E7A: Digital circuits: digital circuit principles and logic circuits: classes of logic elements; positive and negative logic; frequency dividers; truth tables
E7A01:
What is a bistable circuit?
A flip-flop
An "AND" gate
An "OR" gate
A clock
E7A02:
How many output level changes are obtained for every two trigger pulses applied to the input of a "T" flip-flop circuit?
Two
None
One
Four
E7A03:
Which of the following can divide the frequency of pulse train by 2?
A flip-flop
An XOR gate
An OR gate
A multiplexer
E7A04:
How many flip-flops are required to divide a signal frequency by 4?
2
1
4
8
E7A05:
Which of the following is a circuit that continuously alternates between two unstable states without an external clock?
Astable Multivibrator
Monostable multivibrator
J-K Flip-Flop
T Flip-Flop
E7A06:
What is a characteristic of a monostable multivibrator?
It switches momentarily to the opposite binary state and then returns, after a set time, to its original state
It is a clock that 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
E7A07:
What logical operation does an AND gate perform?
It produces a logic "1" at its output only if all inputs are logic "1"
It produces a logic "0" at its output only if all inputs are logic "1"
It produces a logic "1" at its output if only one input is a logic "1"
It produces a logic "1" at its output if all inputs are logic "0"
E7A08:
What logical operation does a NAND gate perform?
It produces a logic "0" at its output only when all inputs are logic "1"
It produces a logic "0" at its output only when all inputs are logic "0"
It produces a logic "1" at its output only when all inputs are logic "1"
It produces a logic "0" at its output if some but not all of its inputs are logic "1"
E7A09:
What logical operation does an OR gate perform?
It produces a logic "1" at its output if any or all inputs are logic "1"
It produces a logic "0" at its output if all inputs are logic "1"
It only produces a logic "0" at its output when all inputs are logic "1"
It produces a logic "1" at its output if all inputs are logic "0"
E7A10:
What logical operation does a NOR gate perform?
It produces a logic "0" at its output if any or all inputs are logic "1"
It produces a logic "0" at its output only if all inputs are logic "0"
It produces a logic "1" at its output only if all inputs are logic "1"
It produces a logic "1" at its output only when none of its inputs are logic "0"
E7A11:
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's output is true
A table of logic symbols that indicates the low logic states of an op-amp
E7A12:
What is the name for logic which represents a logic "1" as a high voltage?
Positive Logic
Reverse Logic
Assertive Logic
Negative logic
E7A13:
What is the name for logic which represents a logic "0" as a high voltage?
Negative logic
Reverse Logic
Assertive Logic
Positive Logic
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