Question: When a potentiometer is used for measurement of voltage of an unknown source , the power consumed in the circuit of the unknown source under null conditions
Answer:
MCQ: When a potentiometer is used for measurement of voltage of an unknown source , the power consumed in the circuit of the unknown source under null conditions
Correct Answer:
A. Is very high
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Related Questions
- 1. Standardization of potentiometers is done in order that, they become
- 2. A Crompton’s Potentiometer is provided with a dial resistor having 15 steps of 10Ω each and a slide wire of 10 Ω resistances the slide wire is divided into 100 divisions and one fifth of a division can be read with certainty. The working current of potentiometers is 10mA. The range and resolution of the potentiometer are respectively :
- 3. A dual range Crompton’s potentiometer is provided with a dial resistor having 15 steps of 10 Ω each and a slide wire of 10 Ω resistances. The ranges are X1 and X0.1. The current in the potentiometer measuring circuit 10mA on the X1 scale. The slide wire has 100 divisions and one fifth of a scale division can be read with certainty. What is the current drawn from the battery and the resolution of the instrument on X0.1 scale range?
- 4. Brook’s deflectional potentiometer is used when the unknown voltage :
- 5. A volt-ratio box is designed with a resistance 100 Ω/V. it has input terminals of 300V, 150V and 75 V, and an output terminal of 1.5 V which is connected to the potentiometer. Supposing a voltage of 270V is connected to the 300 V terminals, what is voltage indicated by the potentiometer and what is the power consumption under null conditions?
- 6. The standardization of a.c potentiometer is done by
- 7. The reading of polar type a.c potentiometer when measuring the reactance of a coil areI = 12 <strong>∠</strong>13.8° , V =27.8 <strong>∠</strong>29.7°.The reactance of the coil is :
- 8. A Coordinate type potentiometer is used for determination of impedance of a coil and the results obtained are: voltage across 1Ω resistance in series with coil, 0.24 V on in phase dial and -0.09 on quadrature dial.The resistance of the coil is:
- 9. The transfer instrument which is used for standardisation of a polar-type ac potentiometer is
- 10. A dc potentiometer is designed to measure up to about 2 volts with a slide wire of 800 mm. A standard cell of emf 1.18 volt obtains balance at 600 mm. a test cell is seen to obtained balance at 680 mm. The emf of the test cell is
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