Q. Impedance level of Impatt diodes is generally lower than that of Gunn diodes

View solution

Q. A quarter wave line open circuited at far end behaves as

View solution

Q. Microwave resonators are used in

View solution

Q. Assertion (A): TWT uses a focussing mechanism to prevent the electron beam from spreading.

Reason (R): In a TWT the electron beam has to travel a much longer distance than in klystron.

View solution

Q. In a TWT the amplitude of resultant wave travelling down the helix

View solution

Q. Which of the following is not a travelling wave?

View solution

Q. Both Impatt and Trapatt devices use avalanche effect

View solution

Q. The directive gain of a transmitting antenna is

View solution

Q. A duplexer is used to

View solution

Q. A branched duplexer requires

View solution

Q. In a backward wave oscillator the wave

View solution

Q. A transmission line has Z0 = 300 Ω and ZL = (300 - j300) ohm. The transmission coefficient is

View solution

Q. In a reflex klystron oscillator, repeller electrode is at

View solution

Q. A quarter wave line short circuited at load end behaves as

View solution

Q. A (75 - J50) ohm load is connected to a coaxial of Z0 = 75 ohm at 10 GHz. The best method of matching is to connect

View solution

Q. The width of a radio beam from a 1 m diameter parabolic antenna at 1 GHz is about

View solution

Q. To couple a coaxial line to a parallel wire line it is best to use

View solution

Q. Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line.

Reason (R): A quarter wave transformer is a transmission line of quarter wave length.

View solution

Q. Assertion (A): Magnetron is generally used in n mode.

Reason (R): Frequency for π mode can be easily separated from adjacent modes.

View solution

Q. A balun should have

View solution