Direct Memory Access MCQ’s

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This set of Computer Architecture Multiple Choice Questions & Answers (MCQs) focuses on “Direct Memory Access”.

1. The DMA transfers are performed by a control circuit called as __________
a) Device interface
b) DMA controller
c) Data controller
d) Overlooker

2. In DMA transfers, the required signals and addresses are given by the __________
a) Processor
b) Device drivers
c) DMA controllers
d) The program itself

3. 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

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

5. 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

6. Can a single DMA controller perform operations on two different disks simultaneously?
a) True
b) False

7. The DMA controller has _______ registers.
a) 4
b) 2
c) 3
d) 1

8. The controller is connected to the ____
a) Processor BUS
b) System BUS
c) External BUS
d) None of the mentioned

9. The technique whereby the DMA controller steals the access cycles of the processor to operate is called __________
a) Fast conning
b) Memory Con
c) Cycle stealing
d) Memory stealing

10. The controller uses _____ to help with the transfers when handling network interfaces.
a) Input Buffer storage
b) Signal enhancers
c) Bridge circuits
d) All of the mentioned

11. The registers of the controller are ______
a) 64 bits
b) 24 bits
c) 32 bits
d) 16 bits

12. The technique where the controller is given complete access to main memory is __________
a) Cycle stealing
b) Memory stealing
c) Memory Con
d) Burst mode

13. To overcome the conflict over the possession of the BUS we use ______
a) Optimizers
b) BUS arbitrators
c) Multiple BUS structure
d) None of the mentioned

14. When the process requests for a DMA transfer?
a) Then the process is temporarily suspended
b) The process continues execution
c) Another process gets executed
d) process is temporarily suspended & Another process gets executed

15. The DMA transfer is initiated by _____
a) Processor
b) The process being executed
c) I/O devices
d) OS

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