# Digital electronics trb questions and answers pdf

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Published: 30.04.2021  Digital Electronics And Logic Design Mcqs With Answers Pdf Digital electronics mcq question with answer digital electronics mcq with detailed explanation for interview, entrance and competitive exams. Css mcq question with answer here you will find a list of common important questions on css cascading style sheets in mcq quiz style with answer for competitive exams and interviews. These frequently asked sample questions on css are given with correct choice of answer that you can check instantly. Eagle academy eda making sense of logic gates: the hidden world of digital electronics.

## Multiple Choice Questions and Answers on Digital Electronics

Decade counter counts 10 states from 0 to 9 i. B C D Save my name, email, and website in this browser for the next time I comment.

X Input. Y Input. F Output. The decimal equivalent of hex number 1A53 is. The number of control lines for an 8 to 1 Multiplexer is 3. The control signals are used to steer any one of the 8 inputs to the output. The number of flip-flops is required for Mod Counter is 4. For Mod-m Counter, we need N flip-flops where N is chosen to be the smallest number for which 2N is greater than or equal to m. In this case 24 greater than or equal to 1.

B Infrared rays. C Burst of microwaves. D Intense heat radiations. Thus the stored contents are erased. The output of a logic gate is 1 when all inputs are at logic 0. Data can be changed from special code to temporal code by using Shift Registers. A Register in which data gets shifted towards left or right when clock pulses are applied is known as a Shift Register. Speed of conversion is maximum because the comparisons of the input voltage are carried out simultaneously. The correction to be applied in decimal adder to the generated sum is When the four bit sum is more than 9 then the sum is invalid.

If a carry is generated when adding 6, add the carry to the next four bit group. B BCD. C Excess — 3. D Gray. The code where all successive numbers differ from their preceding number by single bit is Gray Code. It is an unweighted code. The most important characteristic of this code is that only a single bit change occurs when going from one code number to next.

ECL is the fastest logic family of all logic families. The digital logic family which has the lowest propagation delay time is ECL. Lowest propagation delay time is possible in ECL because the transistors are used in difference amplifier configuration, in which they are never driven into saturation and thereby the storage time is eliminated.

The device which changes from serial data to parallel data is demultiplexer. A demultiplexer takes in data from one line and directs it to any of its N outputs depending on the status of the select inputs.

Ans: B. A decoder coverts binary words into alphanumeric characters. This type uses an array of comparators connected in parallel and comparators compare the input voltage at a particular ratio of the reference voltage.

The maximum possible time required for change of state will be. A 15 ns. C 45 ns. The number of lines required for writing into memory are. Because 8-bit words required 8 bit data lines. This is done to. Add to each BCD for excess — 3. Open collector output.

CMOS circuits consume power. A Equal to TTL. B Less than TTL. C Twice of TTL. D Thrice of TTL. RAM is used by the user, number of times. Using complement method negative numbers can also be subtracted. We decide two voltages levels for positive digital logic. A C 14 bits. Thus 15 address bits are required, Only 16 bits can address it. B DRAM. C ROM. B addition by two. C multiplication by two. D subtraction by two. C high impedance. Equivalent in octal will be. The number of control lines for 32 25 and to select one input among them total 5 select lines are required.

A 2,2. B 2,3. C 3,3. B SRAM. Magnetic tape can only be accessed sequentially. Which of the following is a universal logic gate? NAND can generate any logic function. CMOS logic low level is 0 volts approx. A full adder circuit will add two bits and it will also accounts the carry input generated in the previous stage.

Thus three inputs and two outputs Sum and Carry are there. The pulse width of the strobe is 50ns. The frequency of the input signal which can be used for proper operation of the counter is approximately. C 2 MHz. D None. There are three product terms, so three AND gates of two inputs are required. As only two input OR gates are available, so two OR gates are required to get the logical sum of three product terms. C 8 bits. So whatever be the previous output, the next state will be 0. B CMOS.

C DTL. D RTL. Tags: Uncategorized. Related Posts. Harikesh Yadav. Leave a Reply Cancel reply Save my name, email, and website in this browser for the next time I comment. Leave this field empty. ## Digital Logic - Combinational Circuits

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Number of 1's in input may be more than one but the output will always be 1 in OR gate. So the answer is 'C'. This is the equation of OR gate.

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### Digital Electronics MCQ with Answers PDF - 1

By Practicing these interview questions, you can easily crack any Competitive Exams interview. Fully solved examples with detailed answer description. A full adder circuit will add two bits and it will also accounts the carry input generated in the previous stage.

Boolean Algebra can be used to Simplify any algebraic expressions Minimize the number of switches in a circuits Solve the mathematical problem Perform arithmetic calculation A. Simplify any algebraic expressions 2. An inverter gates can be developed using Two diodes A resistance and capacitance A transistor An inductance and capacitance C.

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