# Logic Gates and Networks – 2 MCQ’s

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Logic Gates and Networks – 2″.

1. How many truth table entries are necessary for a four-input circuit?
a) 4
b) 8
c) 12
d) 16

2. Which input values will cause an AND logic gate to produce a HIGH output?
a) At least one input is HIGH
b) At least one input is LOW
c) All inputs are HIGH
d) All inputs are LOW

3. A single transistor can be used to build which of the following digital logic gates?
a) AND gates
b) OR gates
c) NOT gates
d) NAND gates

4. Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?
a) OR gates only
b) AND gates and NOT gates
c) AND gates, OR gates, and NOT gates
d) OR gates and NOT gates

5. The AND function can be used to ___________ and the OR function can be used to _____________
a) Enable, disable
b) Disable, enable
c) Synchronize, energize
d) Detect, invert

6. If we use an AND gate to inhibit a signal from passing one of the inputs must be ___________
a) LOW
b) HIGH
c) Inverted
d) Floating

7. The basic logic gate whose output is the complement of the input is the ___________
a) OR gate
b) AND gate
c) INVERTER gate
d) XOR gate

8. The dependency notation “>=1” inside a block stands for which operation?
a) OR
b) XOR
c) AND
d) XNOR

9. Logic gate circuits contain predictable gate functions that open theirs ____________
a) Outputs
b) Inputs
c) Pre-state
d) Impedance state

10. How many NAND circuits are contained in a 7400 NAND IC?
a) 1
b) 2
c) 4
d) 8