Electronics and Communication Engineering - Measurements and Instrumentation

1. 

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: Option B

Explanation:

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2. 

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: Option B

Explanation:

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3. 

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: Option B

Explanation:

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4. 

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: Option B

Explanation:

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5. 

A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

A. 1 kHz
B. 2 kHz
C. 4 kHz
D. 8 kHz

Answer: Option C

Explanation:

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