Online Digital Electronics Test - Digital Electronics Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The area represented by #4 in the given figure is the ________ level.

HIGH

LOW

off

unacceptable

[#]

The ________ number system has a base of sixteen.

Johnson

hexadecimal

binary

octal

[#]

The term "hex inverter" refers to:

an inverter that has six inputs

six inverters in a single package

a six-input symbolic logic device

an inverter that has a history of failure

[#]

The term synchronous, as applied to counter operations, means that the counter is clocked such that each flip-flop in the counter is triggered at the same time.

True

False

[#]

In order to check the CLR function of a counter, ________.

apply the active level to the CLR input and check all of the Q outputs to see if they are all in their reset state

ground the CLR input and check to be sure that all of the Q outputs are LOW

connect the CLR input to V_cc and check to see if all of the Q outputs are HIGH

connect the CLR to its correct active level while clocking the counter; check to make sure that all of the Q outputs are toggling

[#]

How many combinations are handled in an LUT?

[#]

The hard core portions of FPGAs are reprogrammable in the field.

True

False

[#]

What is the result of taking more samples during the quantization process?

More errors in the analog-to-digital conversion

More bit requirements

More accurate signal representation

More bit requirements and more accurate signal representation

[#]

Subtract the following binary numbers.

0101 1000		1010 0011		1101 1110
–0010 0011		–0011 1000		–0101 0111

0011 0100 0110 1010 1000 0110

0011 0101 0110 1011 1000 0111

0011 0101 0110 1010 1000 0111

0011 0101 0110 1010 1000 0110

[#]

10.

Add the following hexadecimal numbers.

3C		14		3B
+25		+28		+DC

60 3C 116

62 3C 118

61 3C 117

61 3D 117

[#]

11.

The binary subtraction 0 – 0 =

difference = 0
borrow = 0

difference = 1
borrow = 0

difference = 1
borrow = 1

difference = 0
borrow = 1

[#]

12.

ALU circuits cannot be cascaded to perform functions on more than four bits.

True

False

[#]

13.

Binary multiplication is like decimal multiplication except you deal only with 1s and 0s.

True

False

[#]

14.

The binary adder circuit is designed to add ________ binary number(s) at a time.

[#]

15.

To make an eight-bit adder from two four-bit adders you must connect ________.

the high-order carry-in to ground

the low-order carry-out to the high-order carry-in

the high-order carry-out to ground

the low-order sum to the high-order data input

[#]

16.

In order to select data input I5 of a 74151 eight-line multiplexer, the select inputs must be ________.

[#]

17.

The full-step sequence of a stepper motor always has two coils energized in any state of the sequence and typically causes ________ of shaft rotation per step.

5°

10°

15°

20°

[#]

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.

Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?

monostable

pulse stretching

Schmitt triggering

astable

[#]

20.

The contents of the accumulator after this operation
MOV A,#0BH
ANL A,#2CH
will be

11010111

11011010

00001000

00101000

[#]

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