Measurement of Resistance - 3 - MCQs with answers
Q1. For the measurement of low resistances, Kelvin’s double bridge has high accuracy becauseA. It has two set of ratio arms which eliminates effect of resistance of connecting lead
B. It has a null indicating galvanometer
C. It has two null indicator
D. It has four sets of ratio arms which eliminates the effect of resistance of connecting lead
View Answer / Hide AnswerANSWER: A. It has two set of ratio arms which eliminates effect of resistance of connecting lead
A. Potentiometer method
B. Ammeter –voltmeter method
C. Ohmmeter
D. Kelvin double bridge method
View Answer / Hide AnswerQ3. In a slide wire potentiometer, for a voltage source of 1.012 V the jockey is kept at 101.2 cm. If the potentiometer has 20 wires of 1 m each and the resistance of wires is 800 ohm, then the value of the working current isA. 15 mA
B. 20 mA
C. 25 mA
D. 27 mA
View Answer / Hide AnswerQ4. When a voltmeter-ammeter method is applied for the measurement of resistance, the voltmeter reads a value of 8.28 V and the ammeter reading is 4.14 mA. Then the value of the resistance will beA. 2 kΩ
B. 2.0 kΩ
C. 2.00 kΩ
D. 2.000 kΩ
View Answer / Hide AnswerQ5. Electrical equipments are generally earthed through an electrode to avoid shocks when someone touches the body of the equipment. The earth resistance is effected byA. Depth of electrodes buried in the soil
B. Shape and material of earth electrodes
C. Specific resistance of the soil surrounding the electrode
D. All of these
View Answer / Hide AnswerQ6. The earth resistance can be measured byA. Fall of potential method
B. Using an earth tester
C. Ducter ohmmeter method
D. Only (a) and (b)
View Answer / Hide AnswerANSWER: D. Only (a) and (b)
A. Ac only
B. Dc only
C. Both ac and dc
D. None of these
View Answer / Hide AnswerQ8. Megger is used for the measurement ofA. Low resistance
B. Medium resistance
C. High resistance
D. Very high resistance
View Answer / Hide AnswerANSWER: D. Very high resistance
