Question

For the measurement of high resistances following methods are used:

1. Loss of Charge Method

2. Direct Deflection Method

3. Substitution Method

Which of the following is/are correct?

1. 1 and 2
2. 2 and 3
3. Only 1
4. 1 and 3

Answer 1

Correct Answer - Option 1 : 1 and 2

The Measurement of Resistance according to classification is shown below:

	Low Resistance	Medium Resistance	High Resistance
Value	R ≤ 1 Ω	1 to 100 kΩ	R > 100 kΩ
Example	Ammeter internal resistance, Electrical machine winding resistance, Earthing resistance, Diode FB resistance, etc	DC Machine shunt winding resistance, heater coil resistance, Human body under normal condition resistance, etc	Cable insulation resistance, winding insulation resistance, Diode RB resistance etc
Method of Measurement	1. Potentiometer 2. Kelvin Bridge	1. VA Method 2. Substitution rule 3. Wheatstone Bridge 4. Ohm-meter	1. Loss of charge Method 2. Megger 3. Mega-ohm bridge 4. Direct deflection