Digital Electronics - ECE Questions and Answers

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Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after ACI 0 A4 H?

4 AH, 0

4 AH, 1

4 BH, 0

4 BH, 1

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For the shaded area in Venn diagram of the given figure, the Boolean expression is

AB + BC + CA

ABC + A B C

ABC+AB

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If an inverter is placed at the input to an SR flip-flop, the result is

T flip-flop

D flip-flop

JK flip-flop

BCD decade counter

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What is the direction of control bus?

Unidirectional into μp

Unidirection out of μp

Bidirectional

Mixed direction, i.e., some lines into μp an some others out of μp

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How many zone bits are there?
The 8156 of a figure has RAM locations from 2000 H to 20 FFH.

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Which of the following is equivalent to AND-OR realization?

NAND-NOR

NOR-NOR

NOR-NAND

NAND-NAND

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How many different BCD number can be stored in a register containing 12 switches using an 8, 4, 2, 1 code?

100

999

1000

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An SR flip flop can be built using

NOR gate only

NAND gate only

either NOR or NAND gates

neither NOR nor NAND gates

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Which one of the following is correct?

RAM is a volatile memory but ROM is non-volatile memory

RAM is non-volatile memory but ROM is volatile memory

Both ROM and RAM are volatile but in ROM data is not lost when power is switched off

Both ROM and RAM are non-volatile but in RAM data is lost when power is switched off