Computer Organization Interview Questions and Answers for freshers on “USB-2”.
1. The first field of any packet is _____
a) PID
b) ADDR
c) ENDP
d) CRC16
Answer: a
Clarification: The PID is the field that is used to identify the device (the device id).
2. The 4 bit PID’s are transmitted twice.
a) True
b) False
Answer: a
Clarification: The fields are transmitted twice, once with the true values and the second time with the complemented values.
3. The last field in the packet is ______
a) PID
b) ADDR
c) ENDP
d) CRC
Answer: d
Clarification: The last 5 bits of the packet is used for error checking, that is cyclic redundancy check.
4. The CRC bits are computed based on the values of the _____
a) PID
b) ADDR
c) ENDP
d) Both ADDR and ENDP
Answer: d
Clarification: The CRC bits are calculated based on the values of the address and endp.
5. The data packets can contain data upto ______
a) 512 bytes
b) 256 bytes
c) 1024 bytes
d) 2 KB
Answer: c
Clarification: None.
6. The most important objective of the USB is to provide ______
a) Isochronous transmission
b) Plug and play
c) Easy device connection
d) All of the mentioned
Answer: d
Clarification: The above are all the common features of the USB.
7. The transmission over the USB is divided into ____
a) Frames
b) Pages
c) Packets
d) Tokens
Answer: a
Clarification: To support the isochronous mode of operation the usb transmission is divided into frames.
8. The _____ signal is used to indicate the beginning of a new frame.
a) Start
b) SOF
c) BEG
d) None of the mentioned
Answer: b
Clarification: The SOF(State Of Frame) is used to indicate the beginning of a new frame.
9. The SOF is transmitted every ______
a) 1s
b) 5s
c) 1ms
d) 1Us
Answer: c
Clarification: None.
10. The power specification of usb is _____
a) 5v
b) 10v
c) 24v
d) 10v
Answer: a