Computer System Architecture

71. All the operations in a digital system are synchronized by a clock that is generated by:

1. Clock
2. Pulse
3. Pulse generator
4. Bus

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72. Asynchronous means:

1. Not in step with the elapse of address
2. Not in step with the elapse of control
3. Not in step with the elapse of data
4. Not in step with the elapse of time

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73. ____________ is a single control line that informs destination unit that a valid is available on the bus:

1. Strobe
2. Handshaking
3. Synchronous
4. Asynchronous

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74. What is disadvantage of strobe scheme:

1. No surety that destination received data before source removes it
2. Destination unit transfer without knowing whether source placed data on data bus
3. Can’t said
4. Both a & b

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75. In ____________ technique has 1 or more control signal for acknowledgement that is used for intimation:

1. Handshaking
2. Strobe
3. Both a & b
4. None of these

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76. The keyboard has a ____________ asynchronous transfer mode:

1. Parallel
2. Serial
3. Optimum
4. None

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77. In ____________ transfer each bit is sent one after the another in a sequence of event and requires just one line:

1. Serial
2. Parallel
3. Both a & b
4. None of these

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78. Modes of transfer b/w computer and I/O device are:

1. Programmed I/O
2. Interrupt-initiated I/O
3. DMA
4. Dedicated processor such as IOP and DCP
5. All of these

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79. ____________ operations are the results of I/O operations that are written in the computer program:

1. Programmed I/O
2. DMA
3. Handshaking
4. Strobe

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80. ____________ is a dedicated processor that combines interface unit and DMA as one unit:

1. Input-Output Processor
2. Only input processor
3. Only output processor
4. None of these

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