Deck 4: TTL Circuits, Karnaugh Maps, and Flip-Flops

Question 1

Standard TTL circuits operate with a volt power supply.

A)2
B)4
C)5
D)3

Answer 1

5

Question 2

A TTL gate may operate inadvertently as an                          

A)digital amplifier
B)analog amplifier
C)inverter
D)regulator

Answer 2

analog amplifier

Question 3

Which statement below best describes a Karnaugh map?

A)it is simply a rearranged truth table
B)the karnaugh map eliminates the need for using nand and nor gates
C)variable complements can be eliminated by using karnaugh maps
D)a karnaugh map can be used to replace boolean rules

Answer 3

it is simply a rearranged truth table

Question 4

Which of the examples below expresses the commutative law of multiplication?

A)a + b = b + a
B)a • b = b + a
C)a • (b • c) = (a • b) • c
D)a • b = b • a

Question 5

The Boolean expression Y = (AB)' is logically equivalent to what single gate?

A)nand
B)nor
C)and
D)or

Question 6

The systematic reduction of logic circuits is accomplished by:

A)symbolic reduction
B)ttl logic
C)using boolean algebra
D)using a truth table

Question 7

Each "1" entry in a K-map square represents:

A)a high for each input truth table condition that produces a high output
B)a high output on the truth table for all low input combinations
C)a low output for all possible high input conditions
D)a don't care condition for all possible input truth table combinations

Question 8

Each "0" entry in a K-map square represents:

A)a high for each input truth table condition that produces a high output
B)a high output on the truth table for all low input combinations
C)a low output for all possible high input conditions
D)a don't care condition for all possible input truth table combinations

Question 9

Looping on a K-map always results in the elimination of                      

A)variables within the loop that appear only in their complemented form
B)variables that remain unchanged within the loop
C)variables within the loop that appear in both complemented and uncomplemented form
D)variables within the loop that appear only in their uncomplemented form

Question 10

Which of the following expressions is in the sum-of-products form?

A)(a + b)(c + d)
B)(a * b)(c * d)
C)a* b *(cd)
D)a * b + c * d

Question 11

What is an ambiguous condition in a NAND based S'-R' latch?

A)s'=0, r'=1
B)s'=1, r'=0
C)s'=1, r'=1
D)s'=0, r'=0

Question 12

In a NAND based S'-R' latch, if S'=1 & R'=1 then the state of the latch is

A)no change
B)set
C)reset
D)forbidden

Question 13

A NAND based S'-R' latch can be converted into S-R latch by placing                          

A)a d latch at each of its input
B)an inverter at each of its input
C)it can never be converted
D)both a d latch and an inverter at its input

Question 14

The difference between a flip-flop & latch is                          

A)both are same
B)flip-flop consist of an extra output
C)latches has one input but flip-flop has two
D)latch has two inputs but flip-flop has one

Question 15

How many types of flip-flops are?

A)2
B)3
C)4
D)5

Question 16

The S-R flip flop consist of                          

A)4 and gates
B)two additional and gates
C)an additional clock input
D)3 and gates

Question 17

What is one disadvantage of an S-R flip-flop?

A)it has no enable input
B)it has a race condition
C)it has no clock input
D)invalid state

Question 18

One example of the use of an S-R flip-flop is as                          

A)racer
B)stable oscillator
C)binary storage register
D)transition pulse generator

Question 19

When is a flip-flop said to be transparent?

A)when the q output is opposite the input
B)when the q output follows the input
C)when you can see through the ic packaging
D)when the q output is complementary of the input

Question 20

On a positive edge-triggered S-R flip-flop, the outputs reflect the input condition when

A)the clock pulse is low
B)the clock pulse is high
C)the clock pulse transitions from low to high
D)the clock pulse transitions from high to low

Question 21

What is the hold condition of a flip-flop?

A)both s and r inputs activated
B)no active s or r input
C)only s is active
D)only r is active

Question 22

One example of the use of an S-R flip-flop is as                        

A)transition pulse generator
B)racer
C)switch debouncer
D)astable oscillator

Question 23

The truth table for an S-R flip-flop has how many VALID entries?

A)1
B)2
C)3
D)4

Question 24

When both inputs of a J-K flip-flop cycle, the output will                        

A)be invalid
B)change
C)not change
D)toggle

Question 25

Which of the following is correct for a gated D-type flip-flop?

A)the q output is either set or reset as soon as the d input goes high or low
B)the output complement follows the input when enabled
C)only one of the inputs can be high at a time
D)the output toggles if one of the inputs is held high