Computer Organization and Architecture Multiple Choice Questions on “SCSI BUS-1”.
1. The key features of the SCSI BUS are _________
a) The cost effective connective media
b) The ability overlap data transfer requests
c) The highly efficient data transmission
d) None of the mentioned
Answer: b
Clarification: The SCSI BUS can overlap various data transfer requests by the devices.
2. In a data transfer operation involving SCSI BUS, the control is with ______
a) Initiator
b) Target
c) SCSI controller
d) Target Controller
Answer: d
Clarification: The initiator involves in the arbitration process and after winning the BUS it’ll hand over the control to the target controller.
3. In SCSI transfers the processor is not aware of the data being transferred.
a) True
b) False
Answer: a
Clarification: The processor or the controller is unaware of the data being transferred.
4. What is DB(P) line?
a) That the data line is carrying the device information
b) That the data line is carrying the parity information
c) That the data line is partly closed
d) That the data line is temporarily occupied
Answer: b
Clarification: None.
5. The BSY signal signifies _________
a) The BUs is busy
b) The controller is busy
c) The Initiator is busy
d) The Target is Busy
Answer: a
Clarification: This signal is generally initiated when the BUS is currently occupied in an operation.
6. The SEL signal signifies _________
a) The initiator is selected
b) The device for BUS control is selected
c) That the target is being selected
d) None of the mentioned
Answer: b
Clarification: This signal is usually asserted during the selection or reselection process.
7. ________ signal is asserted when the initiator wishes to send a message to the target.
a) MSG
b) APP
c) SMS
d) ATN
Answer: d
Clarification: The ATN signal is short for attention, which is used to intimate the target that the initiator sent a message to it.
8. The MSG signal is used _________
a) To send a message to the target
b) To receive a message from the mailbox
c) To tell that the information being sent is a message
d) None of the mentioned
Answer: c
Clarification: None.
9. _____ is used to reset all the device controls to their startup state.
a) SRT
b) RST
c) ATN
d) None of the mentioned
Answer: b
Clarification: None.
10. The SCSI BUS uses ______ arbitration.
a) Distributed
b) Centralised
c) Daisy chain
d) Hybrid
Answer: a
Clarification: The SCSI uses distributed arbitration to select the device to give the BUS control.