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

Q. In a klystron amplifier the bunching effect

View solution

Q. Which of the following modes of transmission will not be supported by a rectangular waveguide?

View solution

Q. In a circular waveguide with radius r, the dominant mode is

View solution

Q. If 'a' is the width of rectangular wave guide and 'λ' is the wave length, then

View solution

Q. A parametric amplifier uses

View solution

Q. Assertion (A): Impatt diode can be used in both amplifiers and oscillators.

Reason (R): Impatt diode has a low resistance.

View solution

Q. Which one of the following can be used for amplification of microwave energy?

View solution

Q. At frequencies of 10 MHz and higher the impedance represented by ground is primarity

View solution

Q. A disadvantage of microstrip line as the connections of compared to strip line is that former

View solution

Q. As frequency increases, the transmission efficiency

View solution

Q. A circular polarizer converts a linearly polarized wave into a circularly polarised wave.

View solution

Q. If D is diameter of circular waveguide the cutoff wave-length for TE₁₁ mode is equal to

View solution

Q. The external magnetic field in a magnetron is such that lines are

View solution

Q. Varactor diodes use

View solution

Q. A circular waveguide carries TE₁₁ mode whole radial electric field is given by

Er = E₀j₁(r) sin Φ V/m
where r is radial distance in cm from the axis

The cut off wavelength is

View solution

Q. The domain mode in rectangular waveguide is

View solution