Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

The most commonly used moving iron instruments are
A:
repulsion type
B:
attraction type
C:
a combination of attraction and repulsion type
D:
none of the above
Answer: A

Repulsion type have better accuracy.

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Magnetic deflection is inversely proportional to
A:
voltage
B:
(voltage)0.5
C:
(voltage)1.5
D:
(voltage)2
Answer: B

where VA is the potential difference between anode and cathode.

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The scale of dynamometer wattmeter is non linear.
A:
True
B:
False
C:
D:
Answer: B

It is linear.

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Assertion (A): A low power factor wattmeter has special constructional features to ensure accurate measurement.

Reason (R): Extension of wattmeter range in dc circuit can be easily done by using current and potential transformer.

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
Answer: C

CT and PT cannot be used in dc.

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The use of thermocouple meters for ac measurement leads to a scale which is
A:
linear
B:
square law
C:
logarithmic
D:
exponential
Answer: B

Thermocouple meter is based on heating effect which varies as I2.

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