Electronics and Communication Engineering - Measurements and Instrumentation

1. 

A single phase energy meter operates on induction principle.

A. True
B. False

Answer: Option A

Explanation:

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2. 

The accuracy of measurement using CRO is about

A. ± 0.5%
B. ± 0.05 %
C. ± 1%
D. ± 3%

Answer: Option D

Explanation:

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3. 

The channel required for FM telemetry is

A. same as required for AM telemetry
B. smaller than that required by AM telemetry
C. 100 times that required for AM telemetry
D. 10 times that required for AM telemetry

Answer: Option C

Explanation:

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4. 

Assertion (A): Absolute instruments are used in standard laboratories.

Reason (R): Absolute instruments do not require calibration.

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: Option B

Explanation:

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5. 

Assertion (A): A 3 phase wattmeter consists of two wattmeters mounted in one case.

Reason (R): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method.

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: Option A

Explanation:

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