MCQ on Difference between kVA and kW

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KW is the amount of 'actual power' any electrical system has in it. kVA is the total measure of 'apparent' power. kW is the total amount of power one can work with. kVA report about power being consumed in the system. MCQ on Difference between kva and kw is covered in this article.

MCQ on Difference between kva and kw

Ques. The transformer ratings are usually expressed in

Volts
Amperes
kW
kVA

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Ans. d. kVA

Explanation: The transformer ratings are usually expressed in kVA

Ques. Power factor is a ratio of –

Apparent power to (real–reactive) power
True power to apparent power
Sum of real and reactive to apparent power
Apparent power to true power

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Ans. b. True power to apparent power

Explanation: Power factor is a ratio of true power to apparent power.

Ques. In a load comprising resistance and inductance –

Load current lags voltage
Load voltage lags current
Both are in phase
Any of above

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Ans. a. Load current lags voltage

Explanation: In a load comprising resistance and inductance, the load current lags voltage.

Ques. The maximum value of the power factor is (1 Mark)

0
0.3
0.95
1

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Ans. d. 1

Explanation: The maximum value of the power factor is 1.

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Ques. The active and apparent power is represented as –

kW and kVAR
kVAR and kVA
kVA and kVAR
kW and kVA

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Ans. d) kW and kVA

Explanation: The active and apparent power is always represented as kW and kVA.

Ques. Which of the following happens when the power factor is low?

The reduced handling capacity of the system.
Large kVA rating of the equipment.
Greater conductor size.
All of the above options are correct

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Ans. d) All of the above options are correct

Explanation: When the power factor is low following reaction takes place (i) the handling capacity of the system reduces (ii) the Large kVA rating of the equipment (iii) Greater conductor size.

Ques. Which is the most economical power factor for consumers?

0.25 – 0.5 lagging
0.85 – 0.95 lagging.
0.85 – 0.95 leading.
0.25 – 0.5 leading.

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Ans. b) 0.85 – 0.95 lagging.

Explanation: The most economical power factor for consumers is 0.85 – 0.95 lagging.

Ques. The major reason for the low power factor is the installation of –

Commutator motors.
Synchronous motors.
Induction motor
DC motors

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Ans. c) Induction motor

Explanation: The installation of an induction motor is the major reason for the low power factor.

Ques. Which of the following is the maximum transmission voltage substation in India?

550kV
650kV
750kV
850kV

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Ans. c) 750kV

Explanation: 750kV is the maximum transmission voltage substation in India.

Ques. In primary distribution, the voltage is ____ for supplying to the consumers

a step down to 500 kV, 4-phase 3 wire
a step down to 400 kV, 3 - phase 4 wire
a step down to 500 kV, 3-phase 4 wire
a step down to 400 kV, 4 - phase 3 wire

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Ans. b) a step down to 400 kV, 3 - phase 4 wire

Explanation: In primary distribution, the voltage is a step down to 400 kV, 3 - phase 4 wire for supplying the consumers

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