Online Digital Electronics Test - Digital Electronics Test 10

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Total number of questions: 20.
Time allotted: 30 minutes.
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If a typical PC uses a 20-bit address code, how much memory can the CPU address?

20 MB

10 MB

1 MB

580 MB

[#]

Fan-out is specified in terms of ________.

voltage

current

wattage

unit loads

[#]

Which of the following is true for a 5-variable Karnaugh map?

There is no such thing.

It can be used only with the aid of a computer.

It is made up of two 4-variable Karnaugh maps.

It is made up of a 2-variable and a 3-variable Karnaugh map.

[#]

One reason for using the sum-of-products form is that it can be implemented using all ________ gates without much difficulty.

NOR

NAND

AND

DOOR

[#]

A D flip-flop utilizing a PGT clock is in the CLEAR state. Which of the following input actions will cause it to change states?

CLK = NGT, D = 0

CLK = PGT, D = 0

CLOCK NGT, D = 1

CLOCK PGT, D = 1

CLK = NGT, D = 0, CLOCK NGT, D = 1

[#]

The duty cycle of the most significant bit from a 4-bit (0–9) BCD counter is ________.

10%

20%

50%

80%

[#]

To which pin on the RAM chip does the address decoder connect in order to signal which memory chip is being accessed?

The address input

The output enable

The chip enable

The data input

[#]

What is another name for digital circuitry called sequential logic?

logic macrocell

logic array

flip-flop memory circuitry

inverter

[#]

A GAL is a programmable/reprogrammable PAL.

True

False

[#]

10.

Which type of programming is typically used for digital signal processors?

Assembly language

Machine language

None of the above

[#]

11.

An offset error in a DAC will show up as an incorrect analog output ________.

only for higher value inputs

only for lower value inputs

only for certain (scattered) inputs

for all inputs

[#]

12.

A certain gate draws 1.8

A when its output is HIGH and 3.3 µA when its output is LOW. V_CC is 5 V and the gate is operated on a 50% duty cycle. What is the average power dissipation (P_D)?

2.55

1.27

12.75

[#]

13.

CMOS is a more dominant IC technology than TTL.

True

False

[#]

14.

A NAND gate has:

active-LOW inputs and an active-HIGH output.

active-LOW inputs and an active-LOW output.

active-HIGH inputs and an active-HIGH output.

active-HIGH inputs and an active-LOW output.

[#]

15.

The 2's-complement system is to be used to add the signed binary numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.

–113 and –114, –227

–14 and –13, –27

–11 and –16, –27

–27 and –13, –40

[#]

16.

CMOS stands for "complementary metal-oxide semiconductors" and the FETs are normally enhancement mode devices.

True

False

[#]

17.

In an HDL application of a stepper motor, after an up/down counter is built what is done next?

Build the sequencer

Test it on a simulator

Test the decoder

Design an intermediate integer variable

[#]

18.

On a binary-weighted D/A converter the least significant binary input ________.

connects to the smallest resistor

supplies the least voltage

connects to a 1 k

resistor

connects to the largest resistor

[#]

19.

When two or more inputs are active simultaneously, the process is called:

first-in, first-out processing

priority encoding

ripple blanking

first-in, first-out processing or priority encoding

[#]

20.

The number of data registers is:

[#]

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Online Digital Electronics Test - Digital Electronics Test 10

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