Instrumentation Transducers

Self Balancing Potentiometers

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Power consumption of unknown source connected will be _____________
Very high
Very low
Zero ideally
Always constant
Explanation:
Indication of null position in galvanometer means zero current is drawn be connected source.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following device is used for calibration of a potentiometer?
Electrochemical cell
Galvanometer
Variable dc source
All of the mentioned
Explanation:
Electrochemical cell of known potential is used for calibration of a potentiometer, ammeter is also used for this purpose.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which of the following devices cannot be used potentiometer as calibrating device?
Watt meter
Energy meter
Voltmeter
All of the mentioned
Explanation:
Watt meter, voltmeter and energy meter cannot use a potentiometer as calibrating device.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
A potentiometer cannot be used for calibration of ammeter.
True
False
Explanation:
For the calibration of ammeter, potentiometers can be used since it indicates current drawn by the externally connected device.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which of the following cannot be measured using potentiometer?
DC voltage
Temperature
Resistance
None of the mentioned
Explanation:
Potentiometer can be arranged to measure different quantities like DC voltage, resistance, and temperature (using thermocouple potentiometer).
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Galvanometer used should be calibrated first.
True
False
Explanation:
Calibration of galvanometer is not needed since its only purpose is to display a null condition.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Standardization of potentiometer is used for ________________
Accuracy
Accuracy in measurement
Use of low voltage sources
None of the mentioned
Explanation:
Standardization of potentiometers are done for accuracy in measurement, and it is carried out using electrochemical cells of known potential.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is not possible?
Constant current potentiometer
Constant resistance potentiometer
Thermocouple potentiometer
None of the mentioned
Explanation:
Constant current, constant resistance and thermocouple potentiometers are different arrangements of potentiometers for measuring different parameters.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
At null position, galvanometer reading will be _______________
Maximum
Zero
Unchanged for further reading
None
Explanation:
Null position is in which current drawn will be zero and galvanometer shows zero reading.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Galvanometer is used for _________________
Calibration of potentiometer
Indication of null position
Providing stability
All of the mentioned
Explanation:
Only use of galvanometer in potentiometer circuit is for the indication of null position.