Computer Organization MCQ set number 00076

1. The first feild of any packet is _____
a) PID
b) ADDR
c) ENDP
d) CRC16

Answer

Answer: a [Reason:] 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

Answer: a [Reason:] 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

Answer: d [Reason:] 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

Answer: d [Reason:] 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

Answer: c [Reason:] 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

Answer: d [Reason:] 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

Answer: a [Reason:] To support the isochronous mode of operation the usb transmission is divided into frames.

8. The _____ signal is used to indiacate the beginning of a new frame.
a) Start
b) SOF
c) BEG
d) None of the mentioned

Answer

Answer: b [Reason:] The SOF(State Of Frame) is used to inidicate the beginning of a new frame.

9. The SOF is transmitted every ______
a) 1s
b) 5s
c) 1ms
d) 1Us

Answer

Answer: c [Reason:] None.

10. The power specification of usb is _____
a) 5v
b) 10v
c) 24v
d) 10v

Answer

Answer: a [Reason:] None.