The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

A

out of phase by 90°

B

out of phase by 60°

C

out of phase by 30°

D

out of phase by 0°

A phase shifting transformer is used in conjunction with

A

D.C. potentiometer

B

Drysdale potentiometer

C

co-ordinate potentiometer

D

Crompton potentiometer

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken

A

From a source which is not the same as the unknown voltage

B

From a battery

C

From the same source as the unknown voltage

D

Any of the above

To measure a resistance with the help of a potentiometer it is

A

necessary to standardise the potentiometer

B

not necessary to standardise the potentiometer

C

necessary to use a volt ratio box in conjunction with the potentiometer

D

none of the above

In order to achieve high accuracy, the slide wire of a potentiometer should be

A

as long as possible

B

as short as possible

C

neither too small not too large

D

very thick

Basically a potentiometer is a device for

A

comparing two voltages

B

measuring a current

C

comparing two currents

D

measuring a voltage

E

none of the above

A potentiometer may be used for

A

measurement of resistance

B

measurement of current

C

calibration of ammeter

D

calibration of voltmeter

E

all of the above

A rheostat differs from potentiometer in the respect that it

A

Has lower wattage rating

B

Has higher wattage rating

C

Has large number of turns

D

Offers large number of tapping

A potentiometer is a twoterminal variable resistor.

A

True

B

False

Power amplifiers generally use transformer coupling because transformer per-mits

A

Cooling of the circuit

B

Impedance matching

C

Distortionless output

D

Good frequency response

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

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