Mobile Communication Online Quiz: Multiple Choice Q&A

Mobile Communication Online Quiz. This section has 18 Multiple Choice Questions on the topic of Mobile Communication.

 

Mobile Communication Online Quiz

 

 

The power delay profile helps in determining ??

a. Excess delay
b. RMS delay spread
c. Excess delay spread
d. All of the above

 

Pure ALOHA is a ??

a. Random-access protocol
b. Scheduled access protocol
c. Hybrid access protocol
d. Demand access protocol

 

In Frequency-Selective Fading, the ??

a. Coherence Bandwidth of the channel is less than the bandwidth of transmitted channel
b. The coherence bandwidth of the channel is more than the bandwidth of transmitted channel
c. The coherence bandwidth of the channel is equal to the bandwidth of transmitted channel
d. None of the above

 

The increase in the number of users in PURE ALOHA causes ??

a. Increase in delay
b. Increase in probability of collision
c. Increase in spectrum
d. Both a and b
e. Both a and c

 

MC Quiz

 

The techniques used for small-scale multipath measurements are ??

1. Direct RF pulse system
2. Spread spectrum sliding correlator channel sounding
3. Frequency domain channel sounding

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

 

SDMA technique employs ??

a. Smart antenna technology
b. Use of spatial locations of mobile units within the cell
c. More battery consumption
d. Both a and b are correct
e. Both b and c are correct

 

Direct RF pulse system helps in calculating ??

a. Impulse response in frequency domain
b. Impulse response in phase domain
c. Power delay of the channel
d. All of the above

 

The advantage of using SDMA over other spread spectrum techniques is ??

a. Mobile station battery consumption is low
b. Reduced spectral efficiency
c. Increased spectral efficiency
d. Both a and b are correct
e. Both a and c are correct

 

Mobile Communication Online Quiz

 

The received signal from a multipath channel is expressed as ??

a. Convolution of transmitted signal and impulse response
b. Addition of transmitted signal and impulse response
c. Subtraction of transmitted signal and impulse response
d. All of the above
e. None of the above

 

The increased capacity of SDMA is due to ??

a. Focused signal transmitted into narrow transmission beams
b. Smart antennas pointing towards mobile stations
c. Use of different frequencies at same time slot
d. Both a and b are correct
e. Both a and c are correct

 

The impulse response of a multipath channel is determined by the fact that ??

a. Mobile radio channel may be modeled as linear filter
b. The impulse response is time-varying
c. Both a & b
d. None of the above

 

Coherence time is ??

a. Directly proportional to Doppler spread
b. Indirectly proportional to Doppler spread
c. Directly proportional to the square of Doppler spread
d. Directly proportional to twice of Doppler spread

 

Mobile Communication Online Quiz

 

The effects of small-scale multipath propagation are ??

1. Changes in signal strength
2. Random frequency modulation
3. Time dispersion

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

 

Types of small-scale fading, based on Doppler spread are ??

a. Fast fading
b. Frequency non-selective fading
c. Flat fading
d. Frequency selective fading

 

Small scale multipath propagation is caused due to waves with ??

1. Different propagation delays
2. Different amplitudes
3. Different phase

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

 

Mobile Communication Online Quiz

 

Flat fading or frequency nonselective fading is a type of ??

a. Multipath delay spread small scale fading
b. Doppler spread small scale fading
c. Both a & b
d. None of the above

 

Coherence bandwidth is ??

a. Channel that passes all spectral components with equal gain
b. The bandwidth of modulated signal
c. Channel that passes all spectral components with linear phase
d. Both a and c
e. Both a and b

 

If the coherence time of the channel is smaller than the symbol period of the transmitted signal, it is ??

a. Fast fading
b. Slow fading
c. Frequency selective fading
d. Frequency non-selective fading

 

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