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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 15
26.
An amplifier with resistive -ve feedback has two left poles in its open loop transfer function. The amplifier
will always be unstable at high frequencies
will be stable for all frequencies
may be unstable, depending on the feedback factor
will oscillate at low frequencies
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Amplification of ultrasonic waves is possible in a piezoelectric semiconductor under applied electric field. The basic phenomenon involved is known as
electrostriction
acousto-optic interaction
acousto-electric interaction
stimulated Brillouin scattering
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
For a junction FET in the pinch off region, as the drain voltage is increased, the drain current
becomes zero
abruptly decrease
abruptly increases
remains constant
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
For a BJT, under the saturation region.
IC = βIB
IC > βIB
IC is independent of other parameter
IC < βIB
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
In which mode of BJT operation are both junctions reverse biased?
Active
Saturation
Cut off
Reverse active
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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