250+ TOP MCQs on Capacitance Comparison Bridge and Answers

Electrical Measurements & Measuring Instruments Multiple Choice Questions on “Capacitance Comparison Bridge”.

1. In a capacitance bridge, the arms are _________
a) resistive
b) capacitive
c) inductive
d) mixture of resistance, capacitance and inductance
Clarification: The capacitance bridge is mainly used for the measurement of unknown capacitance. The ratio arms in a capacitance bridge are resistive in nature.

2. How is the bridge balanced?
a) using resistance R1
b) using resistance R3
c) through capacitance C3
d) through capacitance Cx
Clarification: Bridge balance is obtained by varying the resistance R3. At balance we get the value of the unknown resistance as Rx = R1 R3R2.

3. Impedance Z4 consists of _________
a) resistance Rx
b) capacitance Cx
c) combination of capacitance Cx and resistance Rx
d) consists of a detector
Clarification: Ratio arm Z4 consists of the unknown impedance. Impedance Z4 consists of capacitance Cx in series with a leakage resistance Rx.

4. Impedance Z3 consists of_________
a) resistance R3
b) capacitance C3
c) vibration galvanometer
d) capacitance C3 in series with resistance R3
Clarification: Impedance usually refers to the combination of resistance and either capacitance or inductance. As we are considering the case of capacitance measurement, impedance Z3 comprises capacitance C3 in series with resistance R3.

5. Unknown capacitance value is obtained by _________
a) comparison with standard
b) using a tuned detector
c) using capacitance of other ratio arms
d) using a vibration galvanometer
Clarification: Tuned circuit is used for detecting balance condition. Vibration galvanometer is used for the same purpose. Unknown value of capacitance is obtained by comparing it with a standard value.

6. Unknown resistance is obtained by using which of the following relation?
a) Rx = (frac{R_1 R_3}{R_2})
b) Rx = (frac{R_2 R_3}{R_1})
c) Rx = (frac{R_2 R_1}{R_3})
d) Rx = (frac{R_2}{R_1})
Clarification: The value of the unknown resistance is obtained by using the relation
Rx = (frac{R_2 R_3}{R_1})
at balance condition.

7. Unknown capacitance is found by using which of the following relation?
a) Cx = (frac{C_3 R_2}{R_1})
b) Cx = (frac{C_3}{R_2})
c) Cx = (frac{C_3 R_1}{R_2})
d) Cx = (frac{R_1}{R_2})