# MCQ on Interference in wireless communication

## MCQ on Interference in wireless communication

MCQ on Interference in wireless communication, Objective Questions on Interference, Interference MCQ, Multiple Choice Questions on Interference in mobile communication, Interference in wireless communication

### Objective Type Questions

1. In cellular system if cluster size N is greater than 7 it will result in
• Reduces the number of channels in a cell
• Increases number of channels in a cell
• Reduces the number of channels but it reduces spectrum efficiency
• Increase in spectrum efficiency.

Answer: Reduces the number of channels but it reduces spectrum efficiency

2. The goal of frequency reuse technique in a cell is

• To improve system gain
• To alter the co-channel interference factor
• To increase spectrum efficiency
• To provide synchronization.

Answer: To increase spectrum efficiency

3. In a cellular system if 7 cell reuse pattern is applied the co-channel interference reduction factor q will be

• 5.67
• 5.78
• 4.9
• 4.6

4. The value of co-channel interference ratio q is 5.2 for N = 9 and if N = 12, it will be

• 8
• 16
• 6
• 12

5. An antenna used in wireless transmission radiates in all directions and it is a

• Spot beam antenna
• Yagi-Uda antenna
• Omnidirectional antenna
• None of the above.

6. If cluster size N = 4 a better cell sectoring system will have

• 120°
• 90°
• 60°
• 30°

7. The …….. sectored cell needs more antennas to be mounted and frequent handoffs.

• 120°
• 60°
• 90°
• 360°

8. For narrow beam applications which cellular pattern given below is correct?

• N = 7 with 120° sectors
• N = 4 with 60° sectors
• N = 4 with 90° sectors
• N = 7 with 90° sectors

Answer: N = 4 with 60° sectors

9. In flat ground or in a valley interference can be effectively reduced by

• Lowering antenna height
• Reducing power level
• Increasing antenna height
• Lowering antenna separation

Answer: Lowering antenna height

10. If there is a notch available in antenna pattern it will have the following effect

• Will not alter interference
• Reduce interference
• Increase gain
• Increase power

11. The co-channel and long distance interference are reduced by

• Yagi-Uda antenna
• Umbrella pattern
• Omnidirectional antenna
• None of the above

12. Technique used for reducing interference is

• Cell splitting
• Handoff
• Diversity
• Sectoring

13. Speech quality can be measured by

• Subjective and objective last
• SNR
• C/I
• SNR and C/I

• Signal to noise and distortion ratio
• Signal to noise and deviation ratio
• Signal to noise ratio
• None of the above

Answer: Signal to noise and distortion ratio

15. The $\left [ \frac{Signal + Noise + distortion}{Noise + distortion } \right ]$ is

• SINAD reduction factor
• Co-channel interference reduction factor

16. Adjacent channel and Next channel interference are

• Different
• Same
• Related by amplitude
• Having more interference

17. If two service providers are available in one market it is known as

• Monopoly
• Duality
• Duopoly
• Duplex

18. Consider the following statements

1. Adjacent-channel interference occur in cell site.
2. Adjacent channel interference occur in mobile unit.
• 1 and 2 are correct
• 1 alone is correct
• 2 alone is correct
• Both are not correct

Answer: 1 and 2 are correct

19. In cellular system if cross talk occurs it will be as compared to telephone systems.

• less
• more
• doubled
• unpredictable

20. The antenna coverage can be controlled by

1. Multiple antennas
2. Using synthesis of power pattern
• 1 alone is correct
• 2 alone is correct
• 1 and 2 are correct.
• Both are not correct

Answer: 1 and 2 are correct.

21. Ring combiner can handle

• 16 channels
• 8 channels
• 32 channels
• 8 channels

22. SAT is

• Supervisory amplifier tuner
• Supervisory amplifier tone
• Supervisory audio tone
• Supervisory analog tone

Answer: Supervisory audio tone

23. The demultiplexer used at cell-site channel receiver

• Has no losses
• Has more gain
• Has split losses
• Has hysteresis losses

Answer: Has split losses

24. Consider following statements. Find which of them are true ?

• Tropospheric scattering over land path is persistent as that over water
• Tropospheric scattering over land path is not as persistent as that over water
• The tropospheric propagation is more pronounced during morning
• The tropospheric propagation is a long distance propagation and the distance is around 200 mi.
• 1, 2, and 4 are true
• 2 and 3 are true
• 1, 3, and 4 are true
• All are true

Answer: 1, 3, and 4 are true

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MCQ on Handoffs and dropped calls