**Ques.1. ** The magnitude of (|E| / |H|) in a uniform plane wave is:

- √µε
- Infinity
- $\sqrt {\frac{\mu }{ \in }}$
- 1

**Ques.2.** For transverse electric waves between parallel plates, the lowest value of m, without making all the field components zero, is equal to

- 3
- 2
- 1
- 0

**Ques.3.** The dispersion equation of a waveguide, which relates the wavenumber k to the frequency ω, is $k\left( \omega \right) = \left( {1/\:c} \right)\:\sqrt {{\omega ^2} – \omega _o^2}$ where the speed of light c = 3 × 10^{8} m/s, and ω_{o} is a constant. If the group velocity is 2 × 10^{8} m/s, then the phase velocity is

**Ques.4.** The phase velocity of waves propagating in a hollow metal waveguide is

**Ques.5.** A rectangular waveguide of width w and height h has cut-off frequencies for TE_{10 }and TE_{11} modes in the ratio 1 : 2. The aspect ratio w/h, rounded off to two decimal places, is __________.

- 2.89
- 1.73
- 5.42
- 0

**Ques.6.** Transverse Electromagnetic waves are characterized by

**Ques.7.** The cut-off frequency of TE01 mode of an air-filled rectangular waveguide having inner dimensions a cm × b cm (a > b) is twice that of the dominant TE10 mode. When the waveguide is operated at a frequency that is 25% higher than the cut-off frequency of the dominant mode, the guide wavelength is found to be 4 cm. The value of b (in cm, correct to two decimal places) is _______.

- 3
- 0.5
- 0.75
- 2.75

**Ques.8.** As the wave frequency approaches to the cut-off frequency of waveguide, the correct statement is:

**Ques.9.** The velocity of electromagnetic waves in a dielectric medium with relative permittivity of 4 will

**Ques.10.** Standard air-filled rectangular waveguides of dimensions a = 2.29 cm and b = 1.02 cm are designed for radar applications. It is desired that these waveguides operate only in the dominant TE10 mode with the operating frequency at least 25% above the cutoff frequency of the TE10 mode but not higher than 95% of the next higher cutoff frequency. The range of the allowable operating frequency f is

**Ques.11.** For a parallel plate transmission line, let v be the speed of propagation and Z be the characteristic impedance. Neglecting fringe effects, a reduction of spacing between the plates by a factor of two results in

**Ques.12.** A standard air-filled rectangular waveguide with dimensions a = 8 cm, b = 4cm, operates at 3.4 GHz, For the dominant mode of wave propagation, the phase velocity of the signal is vp. The value (rounded off two decimal places) of vp / C, where C denotes the velocity of light, is _____

- 1.98
- 3.5
- 4.5
- 0.6

**Ques.13.** A rectangle waveguide of internal dimensions (a = 3 cm and b = 1 cm) is to be operated at TE11 mode. The minimum operating frequency is: