Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

A D' Arsonval galvanometer is a
A:
moving coil instrument
B:
moving iron instrument
C:
dynamometer instrument
D:
induction instrument
Answer: A
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The phenomenon of creep occurs in
A:
energy meters
B:
voltmeters
C:
ammeters
D:
wattmeters
Answer: A
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Which of the following transformers has low primary current?
A:
Current transformer
B:
Potential transformer
C:
Distribution transformer
D:
Both (a) and (b)
Answer: B
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To measure an emf by dc potentiometer it is necessary to standardise the potentiometer with the help of a standard cell.
A:
True
B:
False
C:
D:
Answer: A
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Assertion (A): A dc potentiometer measures the true open circuit emf of a source.

Reason (R): At balance point, a dc potentiometer does not draw any current from the source.

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
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