Q. If ρv is reflection coefficient and VSWR is voltage standing wave ratio, then

View solution

Q. In terms of R, L, G and C the propagation constant γ of a transmission line is

View solution

Q. In the given figure power meters at A and B indicate 1 mW and 110 μW respectively. VSWR of line is

View solution

Q. Which of the following are true for magic tee in the given figure select the answer as per given codes

1. S13 = S23
2. S14 = S24
3. S12 = 0
4. S34 = 0

View solution

Q. The arrangement in the given figure is a hybid T. If 100 mW fed at port 1, the power reflected back at port 1 is

View solution

Q. If wavelength in free space is λ₀ wavelength in insulator λ, μr is relative permittivity or insulator and ∈r is relative permittivity or insulator, then

View solution

Q. In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is

View solution

Q. The scattering matrix of magic tee is

View solution

Q. Guide wavelength (λg), cutoff wavelength (λc) and free space wavelength (λ₀) of a waveguide are related as

View solution

Q. Consider the following statements about directional coupler shown in the figure:

1. Ports 1 and 2 are decouple
2. Ports 3 and 4 are decoupled
3. Pots 1 and 3 are decoupled
4. Ports 1 and 4 are decoupled

Which of the above statements are correct?

View solution

Q. Two identical hybrid tees are joined as shown in the given figure. If 16 mW power is fed into port 1, the power output at ports 2 , 3, 1', 2', 3' respectively is

View solution

Q. If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then

View solution

Q. Which of the following lines is non-radiating?

View solution

Q. Assertion (A): The impedance of a matched load is equal to characteristic impedance of line.

Reason (R): A matched termination absorbs all the power incident on it.

View solution

Q. Skin effect is more pronounced at high frequencies.

View solution

Q. Assertion (A): The phenomenon of differential mobility is called transferred electron effect.

Reason (R): GaAs exhibits transferred electron effect.

View solution

Q. Which of the following devices uses a helix?

View solution

Q. The action of backward wave oscillator is similar to that of

View solution

Q. Assertion (A): Artificial transmission lines are frequently used in laboratories.

Reason (R): An artificial transmission line can be used to represent an actual line and can also be used as a delay circuit, as attenuator, as filter network etc.

View solution

Q. In a backward wave oscillator the wave travelling along the line winds itself back and forth

View solution