1. IEEE stands for:
(A) Institute of Electrical and Electronics Engineers
(B) International Electrical and Electronics Establishment
(C) Industrial Electrical Energy Engineers
(D) International Energy Efficiency Association
2. IEC stands for:
(A) International Electrotechnical Commission
(B) Industrial Energy Council
(C) International Electrical Company
(D) Institute of Energy Control
3. IEEE 519 standard deals with:
(A) Harmonic limits in power systems
(B) Voltage sags only
(C) Frequency control
(D) Power factor correction
4. IEEE 1159 provides guidelines for:
(A) Monitoring and defining power quality disturbances
(B) Transformer design
(C) Capacitor bank sizing
(D) Overcurrent protection
5. IEC 61000-2-2 is concerned with:
(A) Voltage characteristics and limits for low-voltage systems
(B) High-voltage transmission line design
(C) Motor protection
(D) Battery standards
6. IEC 61000-4 series deals with:
(A) Testing and measurement techniques for electromagnetic compatibility (EMC)
(B) Power factor correction
(C) UPS design
(D) Energy auditing
7. The main purpose of power quality standards is to:
(A) Ensure reliable and disturbance-free operation of electrical systems
(B) Increase power factor only
(C) Reduce line losses only
(D) Improve frequency stability only
8. Voltage sag and swell limits are defined in:
(A) IEC 61000-2-2 and IEEE 1159
(B) IEEE 519 only
(C) IEC 60034 only
(D) NEMA MG1 only
9. Total Harmonic Distortion (THD) limits for voltage in distribution systems are recommended by:
(A) IEEE 519
(B) IEC 60364
(C) IEEE 1159
(D) IEC 60076
10. IEEE 1547 standard deals with:
(A) Interconnection of distributed energy resources with the grid
(B) UPS design
(C) Power factor correction
(D) Harmonic filters
11. IEC 61000-3-2 specifies:
(A) Limits for harmonic current emissions for equipment connected to public low-voltage networks
(B) Voltage sag limits
(C) Flicker limits
(D) Frequency deviation limits
12. IEC 61000-3-3 addresses:
(A) Limitation of voltage fluctuations and flicker
(B) Harmonic distortion
(C) Overcurrent protection
(D) UPS efficiency
13. The short-duration voltage variations like sags and swells are classified in standards as:
(A) Momentary, temporary, and sustained
(B) Low, medium, and high frequency
(C) Leading and lagging
(D) Reactive and active power
14. Flicker limits in low-voltage systems are defined by:
(A) IEC 61000-3-3
(B) IEEE 519
(C) IEEE 1159
(D) IEC 60076
15. Standards for uninterruptible power supply (UPS) performance are specified in:
(A) IEC 62040 series
(B) IEEE 519
(C) IEC 61000-2-2
(D) IEEE 1159
16. Voltage unbalance limits are defined in:
(A) IEEE 141 and IEC 61000-2-2
(B) IEEE 519 only
(C) IEC 60034 only
(D) IEEE 1159 only
17. Short-term flicker severity (Pst) should not exceed:
(A) 1.0
(B) 0.5
(C) 2.0
(D) 5.0
18. Long-term flicker severity (Plt) should not exceed:
(A) 0.8
(B) 1.0
(C) 1.2
(D) 0.5
19. Harmonic current limits for individual equipment depend on:
(A) Rated current and system voltage
(B) Frequency only
(C) Load power factor only
(D) Transformer size only
20. Voltage THD in distribution systems should generally not exceed:
(A) 5%
(B) 1%
(C) 10%
(D) 20%
21. IEEE 519 distinguishes between:
(A) Point of common coupling (PCC) and individual equipment limits
(B) Voltage and frequency only
(C) Reactive and active power only
(D) Transmission and distribution losses only
22. Standards define acceptable voltage deviations as:
(A) ±5% for long-term and ±10% for short-term in low-voltage systems
(B) ±20% only
(C) ±1% only
(D) ±50% only
23. Switching transients are addressed in:
(A) IEC 61000-4 series
(B) IEEE 519 only
(C) IEC 60364 only
(D) IEEE 1159 only
24. Voltage sag and swell durations are measured in:
(A) Cycles or seconds
(B) Hours only
(C) Minutes only
(D) Microseconds only
25. Power quality standards help in:
(A) Reducing equipment malfunction and downtime
(B) Increasing system voltage only
(C) Reducing active power only
(D) Reducing frequency fluctuations only
26. Harmonic resonance is considered in standards to:
(A) Avoid overloading of capacitors and transformers
(B) Reduce active power
(C) Correct frequency
(D) Improve voltage only
27. Voltage flicker monitoring is guided by:
(A) IEC 61000-4-15
(B) IEEE 519
(C) IEC 60034
(D) IEEE 1159
28. IEEE 141 (Red Book) provides:
(A) Guidelines for power distribution system design and voltage quality
(B) Harmonic limits only
(C) UPS performance standards only
(D) Renewable energy standards only
29. IEC 60364 standard deals with:
(A) Electrical installations in buildings, including power quality considerations
(B) UPS only
(C) Transformer design only
(D) Industrial harmonic mitigation only
30. The main goal of power quality standards (IEEE, IEC) is to:
(A) Ensure safe, reliable, and disturbance-free operation of electrical equipment and systems
(B) Reduce reactive power only
(C) Reduce system voltage only
(D) Increase transformer losses only