Microwave Communication - ECE Questions and Answers

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In a circular waveguide with radius r, the dominant mode is

TM₀₁

TE₀₁

TM₁₁

TE₁₁

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If 'a' is the width of rectangular wave guide and 'λ' is the wave length, then

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A parametric amplifier uses

non linear resistance

non linear reactance

either (a) or (b)

neither (a) nor (b)

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Assertion (A): Impatt diode can be used in both amplifiers and oscillators.

Reason (R): Impatt diode has a low resistance.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

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Which one of the following can be used for amplification of microwave energy?

TWT

Magnetron

Reflex klystron

Gunn diode

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If Z_TE is wave impedance for TE waves, E_d is maximum dielectric strength of insulating material, a and b are the width and height of a rectangular wave guide, the maximum power handling capability P_max for TE₁₀ mode is

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At frequencies of 10 MHz and higher the impedance represented by ground is primarity

resistive

inductive

capacitive

partly resistive and partly capacitive

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A disadvantage of microstrip line as the connections of compared to strip line is that former

do not lend themselves to printed circuit

are more likely to radiate

are bulky

are more expensive and complex

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As frequency increases, the transmission efficiency

decreases

increases

is not affected

either (a) or (c)