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. In order to get the parameters 7,N,2, what HD-6402 UART control input values are needed?

a) CRL=1, CLS2=0, CLS1=0, SBS=0, PI=1, EPE=X
b) CRL=1, CLS2=1, CLS1=1, SBS=0, PI=0, EPE=1
c) CRL=1, CLS2=1, CLS1=0, SBS=1, PI=1, EPE=X
d) None of the above

2. In order to get the parameters 5,N,1, what HD-6402 UART control input values are needed?

a) CRL=1, CLS2=0, CLS1=0, SBS=0, PI=1, EPE=X
b) CRL=1, CLS2=1, CLS1=1, SBS=0, PI=0, EPE=1
c) CRL=1, CLS2=1, CLS1=0, SBS=1, PI=1, EPE=X
d) None of the above

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. In order to check the HD-6402 status signals, what control input action must be performed by a computer system?

a) The MR pin must be pulsed high for at least 1 ms
b) The SFD signal must be pulled low
c) The CRL signal must be pulled high
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. 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

7. Which UART section converts parallel data to serial data?

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

8. 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

9. If the TBRE signal is a logic 0, what must a computer do before clocking parallel data into the UART transmitter?

a) The computer must wait until (DR == 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

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. 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

12. 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

13. 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

14. What device can be placed between two RS232 devices to produce a crossover connection while using a "straight" cable?

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

15. Which of these devices is usually implemented as a DTE under the RS232 standard?

a) Printer
b) Computer
c) Modem
d) None of the above

16. 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

17. 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

18. 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

19. 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

20. 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

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

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

22. 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

23. 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

24. What feature MUST be supported by any USB device that draws power from the bus?

a) Isochronous mode
b) Bulk mode
c) Sleep (power-down) mode
d) None of the above

25. What is the maximum data transfer rate for any single peripheral on a USB interface?

a) 1 Mb/s
b) 2 Mb/s
c) 12 Mb/s
d) None of the above


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