Elenco Deluxe Digital / Analog Trainer with Tools Kit Version - Manual (Page 51)

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QUIZ - DIGITAL SECTION
INSTRUCTIONS: Complete the following examination, check your answers carefully.
1. The logic switches consist of . . .
r A. two NAND gates and an SPST switch.
r B. three OR gates.
r C. two NAND gates and a DPDT switch.
r D. one OR gate.
2. When the logic switch is thrown . . .
r A. the contacts do not bounce.
r B. a single transition is produced at the NAND gate output.
r C. a multiple transition is produced at the NAND gate output.
r D. none of the above.
3. If the X output is high, opening and closing the ground at X switch will . . .
r A. cause the X output to go low.
r B. cause the X output to go high.
r C. cause the X output to go from high to low.
r D. none of the above.
4. The logic indicator LED lights up when . . .
r A. input voltage is 2V.
r B. input voltage is greater than 2.8.
r C. the IC output is high.
r D. all of the above.
5. The logic switches use . . .
r A. single pole single throw switches.
r B. double pole double throw switches wires as single pole double throw switches.
r C. two pole 5 position rotary switches.
r D. 4 pole 3 position rotary switches.
6. The 100k
W
resistor on the logic indicator input . . .
r A. divides the input voltage in half.
r B. bias the input to +5V.
r C. bias the input to GND.
r D. turn on the LED.
7. When the logic switch is in the X position . . .
r A. X is high, X is low.
r B. X is high, X is high.
r C. X is low, X is high.
r D. X is low, X is low.
8. When the data switch is up and connected to the logic indicator . . .
r A. the switch output is greater than 2.8V.
r B. the switch output is GND.
r C. the LED will be out.
r D. none of the above.
9. The +5VDC power for the digital section comes from a . . .
r A. 7805 IC.
r B. 7905 IC.
r C. 5V battery.
r D. 7812 IC.
10. If pin 4 on U7B is high . . .
r A. pin 3 is low.
r B. pin 1 is low.
r C. pin 2 and 6 are high.
r D. pin 5 is high.
Ans wer s: 1. C ; 2 . B ; 3 . D ; 4 . B ; 5 . B ; 6 . C ; 7 . A ; 8 . A ; 9 . A ; 1 0. B