Electronics and Communication Engineering - Electromagnetic Field Theory

41. 

In case of static electric field Maxwell's divergence equation states that:

A. ∇ . = 1/r
B. ∇ . = r0
C. ∇ . = εr
D. ∇ . = r

Answer: Option B

Explanation:

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42. 

For a reflection co-efficient of 0.5, the value of SWR is

A. -1
B. 1
C. 2
D. 3

Answer: Option D

Explanation:

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43. 

A rectangular waveguide having TE10 mode as dominant mode is having a cut off frequency of 18 GHz for the TE30 mode. The inner broad wall dimension of the rectangular waveguide is

A. 5/3 cm
B. 5 cm
C. 5/2 cm
D. 10 cm

Answer: Option C

Explanation:


44. 

A 50 p characteristic impedance line is connected to a load which shows a reflection coefficients of 0.268. If Vin = 15 volt, then the net power delivered to the load will be

A. 0.139 W
B. 1.39 W
C. 0.278 W
D. 2.78 W

Answer: Option B

Explanation:

r , P = v2/ZL.


45. 

1 dB is equal to __________ nepier

A. 8.6
B. 6.8
C. 8
D. 0

Answer: Option A

Explanation:

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