Electronics and Communication Engineering - Electromagnetic Field Theory

46. 

The duration of sunspot cycle is

A. 1 year
B. 11 years
C. 55 years
D. 100 years

Answer: Option B

Explanation:

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47. 

Electromagnetic cavity resonators (energy storage devices) are used in

A. wave meters
B. bandpass filters
C. high frequency tubes
D. all of the above

Answer: Option D

Explanation:

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48. 

Waveguides are generally used above

A. 20 MHz
B. 100 MHz
C. 200 MHz
D. 1000 MHz

Answer: Option D

Explanation:

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49. 

Maximum power transfer will take place in a practical antenna if (XL = Load Reactance, XA Antenna Reactance)

A. XL = - XA
B. XL = XA
C. XL = XA
D. XL = XA2

Answer: Option A

Explanation:

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50. 

Which type of fading causes serious distortion of modulated signal?

A. Selective fading
B. Interference fading
C. Absorption fading
D. Polarization fading

Answer: Option A

Explanation:

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