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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 10
1.
A direct current can be measured
directly by dc potentiometer
by dc potentiometer in conjunction with a standard resistance
by dc potentiometer in conjunction with volt ratio box
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Consider the following galvanometers
  1. D'Arsonval
  2. Ballistic
  3. Vibration
Which of these are permanent magnet moving coil instruments?
1 and 2 only
1, 2 and 3
2 and 3 only
1 and 3 only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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
1 kHz
2 kHz
4 kHz
8 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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