The concept of powering and grounding sensitive electronic equipment in a manner suitable for the equipment.

Which of the following explains the reasons for concern with power quality?

• End-user equipment become more sensitive to power quality due to many microprocessor-based controls

• The adjustable-speed motor drives helps to reduce harmonic levels

• Modern load & equipment are less sensitive to power quality variations.

• Power electronics equipment do not affect the power quality at all.

The following statement describes the effects of poor power quality, EXCEPT

• Equipment malfunction

• Increased costs from downtime

• Premature failure of equipment

• Reduced maintenance, repair time and expenses

Since most of the industrial loads are inductive type, which of the following will help to correct the power factor?

• Increase lagging reactive current demand of the loads

• Compensate lagging reactive current by supplying leading reactive current to the power system

• Compensate leading reactive current by supplying lagging reactive current to the power system

• Reduce leading reactive current demand of the loads

Which of the following is an advantages of power factor correction (PFC)?

• Electricity bills increased

• Power consumption reduced

• Increased heating in equipment

• Extra kVAr availability from the supply

Which of the following represents short duration voltage variation?

• Under Voltage

• Over Voltage

• Voltage Outage

• Voltage Interference

Which of the following terms describes the transient voltage variation?

• The duration is within 0.5 s to 30 cycles

• It can be classify to instantaneous, momentary or temporary

• It can be solved by using static Var systems

• It can be caused by lightning, electrostatic discharge or load switching.

Which of the following signal describes under voltage in a power line?

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Which of the following signal describes voltage swell in a power line?

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Which of the following terms describes the effects of harmonics to industrial power systems?

• Disturbance to Electric and Electronic Devices

• Extra Fault Current

• Lower Losses

• Increased costs from downtime