Online Digital Electronics Test - Digital Electronics Test 6

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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 horizontal axis of an oscilloscope is normally calibrated in units of ________.

voltage

current

time

frequency

[#]

Which of the following combinations cannot be combined into K-map groups?

Corners in the same row

Corners in the same column

Diagonal corners

Overlapping combinations

[#]

If an active-HIGH S-R latch has a 0 on the S input and a 1 on the R input and then the R input goes to 0, the latch will be ________.

SET

RESET

clear

invalid

[#]

Which segments of a seven-segment display would be required to be active to display the decimal digit 2?

a, b, d, e, and g

a, b, c, d, and g

a, c, d, f, and g

a, b, c, d, e, and f

[#]

The address-decoding scheme for a 16K-byte EPROM memory system requires a 1-to-8-address decoder when 4K × 8 memory is used.

True

False

[#]

When the term RAM is used with semiconductor memories, it usually means ________ as opposed to ROM.

Random-Access Memory

Read/Write Memory (RWM)

flash memory

temporary storage

[#]

How many macrocells are in a MAX700S LAB?

[#]

How many pins are in an EDF10K70 package?

140

240

532

[#]

In a digital reproduction of an analog curve, accuracy can be increased by ________.

sampling the curve more often

sampling the curve less often

decreasing the number of bits used to represent each sampled value

all of the above

[#]

10.

Settling time is normally defined as the time it takes a DAC to settle within ________.

1/8 LSB of its final value when a change occurs in the input code

1/4 LSB of its final value when a change occurs in the input code

1/2 LSB of its final value when a change occurs in the input code

1 LSB of its final value when a change occurs in the input code

[#]

11.

ECL gates are noted for their high frequency capability and small output voltage swing.

True

False

[#]

12.

Three characteristics of op amps make them almost ideal amplifiers: very high input impedance, very low impedance, and ________.

very high voltage gain

unlimited bandwidth

a low slew rate

very high current gain

[#]

13.

D/A conversion is the process of taking a voltage or current and converting it to a digital code.

True

False

[#]

14.

The serial format for transmitting binary information uses:

a single conductor

multiple conductors

infrared technology

fiber-optic

[#]

15.

What is the minimum voltage required before a diode will allow current to flow between the cathode and the anode?

0.7 V

0.07 V

4.3 V

0.2 V

[#]

16.

In a priority encoder, the input with the highest priority is represented on the output.

True

False

[#]

17.

Ten TTL loads per TTL driver is known as:

noise immunity

fan-out

power dissipation

propagation delay

[#]

18.

Which of the following flip-flop timing parameters indicates the time it takes a Q output to respond to a C_p input?

t_s, t_h

t_PHL, t_PLH

t_w (L), t_w (H)

f_max

[#]

19.

Look up the propagation delay from the clock to the output for the 7476. Are the HIGH-to-LOW and LOW-to-HIGH propagation delays the same?

yes

no, t_PLH = 25 ns, t_PHL = 40 ns

no, t_PLH = 40 ns, t_PHL = 25 ns

no, t_PHL = 25 ns, t_PLH = 40 ns

[#]

20.

A monostable 555 timer has the following number of stable states:

[#]

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Online Digital Electronics Test - Digital Electronics Test 6

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