In a vacuum tube, the transit time of electron between cathode and anode is important at

Electronics and Communication Engineering (ECE) : Microwave Communication - Quiz(MCQ)

low frequencies

high frequencies

Both (A) and (B)

frequencies which are neither very low nor very high

Correct Answer : Option (B) : high frequencies

Explanation : At high frequencies transit time is large as compared to the period of microwave signal.

Recently Updated in Microwave Communication Questions

In a microwave resistor the wall thickness is made as small as possible to

minimize capacitive effect

reduce inductance

have low value of R

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

less than half cycle

less than one cycle

less than quarter cycle

more than quarter cycle

Correct Answer : less than quarter cycle

At a frequency equal to cutoff frequency in a rectangular wave guide

the flow of electromagnetic energy is zero

the flow of electromagnetic energy is infinite

the flow of electromagnetic energy is 10% of maximum

the flow of electromagnetic energy is 50% of maximum

Correct Answer : the flow of electromagnetic energy is infinite