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.
Explanation: The balance condition for determining the value of the unknown resistance is given by the relation Rx = R2 R3⁄R1.
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.
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.
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.
6. Standard inductor provides rated inductance directly.
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 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
d) admittance form
Explanation: The bridge balance equation for a Maxwell inductance capacitance bridge consists of admittances. This is due to the connection of a capacitance in parallel across the resistance in one of the ratio arms.
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