Q. Read the following statements about TWT

1. It uses thermionic emission.
2. It uses an attenuater.
3. It is inherently a resonant device.
4. It has broad bandwidth.

Which of the above are correct?

View solution

Q. If a line having Z₀ = 300 ∠ 0 W is short circuited at far end, VSWR is

View solution

Q. A klystron amplifier generally uses Pierce gun

View solution

Q. If a short line is terminated in characteristic impedance it behaves as an infinite line.

View solution

Q. Ga As exhibits negative differential mobility

View solution

Q. Consider the following statements:

1. Bunching of electrons occurs in two cavity klystron amplifier.
2. Bunching of electrons occurs in multi cavity klystron amplifier.
3. Bunching of electrons occurs in reflex cavity klystron amplifier.

Which of the above statements are correct?

View solution

Q. Assertion (A): For high frequency lines inductive reactance is very high as compared to ac resistance.

Reason (R): Due to skin effect ac resistance of line is higher than dc resistance.

View solution

Q. Consider the following applications

1. Switch
2. Attenuator
3. Phase shifter
4. Oscillator

In which of the above can a PIN diode be used?

View solution

Q. Out of modes TE₂₀ and TE₃₀ of propagation of electromagnetic engery

View solution

Q. A TE₁₀ rectangular waveguide is to be designed for operation over 25-35 GHz and the band centre is 1.5 times the cutoff frequency. The dimension of broadside is

View solution

Q. In a klystron amplifier the force on all electrons

View solution

Q. If load impedance ZL >> Z0, then

View solution

Q. The inductance of a twin feeder used to connect antenna to TV receiver is about

View solution

Q. Assertion (A): Impatt diode is an avalanche diode.

Reason (R): Avalanche breakdown phenomenon occurs when a p-n junction is reverse biased.

View solution

Q. A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is

View solution

Q. In a line with finite attenuation

View solution

Q. The electric field in a TWT due to applied signal

View solution

Q. A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is

View solution

Q. The word 'LORAN' means

View solution

Q. The duty cycle of a radar transmitter is equal to

View solution