# MCQ TEST | Chapter 1: Power Quality and Management (PQM) | Electrical Engineering Quiz | Important For Final year GTU Exam 2020

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Hello Dear GTU Students, Here we provide MCQ test For your upcoming Final Year Exam 2020. Today we provide test for Power Quality and Management Subject of Electrical Engineering Department. Today we cover MCQ for Chapter 1: Power Quality and Management. This MCQ test is very useful for your upcoming final year exam.

## Chapter 1: Power Quality and Management (PQM) (Electrical Engineering)

Which of the following is not a source of harmonic current?

A. UPS Systems
B. Capacitor Switching
D. Computers

Explanation: Current harmonics are caused by non-linear loads. When a non-linear load, such as a rectifier is connected to the system, it draws a current that is not necessarily sinusoidal.

Which of the following will not comes under disturbance with respect to power quality?

A. Interruption in supply
B. Harmonic Distortion
C. Transients
D. Voltage Sag

Explanation: The power quality disturbance such as voltage, sag, swell, flicker, interruption, transients, notches and spike is the basic single-component power quality disturbance.

Which one of the following is waveform distortion?

A. DC offset
B. Notching
C. Electrical noise
D. All the options are correct

Explanation: Waveform distortions are common power problems that cause equipment to malfunction and sources of power to overload. It is an unexpected change in the waveforms of current and voltage as they pass through a device. There are five main types of waveform distortions: DC offset, harmonics, interharmonics, notching and noise.

Filters are used to reduce which of the following:

A. Harmonics
B. Voltage distortion
C. Voltage sag
D. All the options are correct

Explanation:

Continuous and rapid variations in the load current magnitude which causes voltage variations:

A. Harmonics
B. Voltage distortion
C. Flicker
D. Voltage sag

Explanation: Equipment or devices that exhibit continuous, rapid load current variations (mainly in the reactive component) can cause voltage fluctuations and light flicker.

Which one of the following cannot be possible with voltage surges?

A. Damage to electronic components
B. Tripping of Sensitive Equipment
C. Damaging to insulation
D. Flicker in Incandescent Lamps

Explanation:

Which of the following contribute to the low voltage and poor power factor?

A. Reactive Power
B. Harmonics
D. All the options are correct

Answer: All the options are correct
Explanation:

______ is the short time reduction in the rms voltage between 0.1 to 0.9 p.u for a duration of 0.5 cycle to 1 minute.

A. Voltage sag
B. Voltage Interruption
D. Voltage surge

Explanation: A voltage sag is a short duration reduction in rms voltage which can be caused by a short circuit, overload, or starting of electric motors. A voltage sag happens when the rms voltage decreases between 10 and 90 percent of nominal voltage for one-half cycle to one minute.

Total Harmonic Distortion (THD) is defined as the ratio of the Actual Fundamental to RMS harmonic content.

A. True
B. False

Answer: All the options are correct
Explanation: Total Harmonic Distortion (THD) is defined as the ratio of the RMS harmonic content to Actual Fundamental.

Which of the following is not considered as good power quality voltage.

A. Has a constant RMS Value unchanged with time
B. Power Supply is more compared to demand
C. Supplied at Constant Velocity
D. Having a Constant sine wave with fundamental component

Answer: Power Supply is more compared to demand
Explanation:

The third harmonic currents are known as ______.

A. Positive sequence harmonics
B. Negative sequence harmonics
C. Zero sequence harmonics
D. Positive-Negative sequence harmonics

Explanation:

Harmonics cause which of the following:

A. All the Options are Correct
B. Capacitor Failure
C. Nuisance Tripping
D. Heating in windings

Explanation:

The diversity factor is defined as the______.

A. (Average demand)/(Maximum demand)
B. (Sum of consumers maximum demand)/(Maximum load on the station)
C. (Maximum demand)/(Sum of consumers maximum demand)
D. (Average demand)/(Maximum load on the station)

Explanation:

Form Factor is ratio of RMS Value to the Peak Value of the periodic wavefoem.

A. True
B. False

Explanation:

Crest Factor is the ratio of the RMS Value to peak value of the volatge/current.

A. True
B. False

Explanation: Crest Factor is the ratio of the peak value to the RMS value of the voltage/current.

______ is the relation between the RMS value of the Harmonic content of a periodic waveform to the RMS value of the periodic wave.

A. Form Factor
B. Distoration Factor
C. Crest Factor
D. Disturbance Factor

Explanation:

Harmonics in the system can ________.

A. Make relays maloperate
B. Can cause increase in resonace
C. Increase loss in Capacitances, Noises
D. All of above

Explanation:

Electromagnetic Interference (EMI) cause which of the following:

A. Electromagnetic Disturbances
B. Relays
C. Furnaces
D. All of above

Explanation:

Which Factors are affecting voltage sag?

A. Inrush Current
B. Line to Ground Faults
C. Sudden Change in Load Voltage
D. All of above