Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

A capacitance transducer can be used to measure
A:
thickness of sheet
B:
displacement
C:
level of fluids
D:
all of the above
Answer: D

In all these, change of capacitance occurs.

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The resistance of a dc galvanometer is 20 Ω. A current of 10 mA causes full scale deflection. To convert it into 0-300 V voltmeter, we have to use a series resistance of
A:
30000 Ω
B:
29980 Ω
C:
6000 Ω
D:
15 Ω
Answer: B

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Current density has the dimensions
A:
IL
B:
IL-2
C:
IL-3
D:
I2L-2
Answer: B

Current density = current/area = IL-2.

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Assertion (A): A semiconductor strain gauge is more accurate than a resistance strain gauge.

Reason (R): The gauge factor of a semiconductor strain gauge is about 100 where as the gauge factor of a resistance strain gauge is only about 2.

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: A

Higher gauge factor results in better accuracy.

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Assertion (A): Maxwell bridge is for measuring inductance of medium magnitude.

Reason (R): In Maxwell's bridge the unknown inductance is measured by comparing it with a capacitance.

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

Maxwell bridge does not use a capacitor.

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