Q. TE₀₁ mode of propagation of electromagnetic energy

View solution

Q. Assertion (A): Slotted line is frequently used for microwave measurements.Reason (R): The unknown impedance is mounted at the end of slotted line.

View solution

Q. Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have

View solution

Q. The following components are used to measure power output of a 2 kW TWT amplifier

1. TWT
2. Low pass/High pass filter
3. Low power 20 dB attenuator
4. 40 dB directional coupler with matched load
5. Power meter

The correct sequence of connections of these components is:

View solution

Q. Which part of radio spectrum is more crowded?

View solution

Q. The most commonly used magnetron is

View solution

Q. The effect of earth's magnetic field on radiowaves is minimum when

View solution

Q. A line of characteristic impedance Z₀ branches into two line each with characteristic impedance Z₀. The refracted voltage is

View solution

Q. The resistance values of a PIN diode under positive bias and negative bias respectively are about

View solution

Q. A PIN diode can be used

View solution

Q. What is the numerical aperture an optical fiber when critical angle is 30°?

View solution

Q. A line of length slightly less than λ/4 and short circuited at far end behaves as

View solution

Q. In TE₁₀ mode of rectangular waveguide

View solution

Q. Reflection from the object to be measured is significant only when the wavelength is

View solution

Q. The speed at which axial electric field due to signal advances in a TWT is equal to

View solution

Q. Slotted line can be used for measurement of high frequencies

View solution

Q. In a waveguide the dielectric region is generally

View solution

Q. A line is excited by a 100 V, 200 ohm source and is terminated by 100 Ω resistance. If the voltage on line reaches steady value in 80 ns, the natural resonant frequency is

View solution

Q. A line of length slightly longer than λ/4 and open circuited at far end behaves as

View solution

Q. Klystron amplifier is not used to amplifier very weak microwave signals due to

View solution