Computer Networks

381. In channel, the information may not be

1. Reproduced
2. Reach the receiver at all
3. Both a & b
4. None of these

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382. In character code system, a 5-bit code is

1. 11
2. 101
3. 10
4. 10101

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383. In character synchronous system , ____________ are added

1. Special character
2. Start bit
3. Stop bit
4. None of these

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384. In data communication the signal has to travel through the transmission media that may be

1. Wired
2. Wireless
3. Both a & b
4. None of these

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385. In data communication using computers , ____________ signal are normally converted into PCM

1. Analog
2. Digital
3. Both a & b
4. None of these

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386. In digital signal the main source of noise is ____________ , which introduces as the finite number of quantization levels during the conversion to PCM code

1. Quantization noise
2. Equalization noise
3. Digital noise
4. None of these

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387. In DME, logical values are indicated by ____________ of transitions

1. Absence
2. Presence
3. Both a & b
4. None of these

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388. In dynamic range, the largest voltage amplitude is ____________ the smallest voltage amplitude

1. 32times
2. 64times
3. 125times
4. 256times

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389. In error control, this corruption could be in the form of ____________

1. Noise
2. Electromagnetic interference
3. Both a & b
4. None of these

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390. In Ethernet, Data is transferred between wiring closets using either a ____________

1. Heavy coaxial cable
2. Thick net
3. Fibre optic cable
4. All of these

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