Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

The emf of a Weston cell is 1.286 V.
A:
True
B:
False
C:
D:
Answer: B

It is 1.01859.

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Assertion (A): A universal RLC bridge has a battery and also a high frequency ac source.

Reason (R): RLC bridge uses a Wienbridge arrangement for measuring 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

Modified De sauty bridge is used to measure capacitance.

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In household energy meters the flux of series magnet is in phase with current but the flux of shunt magnet lags the voltage by 88Ā°. The reading of energy meters
A:
will be correct
B:
will have a negative error
C:
will have a positive error
D:
may have positive or negative error
Answer: B

Since angle is less than 90Ā°, reading will be less. Therefore error is negative and correction is positive.

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In figure, Za = 100āˆ 50Ā°, Zb = 300āˆ -90Ā° and Zc = 200āˆ 0Ā°. For balanced condition, Zd will be
A:
600āˆ  - 40Ā°
B:
600āˆ 140Ā°
C:
600āˆ  - 140Ā°
D:
150āˆ 140Ā°
Answer: C

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Two ammeters A and B are connected in parallel in a circuit carrying 100 A. Their resistances are 0.8 mĪ©. Their readings will be.
A:
55.56 and 44.44 A respectively
B:
44.44 A and 55.56 A respectively
C:
60 A and 40 A respectively
D:
40 A and 60 A respectively
Answer: A

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