Electronics and Communication Engineering - Measurements and Instrumentation

1. 

The output of a Piezoelectric crystal has

A. low amplitude and low impedance
B. high amplitude and low impedance
C. low amplitude and high impedance
D. high amplitude and high impedance

Answer: Option C

Explanation:

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2. 

The pressure coil of a wattmeter should be connected to the supply side of the current coil when

A. load impedance in high
B. load impedance is low
C. voltage is high
D. voltage is low

Answer: Option A

Explanation:

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3. 

A universal RLC bridge uses

A. Maxwell bridge for measurement of inductance and De Sauty's bridge for measurement of capacitance
B. Maxwell's bridge for measurement of inductance and modified De Sauty bridge for measurement of capacitance
C. Maxwell Wien bridge for measurement of inductance and modified De Sauty bridge for measurement of inductance
D. Maxwell Wien bridge for measurement of inductance and Wien bridge for measurement of capacitance

Answer: Option C

Explanation:

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4. 

If φsh is flux of shunt magnet, φse is flux of series magnet, ish is eddy current due to φse, the torque in an induction wattmeter is proportional to

A. φse ise + φsh ish
B. φsh ise - φse ish
C. φsh ish - φse ise
D. φsh ish + φse ise

Answer: Option B

Explanation:

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5. 

If C is spring constant and θ is deflection, controlling torque is

A.
B. C/θ
C. θ/C
D. C2θ

Answer: Option A

Explanation:

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