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# Ece Viva Questions And Answers Pdf

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## 400 [SUBJECT WISE] ECE LAB VIVA Questions and Answers for Interview

A list of top frequently asked Digital Electronics Interview Questions and answers are given below. The difference between latches and Flip-flop is that the latches are level triggered and flip-flops are edge triggered.

In latches level triggered means that the output of the latches changes as we change the input and edge triggered means that control signal only changes its state when goes from low to high or high to low.

The system which has a base 2 is known as the binary system and it consists of only two digits 0 and 1. In this consist of three bits, we start writing the numbers from the rightmost bit power as 0 then the second bit as power 1 and the last as power 2.

So, we can represent a decimal number as. The complement of the sum of two numbers is equal to the product of the complement of two numbers. The basic gates that make up the digital system are called a logic gate. The circuit that can operate on many binary inputs to perform a particular logic function is called an electronic circuit. The advantages of these gates are that they can be used for any logic calculation.

K-Map is a pictorial representation of truth table in which the map is made up of cells, and each term in this represents the min term or max term of the function. By this method, we can directly minimize the Boolean function without following various steps. A minterm is called Product of sum because they are the logical AND of the set of variables and Maxterm are called sum of product because they are the logical OR of the set of variables. Pair : Two adjacent cell of karnaugh map is called as Pair.

It cancels one variable in a K-Map simplification. Quad : A Pair of Four adjacent pairs in a karnaugh map is called a quad. It cancels two variables in a K-Map simplification. Octet : A Pair of eight adjacent pair in a karnaugh map is called an octet. It cancels four variables in a K-map simplification. Fan-in- The Fan-in of the gate means that the number of inputs that are connected to the gate without the degradation of the voltage level of the system.

Fan-out- The Fan-out is the maximum number of same inputs of the same IC family that a gate can drive maintaining its output levels within the specified limits. Duality Theorem states that we can derive another Boolean expression with the existing Boolean expression by:.

Half-adder is the circuits that perform the addition of two bits. It has two inputs A and B and two outputs S sum and C carry. Full-adder is the circuits that perform the addition of three bits. It has three inputs A, B and a carry bit. Period time is the electrical energy used by the logic circuits.

It is expressed in milliwatts or nanowatts. The multiplexer is a digital switch which combines all the digital information from several sources and gives one output. The demultiplexer is a circuit that receives the input on a single line and transmits this onto 2n possible output line. A Demultiplexer of 2n outputs has n select lines, which are used to select which output line is to be sent to the input.

The demultiplexer is also called as Data Distributor. The minimum time that is required to maintain the constant voltage levels at the excitation inputs of the flip-flop device before the triggering edge of the clock pulse for the levels to be reliably clocked in the flip flop is called the Setup time.

It is denoted as tsetup. The minimum time at which the voltage level becomes constant after triggering the clock pulse in order to reliably clock into the flip flop is called the Hold time.

It is denoted by thold. D-latch is level sensitive whereas flip-flop is edge sensitive. Flip-flops are made up of latches. JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. All Interview. Latches are fast whereas flip-flop is slow. De Morgan's Theorem stated two theorems: 1. The complement of a product of two numbers is the sum of the complements of those numbers.

Digital systems are the system that processes a discrete or digital signal. Bits are the binary digits like 0 and 1. Digital Computer. There are four types of number system: Decimal Number System. Binary Number System. Octal Number System. Hexadecimal Number System. There are three basic logic gates- AND gate. OR gate. NOT gate. The applications of the octal number system are as follows: For the efficient use of microprocessors.

For the efficient use of digital circuits. It is used to enter binary data and display of information. The basic properties of Boolean algebra are: Commutative Property. Associative Property. Distributive Property.

