# Rectangular Waveguide MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Rectangular Waveguide”.

1. A hollow rectangular waveguide cannot propagate TEM waves because:

a) Of the existence of only one conductor

b) Of the losses caused

c) It is dependent on the type of the material used

d) None of the mentioned

2. For any mode of propagation in a rectangular waveguide, propagation occurs:

a) Above the cut off frequency

b) Below the cut off frequency

c) Only at the cut-off frequency

d) Depends on the dimension of the waveguide

3. The modes of propagation supported by a rectangular wave guide is:

a) TM, TEM, TE modes

b) TM, TE

c) TM, TEM

d) TE, TEM

4. In TE mode of wave propagation in a rectangular waveguide, what is the equation that has to be satisfied?

a) (∂^{2}/ ∂x^{2} + ∂^{2}/ ∂y^{2}+ kC^{2}).HZ(x, y) =0

b) (∂^{2}/ ∂x^{2} + ∂^{2}/ ∂y^{2}– kC^{2}).HZ(x, y) =0

c) (∂^{2}/ ∂x^{2} – ∂^{2}/ ∂y^{2}+ kC^{2}).HZ(x, y) =0

d) None of the mentioned

5. For TE1ₒ mode, if the waveguide is filled with air and the broader dimension of the waveguide is 2 cm, then the cutoff frequency is:

a) 5 MHz

b) 7.5 MHz

c) 7.5 GHz

d) 5 GHz

6. For dominant mode propagation in TE mode, if the rectangular waveguide has a broader dimension of 31.14 mm , then the cutoff wave number:

a) 100

b) 500

c) 50

d) 1000

7. Dominant mode is defined as:

a) Mode with the lowest cut off frequency

b) Mode with the highest cut off frequency

c) Any TEM mode is called a dominant mode

d) None of the mentioned

8. TEₒₒ mode for a rectangular waveguide:

a) Exists

b) Exists but defined only under special cases

c) Does not exist

d) Cannot be determined

9. The lowest mode of TM wave propagation is:

a) TM10 mode

b) TM01 mode

c) TM11 mode

d) TM12 mode

10. In TE10 mode of wave propagation in a rectangular waveguide, if the broader dimension of the waveguide is 40 cm, then the cutoff wavelength for that mode is:

a) 8 cm

b) 6 cm

c) 4 cm

d) 2 cm

11. The cutoff frequency for the dominant mode in TM mode propagation for a rectangular waveguide of dimension of 30mm*40mm is:

a) 2 GHz

b) 1 GHz

c) 2 MHz

d) 4 MHz

12. In TE01 mode of wave propagation in a rectangular waveguide, if the smaller dimension of the waveguide is 2 cm, then the cutoff wavelength for that mode is:

a) 4 cm

b) 8 cm

c) 1 cm

d) 2 cm