The frequency of oscillation in a backward wave oscillator can be chan – McqOptions

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1.	The frequency of oscillation in a backward wave oscillator can be changed by
A.	varying the voltage which controls beam velocity
B.	varying the beam current
C.	both by varying the beam current and by light varying the voltage which controls beam velocity
D.	changing the rate of thermionic emission
Answer» B. varying the beam current

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