The wave impedance for a non-propagating mode in TE mode is:

A)
K/β
B)
Zero
C)
Imaginary
D)
Non-existing

Correct Answer : Option (C) :   Imaginary

Explanation : Wave impedance of a parallel plate waveguide for TEN modes is k/β. This expression is valid and real only for propagating modes. For non propagating modes, impedance becomes imaginary.

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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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