Microwave Lab Internal Viva Voce ( Wednesday Batch)

Relation between directivity and effective area of transmitting and receiving antenna is

• D_t A_t=D_r A_r

• D_t A_r=D_r A_t

• A_t D_t=∈D_r A_r

• D_t A_t=∈D_r A_r

What happens to the beam-width of antenna if the frequency of operation is increased?

• Beam-width will decrease

• Beam-width will increase

• Beam-width is independent of frequency

• Beam width may increase or decrease

Half-power beam width is also called as 6-db beam width.

• True

• False

The mode of propagation in a microstrip line is:

• Quasi TEM mode

• TEM mode

• TM mode

• TE mode

Which of the following fed line is connected to patch just like a conducting strip?

• Microstrip line feed

• Coaxial feed

• Aperture coupling

• Proximity Coupling

The Radiation pattern of the horn antenna is

• Uni directional

• Bidirectional

• Omnidirectional

• based on the design

The klystron tube used in a klystron amplifier is a _________ type beam amplifier.

• Linear beam

• Crossed field

________ is a single cavity klystron tube that operates as on oscillator by using a reflector electrode after the cavity.

• Backward wave oscillator

• Reflex klystron

• Travelling wave tube

• Magnetrons

When the electric field applied to GaAs specimen is less than the threshold electric field, the current in the material:

• increases linearly

• decreases linearly

• increases exponentially

• decreases exponentially

Forward attenuation provided by a resonance ferrite isolator is:

• Zero

• Low

• High

• None of the mentioned