Q. What is the significance of a megger with respect to high resistance?

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Q. How is the megger calibrated?

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Q. What is earthing?

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Q. What is an earth electrode?

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Q. Earth electrode provides ____________

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Q. How is the condition of an earth electrode measured?

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Q. In a three phase system, the neutral is _________

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Q. Earthing is used as return conductor in telephone lines and for traction work.

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Q. Earthing does not help in protecting the equipment.

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Q. After earthing, the different parts of an electrical machinery are at _________

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Q. Connection of the various parts of a circuit to earth has a _________

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Q. Specific resistance of soil is _________

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Q. The readings of polar type potentiometer are I = 12.4∠27.5°, V = 31.5∠38.4°. Then, reactance of the coil will be ________

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Q. The voltage drop across a standard resistor of 0.2 Ω is balanced at 83 cm. Find the magnitude of the current, if the standard cell emf of 1.53 V is balanced at 42 m.

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Q. Low resistance is measured by ___________

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Q. The resistance can be measured most accurately by _________

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Q. A slide wire potentiometer has 10 wires of 2 m each. With the help of a standard voltage source of 1.045 V, it is standardized by keeping the jockey at 104.5 cm. If the resistance of potentiometer wires is 2000 Ω, then the value of working current is?

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Q. Which of the following method is used for the measurement of Medium Resistance?

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Q. A resistor of 10 kΩ with the tolerance of 5% is connected in parallel with 5 kΩ resistors of 10% tolerance. What is the tolerance limit for a parallel network?

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Q. A 0-400V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 250 V. Calculate the limiting error in percentage.

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