The reverse voltage applied to a varactor diode

A)
is more than avalanche breakdown voltage
B)
is less than avalanche breakdown voltage
C)
may be more or less than a avalanche breakdown voltage
D)
is very high as compared to avalanche breakdown voltage

Correct Answer : Option (B) :   is less than avalanche breakdown voltage

Explanation : The action of varactor diode is due to the capacitance of depletion layer. The thickness of depletion layer depends on the reverse bias which should not cause breakdown.

Recently Updated in Microwave Communication Questions
In a microwave resistor the wall thickness is made as small as possible to
A)
minimize capacitive effect
B)
reduce inductance
C)
have low value of R
D)
have high value of R

Correct Answer :   minimize capacitive effect

In a klystron amplifier the transit time of electron passing the gap in the cavity should be
A)
less than half cycle
B)
less than one cycle
C)
less than quarter cycle
D)
more than quarter cycle

Correct Answer :   less than quarter cycle

At a frequency equal to cutoff frequency in a rectangular wave guide
A)
the flow of electromagnetic energy is zero
B)
the flow of electromagnetic energy is infinite
C)
the flow of electromagnetic energy is 10% of maximum
D)
the flow of electromagnetic energy is 50% of maximum

Correct Answer :   the flow of electromagnetic energy is infinite

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