In crossed field tubes, the electron beam traverses the length of the tube and is parallel to the electric field.

Related MCQs

• When the electric field applied to GaAs specimen is less than the threshold electric field, the current in the material:
• Klystron amplifiers have high noise output as compared to crossed field amplifiers.
• In a Gunn diode oscillator, the electron drift velocity was found to be 107 cm/second and the effective length is 20 microns, then the intrinsic frequency is:
• The equivalent circuit of a quartz crystal has LCR arm capacitance of 12nF and inductance of 3mH and parallel arm capacitance of 4nF. Parallel resonant frequency for the circuit is:
• The klystron tube used in a klystron amplifier is a                    type beam amplifier.
• Microwave tubes are power sources themselves at higher frequencies and can be used independently without any other devices.
• An antenna has a field pattern of E (θ) = cos2 θ, θ varies between 0 and 900. Half power beam width of the antenna is:
• The free electron concentration in N-type GaAs is controlled by:
• In a                    oscillator, the RF wave travels along the helix from the collector towards the electron gun.
• An antenna has a field pattern E (θ) =cos θ. cos 2θ. The first null beam width of the antenna is: