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This mock test of Sequential Circuits (Advance Level)- 1 for Computer Science Engineering (CSE) helps you for every Computer Science Engineering (CSE) entrance exam.
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QUESTION: 1

If the initial state Q_{A} Q_{B} Q_{C} = 110, after how many clocks it get back same value

Solution:

QUESTION: 2

What will be the current state after two clock pulses further from the number of pulses obtained from the above question?

Solution:

QUESTION: 3

The divide by N counter as shown in figure. If initially Q_{0} = 0, Q_{1} = 1, Q_{2} = 0. What is the value of N?

Solution:

So 5-mod counter.

QUESTION: 4

Consider the circuit given below with initial state Q_{0} = 1; Q_{1} = Q_{2} = 0. The state of the circuit is given by the value 4Q_{2} + 4Q_{1} + Q_{0 }

Which one of the following is the. correct state sequence of the circuit?

Solution:

Therefore, the correct state sequence of the circuit is 1, 2, 5, 3, 7, 6, 4.

QUESTION: 5

The following diagram represents a finite state machine which takes as input a binary number from the least significant bit

Which one of the following is TRUE?

Solution:

Here, for state Q_{0}

When input is 0 output is 0 and it remains in state Q_{0}.

When input is 1 output is 1 and goes to state Q_{1}.

For state Q_{1}.

When input is 0 output is 1, when input is 1 output is 0.

Here state changes from Q_{0} to Q_{1} when there is a 1 as input, in state Q_{1} every input is complemented.

Hence, the given circuit computes 2’s complement of the input number.

Hence (b) is correct answer.

QUESTION: 6

Consider the following circuit

The flip-flops are positive edge triggered DFFs. Each state is designated as a two bit string Q_{0}Q_{1} Let the initial state be 00. The state transition sequence is:

Solution:

The state transitions sequence is

QUESTION: 7

The functional difference between SR flip-flop and JK flip-flop is that JK flip-flop

Solution:

S-R flip flop gives invalid output when both inputs are 1 while JK flip-flop toggle the previous output when both inputs are 1. Hence it accepts both inputs 1.

QUESTION: 8

The number of flip-flops required in a modulo N counter is

Solution:

The number of flip-flops required for modulo N counter is [ log_{2}(N)].

QUESTION: 9

Consider the figure given below:

Initially all flip-flops are cleared. How many dock pulse have to be applied to the system before the output from FF3 becomes a HIGH level?

Solution:

So 4 clock pulses are needed.

QUESTION: 10

The logic circuit shown below is a 3-bit

Solution:

If input initially are Q_{A}Q_{B}Q_{C} = 000

So after 1st clock pulse Q_{A}Q_{B}Q_{C} = 100

Since, values is incremented so a binary up counter, synchronous since clock provided to all at same time.

QUESTION: 11

The inputs of the J-K flip-flop, shown below are:

PRESET = CLEAR = 1; J = K = 0

If a single clock pulse is applied the device will

Solution:

To make flip-flop working both preset = apart = 1 Since J = K = 0, so it does not change its state i.e. remains in same state.

QUESTION: 12

Consider the following control circuit which contains a 3-bit register and a black box with some combinational logic

The initial state of the circuit is Q_{1} Q_{2} Q_{3} = 000.

The circuit generates the control sequence.

(010) → ( 110) → ( 001) →(001) → . . . → ( 001)

On successive clock cycles. Which of the following sets of equations are implemented by the combinational logic in the black box?

Solution:

QUESTION: 13

‘n’ flip-flop will divide the clock frequency by a factor of

Solution:

n-fiip-flop divide the clock frequency by a factor of 2^{n}.

QUESTION: 14

Let a_{n} a_{n-1} ... a_{1} a_{0} be the binary representation of an integer b. The integer b is divisible by 3 if

Solution:

Binary representation of 12 is 110 D

So, (q_{0} + q_{2})-{q_{1} + q_{3})

= (0 + 1)- ( 0 + 1)

= 1 - 1

= 0

0 is divisible by 3 so, true.

QUESTION: 15

If a clock with time period 'T' is used with n stage shift register, the output of final stage will be delayed by

Solution:

N stage shift register will take (n - 1) x clock time to show the output of final stage.

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