Objective Questions On Data Transmission Medium Part-4

1. The electromagnetic waves having frequencies from 300GHz to 400GHz are known as .......
A) Medium Waves
B) Short Waves
C) Micro Waves
D) Infrared Waves

2. The electromagnetic waves having frequencies from 3GHz to 30MHz are known as .......
A) Medium Waves
B) Short Waves
C) Micro Waves
D) Infrared Waves

3. The wave length of the ................. ranges from 850nm and 900nm, where the receivers with good sensitivity are available.
A) visible light
B) infrared light
C) micro waves
D) radio waves

4. The .................... standard developed for an infrared data link(IRDA) provides the standards for the bidirectional communications used in cordless devices such as mice, keyboards, joysticks and handheld computers.
A) IRDA-A
B) IRDA-B
C) IRDA-C
D) IRDA-D

5. The .................... standard developed for an infrared data link (IRDA) provides the standards for the data rates from 115Kbps to 4Mbps with a distance upto 1 meter.
A) IRDA-A
B) IRDA-B
C) IRDA-C
D) IRDA-D

6. The ................... standard developed for an infrared data link provides the standards for the data rates of 75Kbits/sec and the distance range is upto 8 meter.
A) IRDA-A
B) IRDA-B
C) IRDA-C
D) IRDA-D

7. The disadvantage of .................. signals is that they cannot penetrate walls or other objects and they are diluted by strong light sources.
A) infrared
B) microwave
C) radio wave
D) long wave

8. For point to point communication in infrared system .............. depends on quality of emitted light, its purity, atmospheric conditions and signal obstructions.
A) Bandwidth capacity
B) Node capacity
C) Attenuation
D) EMI

9. For .................. communication in infrared system attenuation depends on quality of emitted light its purity and atmospheric conditions.
A) Point-to-point
B) Point-to-multipoint
C) Broadcast
D) Multi point-to-Multi point


10. State whether the following statements are correct for the applications of infrared.
i) very high data rates can be supported, due to very high bandwidth.
ii) for communication between keyboard, mouse PCs and printers
iii) For cellular communication
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii

11. Depending upon the type of application, which of the following is/are the categories of satellites.
i) Communication satellites  ii) Remote sensing satellites  iii) Weather satellites  iv) Astrological satellites
A) i, ii and iii only
B) ii, iii and iv only
C) i, iii and iv only
D) All i, ii, iii and iv

12. Which of the following is/are the typical band of signal frequencies used for the satellites communication.
i) C band   ii) Ku band  iii) Ka band
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii

13. Which of the following is/are the different types of beams used to cover a specific  area of earth.
i) Global beams   ii) Spot beams  iii) Point-to-Point Spot  iv) Use of dual polarization
A) i, ii and iii only
B) ii, iii and iv only
C) i, ii and iv only
D) All i, ii, iii and iv

14. State whether the following statements are True or False for the characteristics of satellite microwave systems.
i) It uses frequency range between 4 to 6 GHz
ii) It supports a bandwidth and data rate in the range of 1 to 10 Mbps.
iii) Attenuation depends on frequency, power, antenna size and atmospheric condition.
A) False, True, True
B) False, True, False
C) True, False, False
D) True, False, True

15. For ................... frequencies, the download frequency is 4GHz and up-link frequency is 6GHz.
A) C band
B) Ku band
C) Ka band
D) Ca band

16. The frequencies having down-link frequency 11GHz and up-link frequency 14GHz is known as .................. frequency.
A) C band
B) Ku band
C) Ka band
D) Ca band

17. For ................ frequencies, the download frequency is 30GHz and up-link frequency 30GHz.
A) C band
B) Ku band
C) Ka band
D) Ca band
 
18. The electromagnetic web having the wavelength from 1Km to 100M are known as .............
A) Long Waves
B) Medium Waves
C) Short Waves
D) Micro Waves

19. The electromagnetic wave having the wave length from 10Km to 1Km are known as ..........
A) Long Waves
B) Medium Waves
C) Short Waves
D) Micro Waves

20. In satellite communication, the bandwidth of each transponder is ............... and it can handle .............. at a time.
A) 24 MHz, 8 Channels
B) 32 MHz, 10 Channels
C) 36 MHz, 12 Channels
D) 38 MHz, 16 Channels


Answers

1. D) Infrared Waves
2. B) Short Waves
3. B) infrared light
4. C) IRDA-C
5. D) IRDA-D
6. C) IRDA-C
7. A) infrared
8. C) Attenuation
9. C) Broadcast
10. A) i and ii only
11. A) i, ii and iii only
12. D) All i, ii and iii
13. C) i, ii and iv only
14. A) False, True, True
15. A) C band
16. B) Ku band
17. C) Ka band
18. B) Medium Waves
19. A) Long Waves
20. C) 36 MHz, 12 Channels

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