AC Bridges - 3 - MCQs with answers

AC Bridges - 3 - MCQs with answers

Q1. The Ac Bridge which is used for the measurement of frequency is

A. Schering bridge
B. Wien bridge
C. Hay’s bridge
D. Anderson bridge

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Q2. The Wien’s bridges is suitable for the measurement of frequency of the range of

A. Less than 100 Hz
B. 100 Hz to 100 kHz
C. 1 kHz to 100 MHz
D. More than 100 MHz

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Q3. For the measurement of unknown inductance in terms of known capacitance, the suitable ac bridges are

A. Maxwell and Schering bridge
B. Maxwell and Wien’s bridge
C. Maxwell and hay’s bridge
D. Hay’s and Wien’s bridge

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Q4. If a capacitor is connected across a portion of resistance of multiplier of the wattmeter then the pressure coil of the circuit becomes

A. Inductive
B. Non inductive
C. Capacitive
D. Non capacitive

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Q5. Shielding of the capacitor is done to

A. Make the value of capacitor definite
B. Balance the bridge without any problem
C. Both (a) and (b)
D. None of these

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Q6. In ac bridges, the Wagner earth devices are used to

A. Remove all the earth capacitances from the bridge circuit
B. Remove harmonics
C. Reduce error caused by stray electric field
D. All of these

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Q7. At 2 MHz, the resonance is obtained with a resonating capacitance value of 12 pF and at 400 kHz, the resonance is obtained with resonating capacitance value of 320 pF. Then the self capacitance of the coil is

A. 0.62 pF
B. 0.83 pF
C. 1.2 pF
D. 1.5 pF

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Q8. The given figure shows an ac bridge which is balanced at 100 Hz.



Fig : AC Bridge

The quality factor of the coil will be

A. 149
B. 159
C. 169
D. 189

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