MCQ TEST | Chapter 6: Power Factor (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 6: Power Factor. This MCQ test is very useful for your upcoming final year exam.

Chapter 6: Power Factor (PQM) (Electrical Engineering)

______________ is defined as the average rate of delivery of energy by which useful work can be donw.

A. Apparent Power
B. Real Power
C. Reactive Power
D. None of the above

View Answer
Answer:Real Power

Explanation:

_______ is the product of the RMS voltage and current.

A. Apparent Power
B. Real Power
C. Reactive Power
D. None of the above

View Answer
Answer:Apparent Power

Explanation:

The Benefits of power factor Correction are

A. Reduced Losses
B. Extended life of equipment
C. Improved efficiecy
D. All of the above

View Answer
Answer:All of the above

Explanation:

Active power and apparent power are respectively represented by?

A. kW and kVAR
B. kVAR and kVA
C. kVA and kVAR
D. kW and kVA

View Answer
Answer:kW and kVA

Explanation:

Wattmeter measures which of the following power:

A. Reactive power
B. Real Power
C. Apparent power
D. None of the above

View Answer
Answer:Real Power

Explanation: A wattmeter measures watts, real power. and A VAR meter measures VARs, reactive ‘power’.

In a highly capacitive circuit the actual power will be always:

A. Lesser than the reactive power
B. Larger than the reactive power
C. Equal to apparent power
D. Equal to reactive power

View Answer
Answer:Lesser than the reactive power

Explanation:

The Power factor in the circuit having high magnetizing current flowing is:

A. Low Power factor
B. Unity Power factor
C. High Power factor

View Answer
Answer: Low Power factor

Explanation:

Power factor in an ac circuit is defined as the ratio of apparent power to the real power.

A. True
B. False

View Answer
Answer:False

Explanation: In AC circuits, the power factor is the ratio of the real power that is used to do work and the apparent power that is supplied to the circuit.

Calculate the power factor in a circuit having true power 800 watts and apparent power 1000 watts.

A. 0.8
B. 1.25
C. 0.6
D. 0.85

View Answer
Answer:0.8

Explanation: the power factor is the ratio of the real power that is used to do work and the apparent power.

In a lightly loaded long distance EHV lines, line loading is ________ in nature and has leading power factor.

A. Both Capacitive and Inductive
B. Inductive
C. Capacitive
D. Resistive

View Answer
Answer:Capacitive

Explanation:

Induction motors generally operate with ________ power factor.

A. Lagging
B. Leading
C. Unity

View Answer
Answer:Lagging

Explanation:

Poor Power factor in a line cannot cause which of the following:

A. Voltage dips in circuit
B. Insulation failure
C. Poor Voltage regulation
D. Increase in losses

View Answer
Answer:Insulation failure

Explanation:

Q factor of the circuit is __ to the Power factor of the circuit.

A. Inverse to
B. Equal to

View Answer
Answer:Inverse to

Explanation:

Power factor cannot be improved by which of the following methods:

A. Shunt reactors
B. Shunt capacitors
C. Synchronous phase modifiers
D. None of above

View Answer
Answer:Shunt reactors

Explanation:

If the load current decreases then the power factor

A. Will also decrease
B. Will increase
C. Will remains unchanged
D. None of these

View Answer
Answer:Will increase

Explanation:

What is maximum value of power factor?

A. 0.5
B. 1
C. 1.5
D. 0.95

View Answer
Answer:1

Explanation: The maximum value of power factor is one. It occurs in a pure resistor circuit. As in AC circuits, the power factor is the ratio of the real power that is used to do work and the apparent power that is supplied to the circuit. So, power factor lies within a range from 0 to 1.

Lower power factor is usually not due to

A. Discharge lamp.
B. Arc lamps.
C. Incandescent lamps.
D. Induction furnace.

View Answer
Answer:Incandescent lamps

Explanation:

For a consumer what is the most economical power factor?

A. 0.25 – 0.5 lagging
B. 0.25 – 0.5 leading
C. 0.85 – 0.95 lagging
D. 0.85 – 0.95 leading

View Answer
Answer:0.85 – 0.95 lagging

Explanation:

The most suitable location for the power factor improvement device is

A. Near the electrical appliance which is responsible for the poor power factor
B. At the sending end
C. At the receiving end in case of transmission lines
D. Both (a) and (c)

View Answer
Answer:Both (a) and (c)

Explanation:

Power factor can be mathematically expressed as _____.

A. P/Q
B. Q/P
C. P/S
D. S/P

View Answer
Answer:P/Q

Explanation:

In order to improve the power factor which device should be connected to the power system.

A. Series capacitor
B. Shunt capacitor
C. Series inductor
D. Shunt inductor

View Answer
Answer:Shunt capacitor

Explanation:

The power factor of an ac circuit is equal to _____.

A. Cosine of the phase angle
B. Sine of the phase angle
C. Tangent of the phase angle
D. Cotangent of the phase angle

View Answer
Answer:Cosine of the phase angle
Explanation:

Select the correct sentence from the sentence below.

A. Under transient conditions, Static VAR Compensators (SVC) gives faster response.
B. Static VAR Compensators (SVC) increase short circuit currents.
C. A & B
D. None of the above

View Answer
Answer:Under transient conditions, Static VAR Compensators (SVC) gives faster response.
Explanation: