The modes of wave propagation that a parallel plate waveguide can support are:

A)
TM, TE modes
B)
TEM, TE modes
C)
TEM, TE, TM modes
D)
TEM, TM modes

Correct Answer : Option (C) :   TEM, TE, TM modes

Explanation : Parallel plate waveguide is the simplest type of waveguide that can support TE and TM modes. It can also support a TEM mode since it is formed from two flat conducting plates.

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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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