Digital Electronics - ECE Questions and Answers

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The abbreviation DTL stands for

Digital Timing Logic

Diode Transistor Logic

Dynamic Transient Logic

Delayed Tracking Logic

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Which one of the following is a D to A conversion technique?

Successive approximation

Weighted resistor

Dual slope

Single slope

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What is the purpose of using ALE signal high?

To latch low order address from bus to separate A₀ - A₇ lines

To latch data D₀ - D₇ from bus to separate data bus

To disable data bus latch

All of the above

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To have the multiprocessing capabilities of the 8086 microprocessor, the pin connected to the ground is

DEN

ALE

INTER

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An index register in digital computer is a register to be used for

performing arithmetic and logic operations

temporary storage of result

counting number of times a program is executed

address modification purpose

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Assuming accumulator contain A 64 and the carry is set (1). What will register A and carry (CY) contain after ORA A?

A 6 H, 1

A 6 H, 0

00 H, 0

00 H, 1

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2's complement of a given 3 or more bit number of non-zero magnitude is the same as the original number if all bits except

MSB are zero

LSB are zero

MSB are 1

LSB are 1

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A half adder adds __________ bits and a full adder adds __________ bits.

two, three

three, four

four, six

two, four

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When a binary adder is used as BCD adder, the sum is

correct when it is < 9

correct when it is > 9

correct when it is < 16

none of these