ECT215 Practice Test II

Instructions: There are 25 questions on this test. It is written in a style very similar to the REAL exam #2. Choose the best answer from among those given. Click the GRADE button on the bottom of the form when you want the exam graded.

Note: You can practice this test as many times as you desire; the system will cook you up a fresh batch of questions each time you access this page.

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1. What data rate will result on the HD-6402 UART if the clock frequency is 16 kHz?

a) 1000 bps
b) 1200 bps
c) 2400 bps
d) 8000 bps
e) None of the above

2. If the TRE signal of the HD-6402 UART goes high and stays high for a long time (for example, several character periods), then what could be concluded about the general state of the device?

a) Data is about to be emitted at the TRO pin
b) Data is waiting at the receiver parallel output pins
c) Both the transmit holding register and transmit shift register are empty, and no data is being transmitted
d) None of these conclusions can be reached

3. What two HD-6402 signals give the status of the internal transmit buffer and shift registers?

a) DR and OE
b) TBRE and TRE
c) TBRL and DRR
d) None of the above

4. If the TBRE signal is a logic 1, what must a computer do before clocking parallel data into the UART transmitter?

a) The computer must wait until (TBRE == 0)
b) The computer must pulse SFD high for at least 1 ms
c) Nothing, the UART is ready for data
d) None of the above

5. Which UART section controls the transmit and receive parameters?

a) Transmitter
b) Receiver
c) Control
d) Status
e) None of the above

6. What are the two signals used for handshaking on the HD-6402 receiver?

a) SBS and CRL
b) TBRE and /TBRL
c) DR and /DRR
d) None of the above

7. What are the two signals used for handshaking on the HD-6402 transmitter?

a) SBS and CRL
b) TBRE and /TBRL
c) DR and /DRR
d) None of the above

8. If the DR signal of the HD-6402 UART is high and new serial data arrives, what condition will result, and how the will the UART respond?

a) The receiver will be "overrun," and the OE signal will go high
b) The transmitter will run out of data, and the PE signal will go high
c) A parity error will be detected, and the TBRE signal will go low
d) None of the above

9. If the HD-6402 UART is programmed with SBS=1, what can be possibly concluded?

a) The device receiving the data at the other end of the wire need a parity bit.
b) The receiving device is slow and needs extra space between characters
c) The EBCDIC character 8-bit character set is in use.
d) None of the above

10. What clock frequency is needed on the TRC pin to get a data rate of 1200 bps on the HD-6402 UART?

a) 2400 Hz
b) 4800 Hz
c) 19.2 kHz
d) None of the above

11. An RS232 control pin measures -2.05 V. What is its state?

a) Logic 1, "off"
b) Logic 0, "on"
c) Logic 1, "on"
d) Illegal state
e) None of the above

12. The PESA RM3500 video switcher is configured as a DCE and has a DB25F RS232 connector. A personal computer is a DTE and has a DB25M connector. Therefore, the two devices are compatible according to the RS232 standard and communication between them is guaranteed.

a) True
b) False

13. Which of these devices is usually implemented as a DCE under the RS232 standard?

a) Printer
b) Computer
c) Smart Terminal
d) None of the above

14. What type of connector is found on an RS232 DTE?

a) DB25M
b) DB9M
c) DB25F
d) None of the above

15. What pin number must always be connected on an RS232 interface?

a) 1
b) 2
c) 3
d) 4
e) 5
f) None of the above

16. What is the correct range of voltages for a logic "0" on an RS232 interface?

a) -3 to -15 V
b) 3 to 15 V
c) 3 to 25 V
d) -3 to -25 V
e) None of the above

17. What device will allow you to connect a DB25M cable connector into a DB25M socket?

a) Gender Mender
b) Null Modem
c) Interface Dongle
d) None of the above

18. A DTE receives data on RS232 pin ____ , and a DCE receives data on pin _____. Pick the response that correctly fills both blanks.

a) 2,4
b) 3,2
c) 5,6
d) None of the above

19. Which of the pins below are usually swapped in an RS232 crossover cable?

a) 2 and 3
b) 4 and 8
c) 3 and 4
d) 6 and 7
e) None of the above

20. An RS232 control pin measures -3.7 V. What is its state?

a) Logic 1, "off"
b) Logic 0, "on"
c) Logic 1, "on"
d) Illegal state
e) None of the above

21. What end of the USB interface has an "A" connector?

a) The controller (CPU) end
b) The peripheral device end
c) Either end
d) None of the above

22. How many physical devices are allowed on the universal serial bus?

a) 31
b) 63
c) 127
d) None of the above

23. What USB communications mode would be used for devices that send large amounts of data (usually in blocks) and require error detection and correction?

a) Interrupt mode
b) Bulk mode
c) Isochronous mode
d) None of the above

24. Devices can be powered from the USB port. What is the maximum current that can be drawn from a computer's USB port?

a) 100 mA
b) 500 mA
c) 1000 mA
d) None of the above

25. What USB communications mode would be used for devices that send lots of data, but need no error correction?

a) Interrupt mode
b) Bulk mode
c) Isochronous mode
d) None of the above


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