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PLTW DIGITAL ELECTRONICS -
FINAL REVIEW SET
Which of the following equations is the un-simplified Sum-Of-Products
equation for the truth table shown below with F as the Output?
XYZF
0000
0011
0101
0110
1000
1010
1101
1 1 1 0 - CORRECT ANSWER >>F = X' Y' Z + X' Y Z' + X Y Z'
What is the letter symbol for current? - CORRECT ANSWER >>I
Which of the following is a correct DeMorgan's Identity?
1.. XY" = X'•Y' 2.
XY" = X'•Y
3. XY" = X' + Y'
4. XY = X + Y - CORRECT ANSWER>>XY" = X' + Y'
. Which of the following is the simplified equivalent for the Boolean
equation shown? F = Y' +XY'
1. F = X ''Y''
2. F = X
3. F = X Y'
4. F = Y' - CORRECT ANSWER>>F = Y'
Which Boolean equation is in Product-Of-Sums form?
1. F = X Y Z + X Y + X Y Z
2. F = X Y Z + Z (X + Y)
3. F = (X + Y)(X+ Z)(Y + Z)
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4. F = X Z(Y + Z)(Y + Z) - CORRECT ANSWER>>F = (X + Y)(X+ Z)(Y
+ Z)
Which of the following Boolean equation is in Sum-Of-Products form?
1. F = A B' C + A B C + A
2. F = (A')(B')(BC)(ABC)
3. F = (10010)11101001)
4. F = A' (B + C) A (B' + C) - CORRECT ANSWER>>F = A B' C + A B
C+A
What is the minimum number of flip-flops needed to build a Mod-10
Asynchronous counter?
1. 32
2. 64
3. 4
4. 10 - CORRECT ANSWER>>4
Which of the following statements applies to asynchronous counters?
1. Asynchronous counters are faster than synchronous counters.
2. Asynchronous counters require more power than synchronous
counters.
3. All the flip-flops in an Asynchronous counter are clocked at the same
time by a
common external clock.
4. Asynchronous counters are also called ripple counters. - CORRECT
ANSWER>>Asynchronous counters are also called ripple counters.
Propagation delay is _________________________.
1. A measure of the ability of a logic gate to drive further logic gates.
2. The difference in chip temperature from when the power is off to
when the power is on.
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3. The difference between what a logic gate outputs as a valid
logic voltage and what the input of the next gates expects to see as
a valid logic voltage.
4. The time required for a signal to travel from the input of a
logic gate to the output. - CORRECT ANSWER>>The
time required for a signal to travel from
the input of a logic gate to the output.
Name the type of gate that is off when it is switched to the on position
1. And
2. Nand
3. Or
4. Inverter - CORRECT ANSWER>>Inverter
Name three processes for simplifying circuits
1.Boolean Algebra, Boolean Equations, Karnaugh maps
2.Boolean Geometry, Demorgans Theroem, Break the bar change the
sign
3.Karnaugh Mapping, Demorgans Theorem, Boolean algebra
4.Simplify terms, karnaugh mapping, looping like terms - CORRECT
ANSWER>>Karnaugh Mapping, Demorgans Theorem, Boolean
algebra
What type of gates can be used to replace an AOI circuit to make it
smaller?
1. Exclusive OR/NOR
2. OR/AND
3. Inverter/NAND
4. NAND/NOR - CORRECT ANSWER>>NAND/NOR
How many flip-flops are required to implement a divide-by-4 circuit?
1. 4
2. 3
3. 2
4. 1 - CORRECT ANSWER>>2
PLTW DIGITAL ELECTRONICS -
FINAL REVIEW SET
Which of the following equations is the un-simplified Sum-Of-Products
equation for the truth table shown below with F as the Output?
XYZF
0000
0011
0101
0110
1000
1010
1101
1 1 1 0 - CORRECT ANSWER >>F = X' Y' Z + X' Y Z' + X Y Z'
What is the letter symbol for current? - CORRECT ANSWER >>I
Which of the following is a correct DeMorgan's Identity?
1.. XY" = X'•Y' 2.
XY" = X'•Y
3. XY" = X' + Y'
4. XY = X + Y - CORRECT ANSWER>>XY" = X' + Y'
. Which of the following is the simplified equivalent for the Boolean
equation shown? F = Y' +XY'
1. F = X ''Y''
2. F = X
3. F = X Y'
4. F = Y' - CORRECT ANSWER>>F = Y'
Which Boolean equation is in Product-Of-Sums form?
1. F = X Y Z + X Y + X Y Z
2. F = X Y Z + Z (X + Y)
3. F = (X + Y)(X+ Z)(Y + Z)
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4. F = X Z(Y + Z)(Y + Z) - CORRECT ANSWER>>F = (X + Y)(X+ Z)(Y
+ Z)
Which of the following Boolean equation is in Sum-Of-Products form?
1. F = A B' C + A B C + A
2. F = (A')(B')(BC)(ABC)
3. F = (10010)11101001)
4. F = A' (B + C) A (B' + C) - CORRECT ANSWER>>F = A B' C + A B
C+A
What is the minimum number of flip-flops needed to build a Mod-10
Asynchronous counter?
1. 32
2. 64
3. 4
4. 10 - CORRECT ANSWER>>4
Which of the following statements applies to asynchronous counters?
1. Asynchronous counters are faster than synchronous counters.
2. Asynchronous counters require more power than synchronous
counters.
3. All the flip-flops in an Asynchronous counter are clocked at the same
time by a
common external clock.
4. Asynchronous counters are also called ripple counters. - CORRECT
ANSWER>>Asynchronous counters are also called ripple counters.
Propagation delay is _________________________.
1. A measure of the ability of a logic gate to drive further logic gates.
2. The difference in chip temperature from when the power is off to
when the power is on.
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3. The difference between what a logic gate outputs as a valid
logic voltage and what the input of the next gates expects to see as
a valid logic voltage.
4. The time required for a signal to travel from the input of a
logic gate to the output. - CORRECT ANSWER>>The
time required for a signal to travel from
the input of a logic gate to the output.
Name the type of gate that is off when it is switched to the on position
1. And
2. Nand
3. Or
4. Inverter - CORRECT ANSWER>>Inverter
Name three processes for simplifying circuits
1.Boolean Algebra, Boolean Equations, Karnaugh maps
2.Boolean Geometry, Demorgans Theroem, Break the bar change the
sign
3.Karnaugh Mapping, Demorgans Theorem, Boolean algebra
4.Simplify terms, karnaugh mapping, looping like terms - CORRECT
ANSWER>>Karnaugh Mapping, Demorgans Theorem, Boolean
algebra
What type of gates can be used to replace an AOI circuit to make it
smaller?
1. Exclusive OR/NOR
2. OR/AND
3. Inverter/NAND
4. NAND/NOR - CORRECT ANSWER>>NAND/NOR
How many flip-flops are required to implement a divide-by-4 circuit?
1. 4
2. 3
3. 2
4. 1 - CORRECT ANSWER>>2
