Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.

Reason (R): The time base generator develops a saw tooth voltage.

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: B
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Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.

Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.

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: B
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Consider the following galvanometers
  1. D'Arsonval
  2. Ballistic
  3. Vibration
Which of these are permanent magnet moving coil instruments?
A:
1 and 2 only
B:
1, 2 and 3
C:
2 and 3 only
D:
1 and 3 only
Answer: B
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A direct current can be measured
A:
directly by dc potentiometer
B:
by dc potentiometer in conjunction with a standard resistance
C:
by dc potentiometer in conjunction with volt ratio box
D:
none of the above
Answer: B
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In a megger the moving coil meter has a permanent magnet.
A:
True
B:
False
C:
D:
Answer: A
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