Direct Memory Access Questions

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1.

The DMA differs from the interrupt mode by __________

A

The involvement of the processor for the operation

B

The method of accessing the I/O devices

C

The amount of data transfer possible

D

None of the mentioned

Correct Answer: D

DMA is an approach of performing data transfers in bulk between memory and the external device without the intervention of the processor.

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2.

The DMA transfers are performed by a control circuit called as __________

A

Device interface

B

DMA controller

C

Data controller

D

Overlooker

Correct Answer: B

The Controller performs the functions that would normally be carried out by the processor.

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3.

In DMA transfers, the required signals and addresses are given by the __________

A

Processor

B

Device drivers

C

DMA controllers

D

The program itself

Correct Answer: C

The DMA controller acts as a processor for DMA transfers and overlooks the entire process.

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4.

After the completion of the DMA transfer, the processor is notified by __________

A

Acknowledge signal

B

Interrupt signal

C

WMFC signal

D

None of the mentioned

Correct Answer: B

The controller raises an interrupt signal to notify the processor that the transfer was complete.

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5.

The DMA controller has _______ registers.

A

4

B

2

C

3

D

1

Correct Answer: C

The Controller uses the registers to store the starting address, word count and the status of the operation.

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6.

When the R/W bit of the status register of the DMA controller is set to 1.

A

Read operation is performed

B

Write operation is performed

C

Read & Write operation is performed

D

None of the mentioned

Correct Answer: A

None.

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7.

The controller is connected to the ____

A

Processor BUS

B

System BUS

C

External BUS

D

None of the mentioned

Correct Answer: B

The controller is directly connected to the system BUS to provide faster transfer of data

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8.

Can a single DMA controller perform operations on two different disks simultaneously?

A

True

B

False

C

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Explanation : The DMA controller can perform operations on two different disks if the appropriate details are known.

D

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Explanation : The DMA controller can perform operations on two different disks if the appropriate details are known.

Correct Answer: A

The DMA controller can perform operations on two different disks if the appropriate details are known.