Secondary Memory,Input Output interfce(DMA,Interrupts) Questions

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1.

The main reason for the discontinuation of semi conductor based storage devices for providing large storage space is _________

A

Lack of sufficient resources

B

High cost per bit value

C

Lack of speed of operation

D

None of the mentioned

Correct Answer: B

In the case of semi conductor based memory technology, we get speed but the increase in the integration of various devices the cost is high.

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2.

The digital information is stored on the hard disk by ____________

A

Applying a suitable electric pulse

B

Applying a suitable magnetic field

C

Applying a suitable nuclear field

D

By using optic waves

Correct Answer: A

The digital data is sorted on the magnetized discs by magnetizing the areas.

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3.

For the synchronization of the read head, we make use of a _______

A

Framing bit

B

Synchronization bit

C

Clock

D

Dirty bit

Correct Answer: C

The clock makes it easy to distinguish between different values red by a head.

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4.

One of the most widely used schemes of encoding used is _________

A

NRZ-polar

B

RZ-polar

C

Manchester

D

Block encoding

Correct Answer: C

The Manchester encoding used is also called as phase encoding and it is used to encode both clock and data.

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5.

The drawback of Manchester encoding is _________

A

The cost of the encoding scheme

B

The speed of encoding the data

C

The Latency offered

D

The low bit storage density provided

Correct Answer: D

The space required to represent each bit must be large enough to accommodate two changes in magnetization.

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6.

The read/write heads must be near to disk surfaces for better storage.

A

True

B

False

C

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Explanation : By maintaining the heads near to the surface greater bit densities can be achieved

D

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Explanation : By maintaining the heads near to the surface greater bit densities can be achieved

Correct Answer: A

By maintaining the heads near to the surface greater bit densities can be achieved