The Product of sum POS form. The characteristics of digital ICs are - Propagation delay. Power Dissipation. Noise Margin. The limitations of Karnaugh Map are as follows: It is limited to six variable maps which means more than six variable involving expressions are not reduced. These are useful for only simplifying Boolean expression which is represented I standard form. The advantages of the K-Map method are as follows- It is an excellent method for simplifying expression up to four variables.

For the logical simplification, it gives us a visual method. It is more suitable for classroom teachings on logic simplification. The disadvantages of the K-Map method are as follows: It is not suitable when the number of variables exceeds more than four.

For Computer reduction, it is not suitable. We have to take while entering the numbers in the cell-like 0, 1 and don't care terms. Dot Sign and vice versa. Complimenting 0 and 1 in the expression by changing 0 to 1 and 1 to 0 respectively. Truth Table of Full-Adder 26 What is power dissipation? The applications of the multiplexer are as follows: It is used as a data selector from many inputs to get one output.

These are used in the data acquisition system. These are used in time multiplexing system. The applications of the demultiplexer are as follows: It is used in the data transmission system with error detection. It is used as a decoder for the conversion of binary to decimal. It is used as a serial to parallel converter. The differences between combinational and sequential circuits are as follows: S.

No Combinational Circuits Sequential Circuits 1. These are faster in speed. These are slower. These are easy to design. These are difficult to design. The clock input is not required. The clock input is required. In this, the memory units are not required. In this, the memory units are required to store the previous values of inputs. Example: Mux, Demux, encoder, decoder, adders, subtractors. Example: Shift registers, counters. The difference between Synchronous and Asynchronous Counters are as follows: S.

No Asynchronous Counters Synchronous Counters 1. These are low-speed Counters. These are high-speed Counters.

## Vlsi Lab Viva Questions And Answers For 7th Sem Ece

Electronics Engineering , like any other engineering job, has many technical questions. To shine better at electronics engineering interview, you need to have a strong grip over the technical questions. You need to keep yourself updated with e lectronics engineering interview questions to outperform other candidates. You do not want someone who has no knowledge about technical questions to outperform you in electronics engineering interview. It usually deals with low current voltage compared to Electrical Engineering specifically between v to 48v. Active components are those electrical components which require an external source for its full operation such as Diode, Transistor, Thyristor etc. Passive components are those components which do not need any external source for its function.

Ans: The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles. If the electronic device is plugged into a standard wall outlet, there will be a transformer inside which will convert the AC voltage you are supplying to the required DC voltage needed by the device. Examples: Computer, radio, T. V, etc Electric devices use line voltage vAC, vAC, etc Electric devices can also be designed to operate on DC sources, but will be at DC voltages above 48v. Examples: are incandescent lights, heaters, fridge, stove, etc

## ECE Viva questions and answers

What is Electronic? The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles. What is communication? Communication means transferring a signal from the transmitter which passes through a medium then the output is obtained at the receiver. Different types of communications?

### 400+ TOP ELECTRONICS and COMMUNICATION Engineering Questions & Answers PDF

Define Rectifier? Rectifier is a Electronic circuit which converts Alternating signal into pulcating D. Define Full wave Rectifier? This rectifier consists of center rapped transformer and two diodes.

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Electronics Engineering students need to face some Basic Electronics Questions whether they are preparing for an interview or viva voce. So, this article gives you few Basic Electronics Questions for Interview and other competetive exams. Generally, you need to refer a variety of books in order to cover the ocean of topics in Electronics. What is an ideal voltage source? Answer: A device with zero internal resistance.

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Comprehensive viva questions for ece with answers, online learning electronic devices MCQs, competency based interview questions for online electronics engineering degree programs. MCQ : A constant parameter which is always equal to the frequency at which operational amplifier's open loop gain is unity is called. MCQ : Amount by which an electrical signal is increased or amplified is called. MCQ : Protective device that burns open when current exceeds the rated limit is called. MCQ : Value of anode current below which a device switches from forward conduction region to the forward blocking region is called.

A list of top frequently asked Digital Electronics Interview Questions and answers are given below.