# MCQ TEST | Chapter 4: Harmonics (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 4: Harmonics. This MCQ test is very useful for your upcoming final year exam.

## Chapter 4: Harmonics (PQM) (Electrical Engineering)

When analyzing a nonsinusoidal waveform, it is often important to know the ______ of the harmonic components present.

A. Magnitude and Phase angle
B. Phase angle only
C. Magnitude only
D. None of above

Explanation:

Due to Harmonics in Transformer which of the following losses increases?

A. Eddy Current Loss only
B. Hysteresis Loss only
C. Both Hysteresis loss and eddy current loss
D. None of above

Answer:Both Hysteresis loss and eddy current loss
Explanation:

Harmonic currents are generated at load distortion level by

A. Generation
B. Transmission
C. Distribution
D. All the above

Answer:Both Hysteresis loss and eddy current loss
Explanation:

When one or more harmonic components are added to the fundamental frequency, a non distorted (nonsinusoidal) waveform is produced.

A. True
B. False

Explanation:

Harmonic distortion is produced by

C. A & B
S. non

Explanation: Harmonic distortions are usually caused by the use of nonlinear loads by the end users of electricity

Harmonic indices are used to measure harmonic content of a

A. Voltage
B. Frequency
C. Waveform
D. none

Explanation: Harmonic indices, serve as a useful metric of system performance. They are measures of the effective value of a waveform.

Harmonic problem combined with _________ power factor.

B. lag
C. Unity
D. none

Explanation:

Non linear loads are classified into ___ groups.

A. 5
B. 2
C. 4
D. 3

Explanation:

An single electronic ballast can drive up to ____ fluorescent lamp.

A. 2
B. 4
C. 5
D. 8

Explanation:

Passive filter is used to control _____.

A. voltage
B. Frequency
C. current
D. harmonics

Explanation: A passive ﬁlter component is a combination of capacitors and inductors that are tuned to resonate at a single frequency, or through a band of frequencies. In power systems, passive ﬁlters are used to suppress harmonic currents and decrease voltage distortion appearing in sensitive parts of the system.

Ballast is ______ limiting device.

A. voltage
B. Frequency
C. current
D. none

Explanation: A ballast provides a positive resistance or reactance that limits the current. The ballast provides for the proper operation of the negative-resistance device by limiting current. Ballasts can also be used simply to limit the current in an ordinary, positive-resistance circuit.

Passive Filter should be placed on a

A. transformer
B. buses
C. lines
D. none

Explanation:

A Series passive filter is connected in ____ with the load.

A. parallel
B. Series
C. none

Explanation: The passive series filter incorporates the application of parallel resonance mechanism. The RLC combination, acting as a series resonance for the passive harmonic filter is connected in series with the input power supply and the load (Variable Frequency Drive cascaded induction motor).

A Low pass filter is used to block ____ harmonic frequencies.

A. Multiple
B. Single
C. 3rd Order
D. Fundamental

Explanation:

____ is the ratio between the RMS value of the harmonics and the RMS value of the Fundamental.

A. Total Harmonic Distoration (THD)
B. Individual Harmonic Distoration (IHD)
C. none of above

Explanation:

Harmonics in the system can _______.

A. Make relay malfunction
B. Increase Noise in Machine
C. Increase losses in capacitors and transformers
D. all of above

Explanation:

Symmetrical waveforms will contain only __ numbered harmonics.

A. Odd and Even both
B. Neither odd and even
C. Even only
D. Odd only

Explanation:

Because of the harmonics, conductor resistance will _____.

A. Increase
B. Decrease

Explanation:

Harmonics can be eliminated by introducing which of the following:

A. High Impedance
B. Filters
C. Low impedance path
D. Resonant circuit

Explanation:

Which of the following device is not the source of harmonics?