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