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42 questions
What two possible values can you achieve from Boolean constants and variables?
1 and 0
1 and 2
Only 1
What is a quantity that may, at different times, be equal to either 0 or 1?
Boolean Constants and Variables
Timing diagrams
Decimal numbering
What logic gate is this?
OR Gate
AND Gate
NOT Gate
What is the formula for a OR gate?
x=A+B
x=A.B
X=Ā
OR gate requires how many "1" inputs to output a "1"?
1
2
0
What does the "+" sign represent in the OR formula?
Addition
OR operation
Subtraction
What is this logic gate symbol?
OR Gate
AND Gate
NOT Gate
AND gate formula is?
x=A+B
x=A.B
x=Ā
AND Gate requires how many "1" inputs are required to get a "1" output?
0
1
2
What logic gate is this?
OR Gate
AND Gate
NOT Gate
What is the formula for a NOT Gate?
x=A+B
x=A.B
x=Ā
If an expression contains both AND and OR operations, which is performed first, unless there is parentheses in the expression?
AND
OR
Both operate
Whenever an inverter is present in a logic circuit diagram, its output expression is equal to the input expression with a bar over it.
True
False
Which Logic Gate is this?
NOR Gate
NAND Gate
XOR Gate
Which Logic gate is this?
NOR Gate
NAND Gate
XNOR Gate
Which logic gate is this?
NAND Gate
XOR Gate
XNOR Gate
Which gate produces a HIGH output whenever the two inputs are the same level?
XNOR Gate
XOR Gate
NAND Gate
What are considered the universal gates?
NOR and NAND Gates
XOR and XNOR Gates
NOT and OR Gates
What is a single ended device which has a gain of 1, mirroring the input at the output called?
Buffer
Inverter
Flip Flops
What is a single ended device that produces the state opposite to the input called?
Buffer
Inverting buffer
Op-Amp
How man gates can you fit on IC chip?
1
4
10
What is it called when an input reverses the outputs, then remains in an existing condition (stay limbo) producing an undesirable condition after ?
Invalid
No change
Reset
A bi-stable multivibratior circuit within the sequential digital logic family of devices able to store single bit of binary data is called?
Flip Flop
Binary store
Computer software
On a SR Flip-Flop, what would be the Q value be if S=1 and R=0? (IGNORE THE LINE ABOVE S AND R)
0
1
No change
What Flip-Flop diagram is this?
SR Flip-Flop
NOR Gate Flip-Flop
Clocked Flip-Flop
What will R equal if S=0, Q'=1 and Q=0?
0
1
Invalid
Why is it considered impossible to obtain a clean voltage transition from a switch?
Contact bounce
Intermittent action
Human error
What can be used to prevent switch bounce effecting the output?
NAND Latch
NOR Latch
Mechanical switch
What is A and B indictating
A= Positive Going Transition
B= Negative Going Transition
B= Positive Going Transition
A= Negative Going Transition
A=Clock Positive timer
B=Clock Negative timer
When a flip flop is designed to be clocked by a logic HIGH1 or Logic LOW 0 level, it is said to be?
Level Triggered
Edge Triggered
Clock Signals
What is used to overcome the disadvantage in a RS flip flop where while the HIGH clock signal is still present, if there is any changes to the S or R input, the Q output will change?
Edge triggered
Clock triggered
Positive going transition
The time interval immediately preceding the active transition of the CLK signal during which the control input must be maintained at the proper level is what?
Setup time
Hold time
Clock time
The time interval immediately following the active transition of the CKL signal during which the synchronous control input must be maintained at the proper level is called?
Setup time
Hold time
Clock time
On a JK Flip Flop, if both J and K are left high, what happens to the FF on each PGT?
Changes state
Invalid
No change
On a clocked D flip flop, Q will go to the same state as D when?
PGT occurs in the clock
Level triggering on Q and Q. occurs
Q output takes on value at its D input at different times
What type of flip flop is this?
Clocked D Flip Flop
D Latch Flip Flop
Clocked JK Flip Flop
What type of data transfer is going on here?
Parallel
Series
Combination of series and parallel
What must synchronous control inputs be used in conjunction with to trigger a flip flop circuit?
Clock signal
Set state
Reset state
What is a negative to asynchronous systems?
Difficult to design
More complex operation
Expensive to fabricate
How long does a propagation delay last?
100nsec
100msec
100psec
What type of flip flop is the BOTTOM diagram?
Register
Counter
MOD counter
Where is data stored in FF?
Register
Counters
Synchronization
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