# Cut-off wavelength λC for TE20 mode for a standard rectangular waveguide

1.  2/a

2.  2a

3.  a

4.  2a2

4

a

Explanation :
No Explanation available for this question

# If narrow dimension of a standard rectangular waveguide carrying the dominant mode is reduced, then

1.  wave impedance will increase

2.  ttenuation increase

3.  guide wavelength will decrease

4.  power handling capability will decrease

4

wave impedance will increase

Explanation :
No Explanation available for this question

# If in an air line, adjacent maxima are found at 12.5 cm and 37.5 cm, then operating frequency is

1.  1.5GHz

2.  600 MHz

3.  300MHz

4.  1.2 GHz

4

600 MHz

Explanation :
No Explanation available for this question

# For the dominant mode, in a rectangular waveguide with breadth 10 cm, the guide wavelength for a signal of 2-5 GHz will be

1.  12 cm

2.  16 cm

3.  18 cm

4.  20 cm

4

16 cm

Explanation :
No Explanation available for this question

# The degenerate mod. in a waveguide are characterised by

1.  same cut off frequencies but different field distributions

2.  same cut-off frequencies and same field distributions

3.  different cut-off frequencies but same field distributions

4.  different cut-off frequencies and different field distributions

4

same cut off frequencies but different field distributions

Explanation :
No Explanation available for this question

# Guide wavelength (λg),cut-off wavelength (λ0) and free-space wavelength (λ0) of a waveguide are related as ,

1.  1/ λg2=1/ λ02-1/ λc2

2.  1/ λ02=1/ λg2-1/ λc2

3.  1/ λc2=1/ λ02-1/ λg2

4.  1/ λg2=1/ λ02-1/ λc2

4

1/ λc2=1/ λ02-1/ λg2

Explanation :
No Explanation available for this question

# For rectangular waveguide (ax b, a>b) to support only the TE10 mode at wave length λ winch one of the following pairs of inequalities is to be satisfied

1.  b

2.  b

3.  a

4.  a

4

a<λ<2b;λ<2a

Explanation :
No Explanation available for this question

# In a hollow rectangular waveguide, the phase velocity

1.  increases with increasing frequency

2.  decreases with increasing frequency

3.  is independent of frequency

4.  will vary with frequency depending upon the frequency rang

4

decreases with increasing frequency

Explanation :
No Explanation available for this question

# A dominant mode waveguide, not terminated in its characteristic impedance, is excited with a 10 GHz signal. If ‘d’ is the distance between two successive minima of the standing wave in the guide, then

1.  d=1.5cm

2.  d is less than 1.5 cm

3.  d is greater than 1.5 cm

4.  d = 3 cm

4

d is less than 1.5 cm

Explanation :
No Explanation available for this question

1.  1.06GHz

2.  2-44GHz

3.  3-66GHz

4.  4.00GHz

4