# Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

 Show: Unseen questions Weak questions Review questions Learned questions Incorrect answer choices

2016-E7A: Digital circuits: digital circuit principles and logic circuits: classes of logic elements; positive and negative logic; frequency dividers; truth tables

2016-E7A01: Which is a bi-stable circuit?

A flip-flop

An "AND" gate

An "OR" gate

A clock

2016-E7A02: What is the function of a decade counter digital IC?

It produces one output pulse for every ten input pulses

It decodes a decimal number for display on a seven segment LED display

It produces ten output pulses for every input pulse

It adds two decimal numbers together

2016-E7A03: Which of the following can divide the frequency of a pulse train by 2?

A flip-flop

An XOR gate

An OR gate

A multiplexer

2016-E7A04: How many flip-flops are required to divide a signal frequency by 4?

2

1

4

8

2016-E7A05: Which of the following is a circuit that continuously alternates between two states without an external clock?

Astable multivibrator

Monostable multivibrator

J-K flip-flop

T flip-flop

2016-E7A06: What is a characteristic of a monostable multivibrator?

It switches momentarily to the opposite binary state and then returns to its original state after a set time

It produces a continuous square wave oscillating between 1 and 0

It stores one bit of data in either a 0 or 1 state

It maintains a constant output voltage, regardless of variations in the input voltage

2016-E7A07: What logical operation does a NAND gate perform?

It produces logic "0" at its output only when all inputs are logic "1"

It produces logic "0" at its output only when all inputs are logic "0"

It produces logic "1" at its output only when all inputs are logic "1"

It produces logic "0" at its output if some but not all inputs are logic "1"

2016-E7A08: What logical operation does an OR gate perform?

It produces logic "1" at its output if any or all inputs are logic "1"

It produces logic "0" at its output if all inputs are logic "1"

It only produces logic "0" at its output when all inputs are logic "1"

It produces logic "1" at its output if all inputs are logic "0"

2016-E7A09: What logical operation is performed by an exclusive NOR gate?

It produces logic "0" at its output if any single input is logic "1"

It produces logic "0" at its output only if all inputs are logic "0"

It produces logic "1" at its output only if all inputs are logic "1"

It produces logic "1" at its output if any single input is logic "1"

2016-E7A10: What is a truth table?

A list of inputs and corresponding outputs for a digital device

A table of logic symbols that indicate the high logic states of an op-amp

A diagram showing logic states when the digital device output is true

A table of logic symbols that indicate the logic states of an op-amp

2016-E7A11: What type of logic defines "1" as a high voltage?

Positive Logic

Reverse Logic

Assertive Logic

Negative logic

2016-E7A12: What type of logic defines "0" as a high voltage?

Negative logic

Reverse Logic

Assertive Logic

Positive Logic

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