In an ac circuit, the maximum and minimum values of power factor can be 2 and 0

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Question
In an ac circuit, the maximum and minimum values of power factor can be
Options
A. 2 and 0
B. 1 and 0
C. 0 and -1
D. 1 and -1

Correct Answer

1 and 0

Explanation

Power factor is maximum and equal to 1 for purely resistive load. Power factor is minimum and equal to zero for purely reactive load.

Networks Analysis and Synthesis problems

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3. The drift velocity of electrons is
Options
A. very small as compared to speed of light
B. equal to speed of light
C. almost equal to speed of light
D. half the speed of light

4. A series RL circuit has . If a voltage 4 sint + 4t is applied, the steady state current will be
Options
A. 4 sin (4t - 45�)
B.
C.
D.

5. A cable has an insulation resistance of 10¹⁰ ohms. If the length is doubled, the insulation resistance will be
Options
A. 2 x 10¹⁰ ?
B. 0.5 x 10¹⁰ ?
C. 10¹⁰ ?
D. 4 x 10¹⁰ ?

6. The synthesis of minimum function was suggested by
Options
A. O'Brune
B. R. Richards
C. Bott and Duffin
D. none of the above

7. Wave A = 100 sin ?t and wave B = 100 cos ?t. Then
Options
A. rms values of the two waves are equal
B. rms values of A is more than that of B
C. rms values of A is less than that of B
D. rms values of the two waves may or may not be equal

8. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
Options
A. Measurement of unknown voltage
B. Measurement of resistance
C. Measurement of unknown current
D. Calibration of voltmeter

9. The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10^-6 N-m on full scale. If B = 1 Wb/m², range of meter is
Options
A. 1 mA
B. 2 mA
C. 3 mA
D. 4 mA

10. Which of the following are needed both for protection and metering?
Options
A. Wattmeters
B. Instrument transformers
C. Energy meters
D. Power factor meters

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