Q. If VSWR is infinite, the transmission line is terminated in

View solution

Q. The semiconductor diode which can be used in switching circuit in microwave range is

View solution

Q. A line has an attenuation of 0.054 Np/m. The attenuation in decibels is

View solution

Q. If a line is open circuited Zin = Z0 tanh (gl).

View solution

Q. A reflex klystron oscillator uses

View solution

Q. Which one of the following is not a negative resistance device?

View solution

Q. Microwave links are typically 50 km apart

View solution

Q. For matching over a range of frequencies in a transmission line it is best to use

View solution

Q. Assertion (A): In the interaction region of magnetron an electron is subjected to three forces: force due to electric field, force due to magnetic field and centrifugal force.

Reason (R): The mechanism of generation of microwaves, in a magnetron, involves interaction of electromagnetic fields with electrons moving in static electric and magnetic fields oriented at right angles to each other.

View solution

Q. Which of the following is wrong for a magic used to tee?

View solution

Q. Roughly the time required for microwave cooking as compared to conventional cooking is

View solution

Q. If the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of

View solution

Q. Which mode has the lowest cut off frequency in circular wave guides?

View solution

Q. Assertion (A): Klystron amplifiers use one or more intermediate cavities in addition to buncher and catcher cavity.

Reason (R): When one or more intermediate cavities are used the bandwidth can be increased.

View solution

Q. A wave Em cos (bx - ωt) is a backward wave.

View solution

Q. In a circular waveguide TE₂₁ mode has lowest cutoff frequency

View solution

Q. The number of TV channels which can be accommodated in a spectrum of 300 MHz is about

View solution

Q. The noise figure of multicavity klystron amplifier is very low

View solution

Q. Assertion (A): The velocity of electromagnetic waves on overhead lines and coaxial cables is the same.

Reason (R): Free space has an intrinsic impedance of 377 ohms.

View solution

Q. A cavity resonator is

View solution