Flip flop mcq

Click on View Questions Button to check Correct and incorrect answers. A JK flip-flop has its J input connected to logic level 1 and its input to the Q output. A clock pulse is fed to its clock input. The flip-flop will now. The output Q n of a J-K flip-flop is zero. It changes to 1 when a clock pulse is applied D. The inputs J n and K n are respectively. For which of the following flip flops, the output is clearly defined for all combinations of two inputs?

Save my name, email, and website in this browser for the next time I comment. Sign in. Log into your account. Password recovery. Forgot your password? Get help. Free Online Practice Test. Home Electronics Digital Design.

Electronics Digital Design Engineering. Time limit: 0. You have already completed the Test before. Hence you can not start it again. You must sign in or sign up to start the Test. You have to finish following quiz, to start this Test:. Answered Review. Question 1 of The main advantage of flip-flops over transistor circuit is. The flip-flop output are always.

Input clock of RS flip flop is given to. The only difference between a combinational circuit and a flip flop is that. D flip flop is a circuit having.

If a flip-flop is in the SET state, its Q output will be. Which of the following memory elements uses an RC circuit as its input?Save my name, email, and website in this browser for the next time I comment.

flip flop mcq

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More. Primary Menu Inst Tools. Search for: Search. Because of inverted outputs. Because of cross-coupled connection. Because of triggering functionality. The logic circuits whose outputs at any instant of time depends only on the present input but also on the past outputs are called. Sequential circuits. Combinational circuits. What is a trigger pulse?

A pulse that reverses the cycle of operation. A pulse that starts a cycle of operation. A pulse that prevents a cycle of operation. None of the Mentioned. Which of the following is correct for a gated D-type flip-flop?

The output complement follows the input when enabled. Only one of the inputs can be HIGH at a time. The output toggles if one of the inputs is held HIGH.

Synchronous operation. Cross coupling. Gate impedance. Low input voltages. One example of the use of an S-R flip-flop is as:. Transition pulse generator. Switch debouncer. Astable oscillator.

Digital Circuits - Conversion of Flip-Flops

Any pulse given to go into previous state.We can convert one flip-flop into the remaining three flip-flops by including some additional logic. So, there will be total of twelve flip-flop conversions. Fill the excitation values inputs of given flip-flop for each combination of present state and next state. The excitation table for all flip-flops is shown below. Get the simplified expressions for each excitation input.

If necessary, use Kmaps for simplifying. Draw the circuit diagram of desired flip-flop according to the simplified expressions using given flip-flop and necessary logic gates.

Now, let us convert few flip-flops into other. Follow the same process for remaining flipflop conversions. Here, the given flip-flop is SR flip-flop and the desired flip-flop is D flip-flop. Therefore, consider the following characteristic table of D flip-flop. So, write down the excitation values of SR flip-flop for each combination of present state and next state values. The following table shows the characteristic table of D flip-flop along with the excitation inputs of SR flip-flop.

We can use 2 variable K-Maps for getting simplified expressions for these inputs.

flip flop mcq

The circuit diagram of D flip-flop is shown in the following figure. This circuit consists of SR flip-flop and an inverter. This inverter produces an output, which is complement of input, D. Hence, it is a D flip-flop. Similarly, you can do other two conversions.

Here, the given flip-flop is D flip-flop and the desired flip-flop is T flip-flop. Therefore, consider the following characteristic table of T flip-flop. We know that D flip-flop has single input D. So, write down the excitation values of D flip-flop for each combination of present state and next state values. The following table shows the characteristic table of T flip-flop along with the excitation input of D flip-flop.

So, we require a two input Exclusive-OR gate along with D flip-flop. The circuit diagram of T flip-flop is shown in the following figure. This circuit consists of D flip-flop and an Exclusive-OR gate. Hence, it is a T flip-flop. Here, the given flip-flop is JK flip-flop and the desired flip-flop is T flip-flop. So, write down the excitation values of JK flip-flop for each combination of present state and next state values. The following table shows the characteristic table of T flip-flop along with the excitation inputs of JK flipflop.

We can use 2 variable K-Maps for getting simplified expressions for these two inputs. This circuit consists of JK flip-flop only. Here, the given flip-flop is T flip-flop and the desired flip-flop is D flip-flop.

Therefore, consider the characteristic table of D flip-flop and write down the excitation values of T flip-flop for each combination of present state and next state values.To suspend a simulation, you can use this system task command. Transition from x to 1. Transition from 0 to 1, x or z. Transition from z to 1, x. Transition from 1 to 0.

The wait statement is. In continuous assignment statement LHS can be. Scalar net. Vector net. Concatenation of both. To trigger an event, we can use the following operator. EXOR gate. In most synthesis tools, what will happen when a signal that is needed in a sensitivity list is not included?

A warning message will be generated and the code will be synthesized but the resulting netlist will not provide the desired results. The synthesis tool will ignore the sensitivity list since all objects that are read as part of a procedural assignment statement are considered to be sensitive.

