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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An informational signal that makes use of binary digits is considered to be:

solid state

digital

analog

non-oscillating

[#]

The 2's complement of a binary number is derived by adding 1 to the 1's complement.

True

False

[#]

The basic types of programmable arrays are made up of ________.

AND gates

OR gates

NAND and NOR gates

AND gates and OR gates

[#]

The gates in this figure are implemented using TTL logic. If the output of the inverter has an internal open circuit, what voltage would you expect to measure at the inverter's output?

Less than 0.4 V

1.6 V

Greater than 2.4 V

All of the above

[#]

In Boolean algebra, A + 1 = 1.

True

False

[#]

Which of the following expressions is in the sum-of-products form?

(A + B)(C + D)

(AB)(CD)

AB(CD)

AB + CD

[#]

Which is not a real advantage of HDL?

Using higher levels of abstraction

Tailoring components to exactly fit the needs of the project

The use of graphical tools

Using higher levels of abstraction and tailoring components to exactly fit the needs of the project

[#]

A 555 timer is connected for astable operation as shown below along with the output waveform. It is determined that the duty cycle should be 0.5. What steps need to be taken to correct the duty cycle, while maintaining the same output frequency?

Increase the value of C.

Increase V_cc and decrease R_L.

Decrease R₁ and R₂.

Decrease R₁ and increase R₂.

[#]

When the output of the NOR gate S-R flip-flop is

and

, the inputs are

True

False

[#]

10.

Assume an

latch, made from cross-coupled NAND gates, has a 0 on both inputs. The outputs will be ________.

[#]

11.

What function will the counter shown below be performing during period "B" on the timing diagram?

Counting up

Counting down

Inhibited

[#]

12.

A device that needs constant refreshing to avoid losing data is a(n) ________.

SRAM

DRAM

ROM

EPROM

[#]

13.

Which one of the following is an embedded function of the Stratix II FPGA?

AND-OR logic

Programmable SOP

Digital signal processing

None of the above

[#]

14.

The original Pentium was the first CPU to feature separate data and instruction caches.

True

False

[#]

15.

The carry-out of a full adder is ________.

[#]

16.

When the output of a standard TTL gate is HIGH, it can ________.

sink 16 mA of current from the attached input gates

source 400

A of current to no more than 10 attached gates

source 16 mA of current to no more than 10 attached gates

sink a maximum of 400

A from no more than 10 load gates

[#]

17.

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

[#]

18.

Most modern digital systems are based on semiconductor technology.

True

False

[#]

19.

If V_cc of a 555 timer circuit is set to +10 V what is the level of output voltage from the circuit?

V_OH = 10 V, V_OL = 0 V

V_OH = 10 V, V_OL = 0.1 V

V_OH = 8.5 V, V_OL = 0 V

V_OH = 8.5 V, V_OL = 0.1 V

[#]

20.

A Celsius thermometer is an application for the 8051 microcontroller.

True

False

[#]

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