Assertion (A): De sauty's bridge is suitable only for pure capacitor. Reason (R)

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Question
Assertion (A): De sauty's bridge is suitable only for pure capacitor.
Reason (R): Capacitors are mostly perfect.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

Correct Answer

A is true R is false

Explanation

Capacitors are mostly imperfect.

Measurements and Instrumentation problems

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1. A moving coil instrument has a resistance of 0.6 ? and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be
Options
A. 0.6 ?
B. 0.06 ?
C. 0.1 ?
D. 0.004 ?

2. It is required to measure angular position. Out of the transducers
1. Circular potentiometer
2. LVDT
3. E pick up
4. Synchro
The proper devices are
Options
A. 1, 2, 3, 4
B. 2 and 3
C. 1, 2, 4
D. 1 and 4

3. A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is
Options
A. 1 V
B. 0.01 V
C. 1 mV
D. 1 ?V

4. The speed transducer using a drag cup rotor has the main advantage of
Options
A. very high accuracy
B. low energy requirement
C. cheap construction
D. all of the above

5. Two resistors R₁ = 36 ? � 5% and R₂ = 75 ? � 5% are connected in series. The total resistance is
Options
A. 111 � 0 ?
B. 111 � 2.778 ?
C. 111 � 5.55 ?
D. 111 � 7.23 ?

6. In figure, Z₁ = 200?60� ?, Z₂ = 400? - 90� ?, Z₃ = 300?0�. Then Z₄ for bridge to be balanced is
Options
A. 150?30� ?
B. 400? - 90� ?
C. 300?90� ?
D. 600? - 150� ?

7. A moving coil instrument has a resistance of 0.5 ? and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be
Options
A. 0.004 ?
B. 0.005 ?
C. 0.05 ?
D. 0.1 ?

9. A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is
Options
A. 1 mV/pC
B. 1.5 mV/pC
C. 2.5 mV/pC
D. 4 mV/pC

10. An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is
Options
A. 2%
B. 2.5%
C. 4%
D. 5%

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