Deck 7: Flip-Flops, Adders, and Subtractors

Question 1

Which of the following is the Universal Flip-flop?

A)s-r flip-flop
B)j-k flip-flop
C)master slave flip-flop
D)d flip-flop

Answer 1

j-k flip-flop

Question 2

How many types of triggering takes place in a flip flops?

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

Answer 2

3

Question 3

The term synchronous means _

A)the output changes state only when any of the input is triggered
B)the output changes state only when the clock input is triggered
C)the output changes state only when the input is reversed
D)the output changes state only when the input follows it

Answer 3

the output changes state only when the clock input is triggered

Question 4

The S-R, J-K and D inputs are called                          

A)asynchronous inputs
B)synchronous inputs
C)bidirectional inputs
D)unidirectional inputs

Question 5

The characteristic of J-K flip-flop is similar to                            

A)s-r flip-flop
B)d flip-flop
C)t flip-flop
D)gated t flip-flop

Question 6

A J-K flip-flop can be obtained from the clocked S-R flip-flop by augmenting

A)two and gates
B)two nand gates
C)two not gates
D)two or gates

Question 7

What is the significance of the J and K terminals on the J-K flip-flop?

A)there is no known significance in their designations
B)the j represents "jump," which is how the q output reacts whenever the clock goes high and the j input is also high
C)the letters were chosen in honour of jack kilby, the inventory of the integrated circuit
D)all of the other letters of the alphabet are already in use

Question 8

How many flip-flops are in the 7475 IC?

A)2
B)1
C)4
D)8

Question 9

In parts of the processor, adders are used to calculate                          

A)addresses
B)table indices
C)increment and decrement operators
D)all of the mentioned

Question 10

Total number of inputs in a half adder is                      

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

Question 11

In which operation carry is obtained?

A)subtraction
B)addition
C)multiplication
D)both addition and subtraction

Question 12

If A and B are the inputs of a half adder, the sum is given by                      

A)a and b
B)a or b
C)a xor b
D)a ex-nor b

Question 13

If A and B are the inputs of a half adder, the carry is given by                      

A)a and b
B)a or b
C)a xor b
D)a ex-nor b

Question 14

Half-adders have a major limitation in that they cannot                      

A)accept a carry bit from a present stage
B)accept a carry bit from a next stage
C)accept a carry bit from a previous stage
D)accept a carry bit from the following stages

Question 15

The difference between half adder and full adder is                      

A)half adder has two inputs while full adder has four inputs
B)half adder has one output while full adder has two outputs
C)half adder has two inputs while full adder has three inputs
D)all of the mentioned

Question 16

If A, B and C are the inputs of a full adder then the sum is given by                      

A)a and b and c
B)a or b and c
C)a xor b xor c
D)a or b or c

Question 17

If A, B and C are the inputs of a full adder then the carry is given by                      

A)a and b or (a or b) and c
B)a or b or (a and b) c
C)(a and b) or (a and b)c
D)a xor b xor (a xor b) and c

Question 18

Half subtractor is used to perform subtraction of                        

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

Question 19

For subtracting 1 from 0, we use to take a from neighbouring bits.

A)carry
B)borrow
C)input
D)output

Question 20

How many outputs are required for the implementation of a subtractor?

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

Question 21

Let the input of a subtractor is A and B then what the output will be if A = B?

A)0
B)1
C)a
D)b

Question 22

Let A and B is the input of a subtractor then the output will be                        

A)a xor b
B)a and b
C)a or b
D)a exnor b

Question 23

Let A and B is the input of a subtractor then the borrow will be                        

A)a and b'
B)a' and b
C)a or b
D)a and b

Question 24

What does minuend and subtrahend denotes in a subtractor?

A)their corresponding bits of input
B)its outputs
C)its inputs
D)borrow bits