Computer Organization Questions and Answers – Bus Arbitration

This set of Computer Organization and Architecture Multiple Choice Questions & Answers (MCQs) focuses on “Bus Arbitration”.

1. To resolve the clash over the access of the system BUS we use ______
a) Multiple BUS
b) BUS arbitrator
c) Priority access
d) None of the mentioned
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2. The device which is allowed to initiate data transfers on the BUS at any time is called _____
a) BUS master
b) Processor
c) BUS arbitrator
d) Controller
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3. ______ BUS arbitration approach uses the involvement of the processor.
a) Centralised arbitration
b) Distributed arbitration
c) Random arbitration
d) All of the mentioned
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4. The circuit used for the request line is a _________
a) Open-collector
b) EX-OR circuit
c) Open-drain
d) Nand circuit
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5. The Centralised BUS arbitration is similar to ______ interrupt circuit.
a) Priority
b) Parallel
c) Single
d) Daisy chain
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6. When the processor receives the request from a device, it responds by sending _____
a) Acknowledge signal
b) BUS grant signal
c) Response signal
d) None of the mentioned
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7. In Centralised Arbitration ______ is/are is the BUS master.
a) Processor
b) DMA controller
c) Device
d) Both Processor and DMA controller
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8. Once the BUS is granted to a device ___________
a) It activates the BUS busy line
b) Performs the required operation
c) Raises an interrupt
d) All of the mentioned
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9. The BUS busy line is made of ________
a) Open-drain circuit
b) Open-collector circuit
c) EX-Or circuit
d) Nor circuit
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10. After the device completes its operation _____ assumes the control of the BUS.
a) Another device
b) Processor
c) Controller
d) None of the mentioned
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11. The BUS busy line is used __________
a) To indicate the processor is busy
b) To indicate that the BUS master is busy
c) To indicate the BUS is already allocated
d) None of the mentioned
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12. Distributed arbitration makes use of ______
a) BUS master
b) Processor
c) Arbitrator
d) 4-bit ID
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13. In Distributed arbitration, the device requesting the BUS ______
a) Asserts the Start arbitration signal
b) Sends an interrupt signal
c) Sends an acknowledge signal
d) None of the mentioned
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14. How is a device selected in Distributed arbitration?
a) By NANDing the signals passed on all the 4 lines
b) By ANDing the signals passed on all the 4 lines
c) By ORing the signals passed on all the 4 lines
d) None of the mentioned
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15. If two devices A and B contesting for the BUS have ID’s 5 and 6 respectively, which device gets the BUS based on the Distributed arbitration.
a) Device A
b) Device B
c) Insufficient information
d) None of the mentioned
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Sanfoundry Global Education & Learning Series – Computer Organization and Architecture.

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