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Digital Electronics
Sequential Circuits
Flip Flops

Questions mapped to Flip Flops under Sequential Circuits.

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Q#1 Sequential Circuits GATE EE 2024 (Set 1) MCQ +1 mark -0.33 marks

In the circuit, the present value of  is 1. Neglecting the delay in the combinatorial circuit, the values of  and , respectively, after the application of the clock will be

S=0, Z=0

S=0, Z=1

S=1, Z=0

S=1, Z=1

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Q#2 Sequential Circuits GATE EE 2023 (Set 1) NAT +2 marks -0 marks

Neglecting the delays due to the logic gates in the circuit shown in figure, the decimal equivalent of the binary sequence  of initial logic states, which will not change with clock, is

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Q#3 Sequential Circuits GATE EE 2018 (Set 1) MCQ +2 marks -0.66 marks

Which one of the following statements is true about the digital circuit shown in the figure?

 

It can be used for dividing the input frequency by 3.

It can be used for dividing the input frequency by 5.

It can be used for dividing the input frequency by 7

It cannot be reliably used as a frequency divider due to disjoint internal cycles.

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Q#4 Sequential Circuits GATE EE 2016 (Set 1) MCQ +2 marks -0.66 marks

The current state  of a two JK flip-flop system is 00. Assume that the clock rise-time is much smaller than the delay of the JK flip-flop. The next state of the system is

00

01

11

10

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Q#5 Sequential Circuits GATE EE 2014 (Set 2) MCQ +2 marks -0.66 marks

A JK flip flop can be implemented by T flip-flops. Identify the correct implementation.

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Q#6 Sequential Circuits GATE EE 2014 (Set 3) MCQ +2 marks -0.66 marks

Two monoshot multivibrators, one positive edge triggered  and another negative edge triggered  are connected as shown in figure

The monoshots  and  when triggered produce pulse of width  and  respectively. Where . The steady state output voltage  of the circuit is

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Q#7 Sequential Circuits GATE EE 2012 (Set 1) MCQ +1 mark -0.33 marks

Consider the given circuit,

In this circuit, the race around

Does not occur

Occurs when CLK = 0

Occurs when CLK = 1 and A = B = 1

Occurs when CLK = 1 and A = B = 0

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Q#8 Sequential Circuits GATE EE 2008 (Set 1) MCQ +2 marks -0.66 marks

The truth table of a monoshot shown in the figure is given in the table below:

Two monoshots, one positive edge triggered and other negative edge triggered, are connected as shown in the figure. The pulse widths of the two monoshot outputs, , and , are and , respectively.

The frequency and the duty cycle of the signal at Q1 will respectively be

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Q#9 Sequential Circuits GATE EE 2005 (Set 1) MCQ +2 marks -0.66 marks

Select the circuit, which will produce the given output Q for the input signals X1 and X2 given in Figure.

 

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Q#10 Sequential Circuits GATE EE 2005 (Set 1) MCQ +2 marks -0.66 marks

In figure, as long as  and , the output Q remains

 

At 1

At 0

At its initial value

Unstable

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Q#11 Sequential Circuits GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

The digital circuit shown in figure generates a modified clock pulse at the output. Choose the correct output waveform form the options given below.

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Q#12 Sequential Circuits GATE EE 2003 (Set 1) MCQ +2 marks -0.66 marks

An X-Y flip flop, whose Characteristic Table is given below is to be implemented using a J-K flip flop

This can be done by making

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Q#13 Sequential Circuits GATE EE 2002 (Set 1) MCQ +1 mark -0.33 marks

The frequency of the clock signal applied to the rising edge triggered D flip-flop shown in figure is 10 kHz. The frequency of the signal available at Q is

 

10 kHz

2.5 kHz

20 kHz

5 kHz

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Q#14 Sequential Circuits GATE EE 1999 (Set 1) MCQ +2 marks -0.66 marks

For a flip-flop formed from two NAND gates as shown, the unusable state corresponds to

D:\1Mayu\Gate-9\JPG\JPG\1999\1999\Q2_2.5.jpg

X=0, Y=0

X=0, Y=1

X=1, Y=0

X=1, Y=1

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Q#15 Sequential Circuits GATE EE 1995 (Set 1) NAT +1 mark -0 marks

For a J-K flip-flop its J input is tied to its own  output and its K input is connected to its own Q output. If the flip-flop is fed with a clock of frequency 1MHz, its Q output frequency will be _________________

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