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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Memory devices that use electronic latching circuits are called ________.

RAM

flip-flops

magnetic tape

DRAM

[#]

A logic probe is used to test the pins of a 7411 IC with the following results. Is there a problem with the chip and if so, what is the problem?

Pin 6 should be ON.

Pin 6 should be pulsing.

Pin 8 should be ON.

no problem

[#]

When four 1s are taken as a group on a Karnaugh map, the number of variables eliminated from the output expression is ________.

[#]

In VHDL, data can be each of the following types except ________.

BIT

BIT_VECTOR

STD_LOGIC

STD_VECTOR

[#]

For an S-R flip-flop to be set or reset, the respective input must be:

installed with steering diodes

in parallel with a limiting resistor

LOW

HIGH

[#]

How many flip-flops are required to make a MOD-32 binary counter?

[#]

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

10%

20%

50%

80%

[#]

The 74194 4-bit bidirectional universal shift register has a wide range of applications.

True

False

[#]

On a CD-ROM, ________ are raised areas representing a 1.

mounds

lands

holes

pits

[#]

10.

Most flash chips use a bulk erase operation in which all cells on the chip are erased simultaneously.

True

False

[#]

11.

The PCI bus is a good example of an external bus for personal computers.

True

False

[#]

12.

Power dissipation is a measure of a circuit's noise immunity.

True

False

[#]

13.

An input to the mode pin of an arithmetic/logic unit (ALU) determines if the function will be:

one's-complemented

arithmetic or logic

positive or negative

with or without carry

[#]

14.

A 4-bit R/2R D/A converter has a reference of 5 V. What is the analog output for the input code 0101?

3.125 V

0.3125 V

0.78125 V

–3.125 V

[#]

15.

A DAC is monotonic if its output increases as its binary input is incremented from one value to the next.

True

False

[#]

16.

What is the output voltage V_out for the given circuit if the input voltage changes to 0 V?

+12 V

+15 V

+3 V

0 V

[#]

17.

Why is the operating frequency for CMOS devices critical for determining power dissipation?

At low frequencies, power dissipation increases.

At high frequencies, the gate will only be able to deliver 70.7 % of rated power.

At high frequencies, charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.

At high frequencies, the gate will only be able to deliver 70.7 % of rated power and charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.

[#]

18.

A comparator simply outputs a HIGH or LOW based on a comparison of the voltage levels at its input.

True

False

[#]

19.

The 8051 has ________ 16-bit counter/timers.

[#]

20.

A Celsius thermometer is an application for the 8051 microcontroller.

True

False

[#]

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