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 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

2. 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

3. 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

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

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

5. In order to get the parameters 8,E,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

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

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

7. What architectural feature of the HD-6402 UART helps to prevent gaps between transmitted characters?

a) Double-buffering
b) Tri-state outputs
c) Internal control logic
d) None of the above

8. 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

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 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

11. 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

12. In a half-duplex connection, which local RS232 signal, if turned "on," will cause the remote RS232 "RLSD" signal to turn on?

a) DTE Ready
b) DCE Ready
c) RTS
d) CTS
e) None of the above

13. 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

14. 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

15. The connector on a cable meant to connect to an RS232 DTE is what type?

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

16. 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

17. 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

18. 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

19. 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

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. 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 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

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 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

25. What USB communications mode would be used for devices that send very little data at unpredictable intervals?

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


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