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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In positive logic, ________.

a HIGH = 1, a LOW = 0

a LOW = 1, a HIGH = 0

only HIGHs are present

only LOWs are present

[#]

Applying DeMorgan's theorem to the expression

, we get ________

[#]

A variable is a symbol used to represent a logical quantity that can have a value of 1 or 0.

True

False

[#]

What type of logic circuit is represented by the figure shown below?

XOR

XNOR

XAND

XNAND

[#]

On a master-slave flip-flop, when is the master enabled?

when the gate is LOW

when the gate is HIGH

both of the above

neither of the above

[#]

What is the preset condition for a ring shift counter?

all FFs set to 1

all FFs cleared to 0

a single 0, the rest 1

a single 1, the rest 0

[#]

The EPROM is strictly a MOS device.

True

False

[#]

When a computer is executing a program of instructions, the CPU will ________ memory locations as dictated by the program instructions.

format

scan

store data into

verify

[#]

The complex programmable logic device (CPLD) features a(n) ________ type of memory.

volatile

nonvolatile

EPROM

volitile EPROM

[#]

10.

The PAL has an AND and OR structure similar to a PROM, but in the PAL the inputs to the AND gates are programmable, whereas the inputs to the OR gate are hard-wired.

True

False

[#]

11.

The schematic editor allows you to connect with predefined logic symbols.

True

False

[#]

12.

Polling is the process of pausing the normal sequence of instructions to cause the processor to execute a separate set of I/O instructions instead.

True

False

[#]

13.

The timing diagram for a two-input NAND gate is shown below. The gate is working correctly.

True

False

[#]

14.

What is the difference between a full-adder and a half-adder?

Half-adder has a carry-in.

Full-adder has a carry-in.

Half-adder does not have a carry-out.

Full-adder does not have a carry-out.

[#]

15.

Binary division and decimal division use the same procedure.

True

False

[#]

16.

The output of the circuit in the given figure (a) at point X on figure (b) will be ________.

1.011 V

2.75 V

–1.011 V

–2.75 V

[#]

17.

To forward bias a diode, a ________ potential is needed on the ________ and a ________ is needed on the ________.

negative, cathode, positive, anode

negative, anode, positive, cathode

[#]

18.

A binary code that progresses such that only one bit changes between two successive codes is:

nine's-complement code

8421 code

excess-3 code

Gray code

[#]

19.

How is the speed–power product of a logic family determined?

The propagation delay in

s is multiplied by the power dissipation in mW.

The propagation delay in ms is multiplied by the power dissipation in

The propagation delay in ns is multiplied by the power dissipation in mW.

The propagation delay in ns is multiplied by the power dissipation in

[#]

20.

The microcontroller is useful in systems that have nonvariable programs for dedicated applications.

True

False

[#]

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