Online Digital Electronics Test - Digital Electronics Test 5

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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 given figure is most likely a ________.

decoder

counter

multiplexer

[#]

Most computers store binary data in groups of 32 bits called Dwords.

True

False

[#]

The truth table for the SOP expression

has how many input combinations?

[#]

is in the form of a sum-of-products expression.

True

False

[#]

A J-K flip-flop excitation table lists the present state, the next state, and the J and K levels required to produce each transition.

True

False

[#]

In many cases, counters must be strobed in order to eliminate glitches.

True

False

[#]

Assume a 4-bit parallel in/serial out shift register is loaded with a binary number. How many clock pulses are required after the parallel load has occurred before the first bit in the sequence appears on the serial output line?

[#]

The 2147 4K × 1 static RAM contains 4096 storage locations storing one bit each. ________ 2147 RAM memory chip(s) is/are needed to configure an 8K × 8 memory.

One

Four

Eight

Sixteen

[#]

The distinction between CPLDs and FPGAs is ________.

well known

very small

often fuzzy

very large

[#]

10.

The GAL16V8 has architecture that is very similar to the ________ device.

PAL

PROM

PLD

SPLD

[#]

11.

NOR gates can be used to construct AND gates.

True

False

[#]

12.

A logic probe is placed on the input of a digital circuit and the probe lamp blinks slowly, indicating ________.

that an open or bad logic level exists

a high level output

a high-frequency pulse train

that the supply voltage is low

[#]

13.

A frequency counter is a circuit that can measure and display the frequency of a signal.

True

False

[#]

14.

The frequency counter measures frequency by enabling a counter to count the number of pulses of the incoming waveform during a precisely specified period of time called the sampling time.

True

False

[#]

15.

What is the resolution, in percent, of a 12-bit DAC?

8.33

0.049

0.000488

0.083

[#]

16.

________ ADCs use no clock signal, because there is no timing or sequencing required.

Actuator

Dual

Flash

Bipolar

[#]

17.

Fan-out is determined by taking the ________ result(s) of ________.

smaller,

larger,

smaller,

average,

[#]

18.

What is unique about TTL devices such as the 74SXX?

These devices use Schottky transistors and diodes to prevent them from going into saturation; this results in faster turn-on and turn-off times, which translates into higher frequency operation.

The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.

The S denotes the fact that a single gate is present in the IC rather than the usual package of 2–6 gates.

The S denotes a slow version of the device, which is a consequence of its higher power rating.

[#]

19.

This program code will be executed continuously:

STAT:	MOV A, #01H
	JNZ STAT

True

False

[#]

20.

The start-conversion on the ADC0804 is done by using the:

CS line

INTR line

V _ref/2 line

[#]

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Online Digital Electronics Test - Digital Electronics Test 5

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