Online Digital Electronics Test - Digital Electronics Test - Random



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Instruction:

  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best :-).


1.

Sample-and-hold circuits in A/D converters are designed to:

A.
sample and hold the output of the binary counter during the conversion process
B.
stabilize the comparator's threshold voltage during the conversion process
C.
stabilize the input analog signal during the conversion process
D.
sample and hold the D/A converter staircase waveform during the conversion process

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Interfacing to the Analog World

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2.

Both registers TL0 and TL1 are needed to start Timer 0.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : The 8051 Microcontroller

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3.

The summing outputs of a half- or full-adder are designated by which Greek symbol?

A.
omega
B.
theta
C.
lambda
D.
sigma

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Digital Arithmetic Operations and Circuits

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4.

Convert each of the signed decimal numbers to an 8-bit signed binary number (two's-complement).
+7        –3        –12

A.
0000  0111    1111  1101    1111  0100
B.
1000  0111    0111  1101    0111  0100
C.
0000  0111    0000  0011    0000  1100
D.
0000  0111    1000  0011    1000  1100

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Digital Arithmetic Operations and Circuits

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5.

A frequency counter ________ a signal.

A.
measures
B.
displays
C.
measures and displays
D.
measures, displays, and generates

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Digital System Projects Using HDL

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6.

In the stepper motor, the half-step sequence is used when ________.

A.
less torque is needed
B.
larger steps are desired
C.
smaller steps are desirable
D.
more torque is needed

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Digital System Projects Using HDL

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7.

The schematic editor allows you to connect with predefined logic symbols.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Programmable Logic Device

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8.

ROMs are used to store data on a permanent basis.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Memory and Storage

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9.

A sign bit of "1" in the difference of a 2's-complement subtraction problem indicates the magnitude is negative and in true binary form.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Digital Arithmetic Operations and Circuits

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10.

The two's-complement method is used in computer systems that perform arithmetic.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Digital Arithmetic Operations and Circuits

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11.

The binary value of 1010 is converted to the product term .

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Boolean Algebra and Logic Simplification

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12.

The simplified form of .

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Combinational Logic Circuits

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13.

How many different states does a 3-bit asynchronous counter have?

A.
2
B.
4
C.
8
D.
16

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Counters

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14.

The time required to complete a conversion cycle is called conversion time.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Interfacing to the Analog World

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15.

The problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by:

A.
adding a fixed voltage-divider bias resistive network at the output of the TTL device
B.
avoiding this condition and only using TTL to drive TTL
C.
adding an external pull-down resistor to ground
D.
adding an external pull-up resistor to VCC

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Logic Families and Their Characteristics

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16.

In a positive logic system, the logic LOW could be between 0 V and 0.8 V.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Digital Concepts

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17.

One can safely state that the output lines for a demultiplexer are under the direct control of the:

A.
input data select lines.
B.
the internal AND gates.
C.
the internal OR gate.
D.
Input data line.

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : MSI Logic Circuits

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18.

Referring to the GAL diagram, which is the correct logic function?

A.
B.
C.
D.

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Combinational Logic Analysis

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19.

The inverter can be produced with how many NAND gates?

A.
1
B.
2
C.
3
D.
4

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Combinational Logic Analysis

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20.

The minimum number of flip-flops that can be used to construct a modulus-5 counter is ________.

A.
3
B.
5
C.
8
D.
10

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Counters

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