Online Digital Electronics Test - Digital Electronics Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
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What is the resultant binary of the decimal problem 49 + 01 = ?

01010101

00110101

00110010

00110001

[#]

Binary 10111111 is ________ in hexadecimal.

BF₁₆

FB₁₆

277₁₆

10111111

[#]

An inverter output is the complement of its input.

True

False

[#]

The following waveform pattern is for a(n) ________.

2-input AND gate

2-input OR gate

Exclusive-OR gate

None of the above

[#]

The binary numbers A = 1100 and B = 1001 are applied to the inputs of a comparator. What are the output levels?

A > B = 1, A < B = 0, A < B = 1

A > B = 0, A < B = 1, A = B = 0

A > B = 1, A < B = 0, A = B = 0

A > B = 0, A < B = 1, A = B = 1

[#]

How many 3-line-to-8-line decoders are required for a 1-of-32 decoder?

[#]

A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

The output of the gate appears to be open.

The dim indication on the logic probe indicates that the supply voltage is probably low.

The dim indication is a result of a bad ground connection on the logic probe.

The gate may be a tristate device.

[#]

When the output of the NOR gate S-R flip-flop is in the HOLD state (no change), the inputs are ________.

S = 1, R = 1

S = 1, R = 0

S = 0, R = 1

S = 0, R = 0

[#]

Most people would prefer to use ________ over HDL.

graphic descriptions

functions

VHDL

AHDL

[#]

10.

Erasing or programming a flash memory device is a one-step operation.

True

False

[#]

11.

DRAM uses a cross-transistor configuration.

True

False

[#]

12.

Which is a mode of operation of the GAL16V8?

Simple mode

Complex mode

Registered mode

All of the above

[#]

13.

Four subcategories of ASIC devices are available to create digital systems. These are PLDs, gate arrays, standard cells, and ________.

HCPLDs

full custom

GAL

FPLDs

[#]

14.

A NAND gate consists of an AND gate and an OR gate connected in series with each other.

True

False

[#]

15.

Solve this binary problem: 01000110 ÷ 00001010 =

0111

10011

1001

0011

[#]

16.

Which is not a step used to define the scope of an HDL project?

Are the inputs and outputs active HIGH or active LOW?

A clear vision of how to make each block work

What are the speed requirements?

How many bits of data are needed?

[#]

17.

When coming up with a strategy for dividing the overall project into manageable-size pieces one must ________.

name each input and output

fully understand how the device should operate

define successful completion of the project

know the nature of all the signals that interconnect all the pieces

[#]

18.

In a real project, the first step of definition often involves some ________ on the part of the project manager.

time

skill

research

management

[#]

19.

The stepper motor HDL will ignore its counter inputs and pass control inputs directly to the output when set in mode ________.

[#]

20.

The output of a basic 4-bit input digital-to-analog converter would be capable of outputting:

16 different values of voltage or current that are not proportional to the input binary number

16 different values of voltage or current that are proportional to the input binary number

32 different values of voltage or current that are not proportional to the input binary number

32 different values of voltage or current that are proportional to the input binary number

[#]

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Online Digital Electronics Test - Digital Electronics Test 1

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