There will be no effect on the design and pre-synthesis simulation will be consistent with post-synthesis simulation. None of these. The keyword deassign is a. In non-blocking assignment, the compiler.

Both of the above options are correct, depending on the specific case. None of the options are correct. Asynchronous circuit. Synchronous circuit.Click on View Questions Button to check Correct and incorrect answers. Explanation: Logic circuits for digital systems can be either combinational or sequential.

Flip flop can be activated with either a positive or negative edge trigger. T flip flop allows the same inputs. When an inverter is placed between both inputs of an SR flip-flop, then resulting flip-flop is. The functional difference between both inputs of an SR flip-flop is that JK flip-flop.

In JK flip flop same input, i. At the end of the clock pulse the value of output Q is uncertain. The situation is referred to as? A race around condition is a flaw in an electronic system or process whereby the output and result of the process is unexpectedly dependent on the sequence or timing of other events. Consider a RS flip-flops with both inputs set to 0. Save my name, email, and website in this browser for the next time I comment. Sign in. Log into your account.

Password recovery. Forgot your password? Get help. Free Online Practice Test. Home Electronics Digital Design. Electronics Digital Design Engineering. Time limit: 0. You have already completed the Test before. Hence you can not start it again. You must sign in or sign up to start the Test. You have to finish following quiz, to start this Test:.

flip flop mcq

Answered Review. Question 1 of Correct Explanation: Logic circuits for digital systems can be either combinational or sequential. Incorrect Explanation: Logic circuits for digital systems can be either combinational or sequential. Unattempted Explanation: Logic circuits for digital systems can be either combinational or sequential. The D flip flop is only activated by.

Correct Flip flop can be activated with either a positive or negative edge trigger.

Latches, Flip-Flops, and Timers MCQs

Incorrect Flip flop can be activated with either a positive or negative edge trigger.Instrumentation Tools assists you with a complete guide of objective questions which mainly targets the aspirants of Electrical, Electronics and Instrumentation engineering Streams to crack the competitive exams and to prepare for the top MNC companies written tests.

In case you have attended any competitive exams or interviews recently or have additional questions beyond what we covered, we encourage you to post them in our Instrumentation Forum to discuss about it further. This quiz section consists of total 10 questions.

flip flop mcq

Each question carries 1 point. No negative points for wrong answers. You can get the Quiz Answers after submitting all quiz questions. Save my name, email, and website in this browser for the next time I comment. This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More. Primary Menu Inst Tools. Search for: Search. Previous Article. Oscillators and Signal Generators Objective Questions.

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Verilog Quiz | MCQs | Interview Questions

Leave a Comment Cancel Reply Save my name, email, and website in this browser for the next time I comment. Instrumentation MCQ. Flip Flop Circuits Objective Questions.

WordPress Image Lightbox.In previous chapter, we discussed about Latches.

Flip Flops Objective Questions – Part 1

Those are the basic building blocks of flip-flops. We can implement flip-flops in two methods. In first method, cascade two latches in such a way that the first latch is enabled for every positive clock pulse and second latch is enabled for every negative clock pulse.

So that the combination of these two latches become a flip-flop. In second method, we can directly implement the flip-flop, which is edge sensitive. In this chapter, let us discuss the following flip-flops using second method. SR flip-flop operates with only positive clock transitions or negative clock transitions. Whereas, SR latch operates with enable signal.

ELECTRONICS BJT FET FLIP FLOP BASED MOST IMPORTANT QUESTIONS USEFUL FOR TATA STEEL,SAIL OTHER EXAMS✅

The circuit diagram of SR flip-flop is shown in the following figure. But, this flip-flop affects the outputs only when positive transition of the clock signal is applied instead of active enable. The following table shows the characteristic table of SR flip-flop. The maximum possible groupings of adjacent ones are already shown in the figure.

D flip-flop operates with only positive clock transitions or negative clock transitions. Whereas, D latch operates with enable signal. That means, the output of D flip-flop is insensitive to the changes in the input, D except for active transition of the clock signal.

The circuit diagram of D flip-flop is shown in the following figure. The operation of D flip-flop is similar to D Latch. Therefore, D flip-flop always Hold the information, which is available on data input, D of earlier positive transition of clock signal. From the above state table, we can directly write the next state equation as. Next state of D flip-flop is always equal to data input, D for every positive transition of the clock signal.

Hence, D flip-flops can be used in registers, shift registers and some of the counters. JK flip-flop is the modified version of SR flip-flop. It operates with only positive clock transitions or negative clock transitions. The circuit diagram of JK flip-flop is shown in the following figure. The operation of JK flip-flop is similar to SR flip-flop. The following table shows the characteristic table of JK flip-flop.

T flip-flop is the simplified version of JK flip-flop. The circuit diagram of T flip-flop is shown in the following figure. The operation of T flip-flop is same as that of JK flip-flop. The following table shows the characteristic table of T flip-flop. The output of T flip-flop always toggles for every positive transition of the clock signal, when input T remains at logic High 1. Hence, T flip-flop can be used in counters.


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