# Electrical Measurements Questions and Answers – Maxwell’s Inductance Capacitance Bridge

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Maxwell’s Inductance Capacitance Bridge”.

1. Maxwell inductance capacitance bridge can be used for _________
a) measurement of inductance
b) measurement of capacitance and inductance
c) measurement of resistance
d) measurement of voltage and current

Explanation: A Maxwell inductance capacitance bridge is used for the measurement of inductance by making comparison with a standard capacitance value. Voltmeter is used to measure voltage, while an ammeter is used to measure current.

2. Balance equation for computing the unknown resistance is?
a) Rx = $$\frac{R_2}{R_1}$$
b) Rx = $$\frac{R_2 R_3}{R_1}$$
c) Rx = $$\frac{R_3}{R_1}$$
d) Rx = $$\frac{1}{R_1}$$

Explanation: The balance condition for determining the value of the unknown resistance is given by the relation Rx = $$\frac{R_2 R_3}{R_1}$$
where, R1 and R3 are variable resistances and R2 is a fixed resistance.

3. Balance equation for computing the value of the unknown inductance is?
a) Lx = R2 R3
b) Lx = R2 C1
c) Lx = R2 R3 C1
d) Lx = R3 C1

Explanation: The balance equation for determining the value of the unknown inductance is given by the relation Lx= R2 R3 C1.
where,
C1 is the capacitance across the resistance R1
R3 is a variable resistance and R2 is a fixed resistance.

4. Quality factor of the circuit is given by _________
a) Q = ωC1
b) Q = ωR1
c) Q = ω
d) Q = ωR1 C1

Explanation: The quality factor of a Maxwell inductance capacitance bridge is given by the relation

5. Standard inductor requires no shielding.
a) True
b) False

Explanation: Stray magnetic fields are present in a circuit consisting of inductances and capacitances. In order to eliminate the stray magnetic fields proper shielding is required for the standard inductance.
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6. Standard inductor provides rated inductance directly.
a) True
b) False

Explanation: When the current flow through the standard inductance is adjusted precisely, it provides its rated value of inductance.

7. What is the significance of capacitors in a Maxwell bridge?
a) they are used to block dc
b) they are used to block ac
c) they are cheap
d) they are expensive

Explanation: In a Maxwell inductance capacitance bridge, the capacitors are cheaper when compared to a stable and accurate standard value of inductors.

8. The bridge balance equation can be written in _________
a) impedance form
b) resistance form
c) conductance form

Explanation: The bridge balance equation for a Maxwell inductance capacitance bridge consists of admittances. This is due to the connection of capacitance in parallel across the resistance in one of the ratio arms.

Sanfoundry Global Education & Learning Series – Electrical Measurements.