A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is conn

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Question
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

Correct Answer

2.5 mV/pC

Explanation

A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge am

.

Measurements and Instrumentation problems

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2. 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 ?

3. 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� ?

4. 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

5. 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 ?

6. 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%

7. An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
Options
A. 0.1 V/mm
B. 0.5 V/mm
C. 1 V/mm
D. 5 V/mm

8. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
Options
A. when power factor is less than 0.5 lagging
B. when power factor is greater than 0.5 lagging
C. when power factor is less than 0.5
D. when power factor is unity

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