Related Questions

A twoterminal variable resistor is known as a
A Potentiometer
B Thermistor
C Rheostat
D Wiper
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
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°
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
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
A single-phase winding
B two-phase winding
C three-phase winding
D any of the above
Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?
A E = PR
B E = I2R
C I = E/R
D I = ER
E None of the above

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