Mobile Comunication CA 1

 

Part A ( one marks )

1. Large-scale path loss in mobile communication mainly depends on: 

 a) Frequency b) Distance c) Environment d) All of these 

2. Which mechanism causes bending of radio waves around obstacles? 

 a) Reflection b) Diffraction c) Scattering d) Polarization 

3. Small-scale fading occurs due to: 

a) Long-term variation in signal strength b) Multipath propagation c) 

Absorption loss d) Interference only 

4. The free-space propagation model assumes: 

a) No reflection and diffraction b) Multiple reflections c) Obstacles 

present d) Attenuation zero 

5. The two-ray ground reflection model is used to study: 

a) Signal path loss over short distances b) Long-distance propagation 

c) Only direct waves d) Only reflected waves 

6. Frequency reuse in cellular systems helps in: 

a) Increasing capacity b) Reducing coverage c) Improving bandwidth 

d) Decreasing number of cells 

7. Channel assignment strategy is used for: 

a) Allocating frequencies b) Signal amplification c) Multiplexing 

d) Modulation

8. Handoff occurs when: 

a) A mobile moves out of coverage b) A call is dropped c) Signal strength 

increases d) Frequency is reused

9. Handoff prioritization ensures: 

a) Continuous call b) Reduced capacity c) More interference d) Better 

modulation 

10. Practical handoff consideration involves: 

 a) Threshold margin b) Antenna height c) Bandwidth d) Duplexing

Part B 2 Marks

1.Define large-scale path loss. 

2. Write short notes on propagation mechanisms in mobile 

radio. 

3.List any two advantages of frequency reuse.

 4.Mention any two factors affecting handoff. 

Part C ( 3 Marks )

1.What are two-ray propagation models?

2.Write the effect of small scale fading. 

3.List the handoff strategies used in mobile networks. 

4.What are channel assignment strategies?