Fading - Mobile Radio Propagation - MCQs with answers

Fading - Mobile Radio Propagation - MCQs with answers

Q1. Fading is caused due to

1. Multi path propagation
2. Obstacles
3. Frequency variations at the source
4. Variation in amplitude and phase at receiver

a. 1) and 2) are correct
b. 1), 2) and 4) are correct
c. 2) and 3) are correct
d. All are correct

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Q2. Coherence time refers to

a. Time required to attain a call with the busy base station
b. Time required for synchronization between the transmitter and the receiver
c. Minimum time for change in magnitude and phase of the channel
d. None of the above

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Q3. Fading due to shadowing is

a. Fading due to large obstructions
b. Large coherence time of the channel as compared to the delay constraints
c. Small coherence time of the channel as compared to the delay constraints
d. Both a) and b)
e. Both a) and c)

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Q4. Deep fade is

1.Strong destructive interference
2.Drop in signal to noise ratio
3.Temporary failure of message transfer

a. 1) and 2) are correct
b. 1) and 3) are correct
c. 2) and 3) are correct
d. All are correct

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Q5. Doppler spread refers to

a. Signal fading due to Doppler shift in the channel
b. Temporary failure of message transfer
c. Large coherence time of the channel as compared to the delay constraints
d. All of the above

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