An ideal regulated power supply is one which has voltage regulation of ___________

A power supply which has voltage regulation of ___________ is unregulated power supply

A

0%

B

5%

C

10%

D

8%

Commercial power supplies have voltage regulation ___________

A

of 10%

B

of 15%

C

of 25%

D

within 1%

Which of the following is used for regulated electric supply ?

A

Zener diode

B

Junction diode

C

Gun diode

D

Tunnel diode

The voltage regulation in magnetic amplifier type voltage regulator is effected by

A

Electromagnetic induction

B

Varying the resistance

C

Varying the reactance

D

Variable transformer

In an unregulated power supply, if input a.c. voltage increases, the output voltage .

A

Increases

B

Decreases

C

Remains the same

D

None of the above

In an SCR circuit the supply voltage is generally ___________ that of breakover voltage

A

Equal to

B

Less than

C

Greater than

D

None of the above

Minimum voltage regulation occurs when the power factor of the load is

A

unity

B

lagging

C

leading

D

zero

If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor

A

will become more

B

will become less

C

will remain unchanged

D

none of the above.

If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor

A

become more

B

become less

C

remain constant

D

none of the above

A Zener diode utilises ___________ characteristic for voltage regulation

A

Forward

B

Reverse

C

Both forward and reverse

D

None of the above

An ideal regulated power supply is one which has voltage regulation of ___________

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