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Test: Digital Electronics - 1 - Electrical Engineering (EE) MCQ


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25 Questions MCQ Test Digital Electronics - Test: Digital Electronics - 1

Test: Digital Electronics - 1 for Electrical Engineering (EE) 2025 is part of Digital Electronics preparation. The Test: Digital Electronics - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Digital Electronics - 1 MCQs are made for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Digital Electronics - 1 below.
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Test: Digital Electronics - 1 - Question 1

What is the direction of control bus?

Test: Digital Electronics - 1 - Question 2

In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________.

Test: Digital Electronics - 1 - Question 3

For the circuit shown below, Q = 0 initially. What shall be the subsequent states of Q when clock pulses are given?

Test: Digital Electronics - 1 - Question 4

Which of the following operation are performed on linear queues?

  1. Testing a linear queue for underflow
  2. Enqueue operation
  3. Dequeue operation
  4. Testing a linear queue for overflow.
Select the correct answer using the codes given below the lists
Test: Digital Electronics - 1 - Question 5

If Vin is 0.99 V, what is the digital output of the ADC0801 after INTER goes low?

Detailed Solution for Test: Digital Electronics - 1 - Question 5

When the input voltage (Vin) to an ADC0801 is 0.99 V, the digital output after the INTER (Interrupt) signal goes low is 0011 0011. The INTER signal going low indicates that the analog-to-digital conversion is complete and the digital output is ready to be read.

Calculation Steps

The digital output of an ADC is determined by the following formula:
Digital Value = (V_in / V_ref) * 2^n

Here is a breakdown of the calculation for this specific case:

  1. Define the variables:

    • V_in (Input Voltage): 0.99 V (given).

    • V_ref (Reference Voltage): For the ADC0801, a standard V_ref is 5 V.

    • n (Number of bits): The ADC0801 is an 8-bit converter, so n = 8. This means there are 2⁸, or 256, possible digital values.

  2. Calculate the decimal equivalent:

    • Substitute the values into the formula:
      Decimal Value = (0.99 V / 5 V) * 256

    • Decimal Value = 0.198 * 256

    • Decimal Value = 50.688

  3. Round to the nearest integer:

    • Since the ADC can only produce integer values, the result is rounded to the nearest whole number, which is 51.

  4. Convert to binary:

    • The final step is to convert the decimal value 51 into an 8-bit binary number.

    • 51 in binary is 110011.

    • To express this as an 8-bit value, it is padded with leading zeros: 0011 0011.

Test: Digital Electronics - 1 - Question 6

As access time is decreased, the cost of memory

Test: Digital Electronics - 1 - Question 7

Assertion (A): Hamming code is commonly used for error correction

Reason (R): In Hamming code the number of parity bits increases as the number of information bits increases.

Test: Digital Electronics - 1 - Question 8

A 2 bit binary multiplier can be implemented using

Test: Digital Electronics - 1 - Question 9

A microcomputer has memory locations from 0000 to FFFF, each storing 1 byte. How many bytes can be the memory store?

Detailed Solution for Test: Digital Electronics - 1 - Question 9

To determine the total number of bytes the memory can store, we calculate the number of memory locations from 0000 to FFFF in hexadecimal.

  • The range 0000 to FFFF represents all hexadecimal values from 0 to 65535 in decimal.
  • The number of memory locations is FFFF16+1=6553610 FFFF_{16} + 1 = 65536_{10} FFFF16​+1=6553610​ (since it includes both 0000 and FFFF).
  • Each location stores 1 byte, so the total memory capacity is 65536 bytes.

Thus, the memory can store 65536 bytes.

Test: Digital Electronics - 1 - Question 10

Typical size of digital IC is about

Test: Digital Electronics - 1 - Question 11

A clock signal coordinates the working of different flip flops.

Test: Digital Electronics - 1 - Question 12

In 8085, usually the vector location and the next two memory location contain a JMP instruction. This allows the programs to branch to

Test: Digital Electronics - 1 - Question 13

In which of these does thermionic emission occur?

Test: Digital Electronics - 1 - Question 14

In a positive-edge-triggered JK flip-flop, a low J and a low K produce __________ state. A high __________ on the rising edge of the clock.

Test: Digital Electronics - 1 - Question 15

The rate of change of digital signals between High and Low level is

Test: Digital Electronics - 1 - Question 16

Find the decimal value of 111001:

Test: Digital Electronics - 1 - Question 17

Which of the following is best suited for parity checking and parity generation?

Test: Digital Electronics - 1 - Question 18

In the circuit shown below, the outputs Y1 and Y2 for the given initial condition Y1 = Y2 = 1 and after four input pulses will be

Test: Digital Electronics - 1 - Question 19

The op amp is used in

Test: Digital Electronics - 1 - Question 20

Assertion (A): Power drain of CMOS increases with operating frequency

Reason (R): All unused CMOS inputs should be tied either to a fixed voltage level (0 or VDD) or to another input.

Test: Digital Electronics - 1 - Question 21

For the logic circuit of the given figure the simplified Boolean expression is

Test: Digital Electronics - 1 - Question 22

In two level logic, logic race does not occur.

Test: Digital Electronics - 1 - Question 23

A digital clock uses __________ chip

Test: Digital Electronics - 1 - Question 24

Which of the following conversion is incorrect?

Test: Digital Electronics - 1 - Question 25

The contents of stack location 2109 H after the call operation will be

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