Digital Electronics

This is an MCQ-based quiz on Digital Electronics.

This includes OR operation, AND operation, and NOT operation.

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The inputs of a NAND gate are connected together. The resulting circuit is ………….

OR gate AND gate NOT gate None of the above

The NOR gate is OR gate followed by ………………

AND gate NAND gate NOT gate None of the above

In 2’s complement representation the number 11100101 represents the decimal number ……………

+37 -31 +27 -27

A decade counter skips ………..

Binary states 1000 to 1111

Binary states 0000 to 0011

Binary states 1010 to 1111

Binary states 1111 to higher

In case of OR gate, no matter what the number of inputs, a

1 at any input causes the output to be at logic 1 1 at any input causes the output to be at logic 0 0 any input causes the output to be at logic 0 0 at any input causes the output to be at logic 1.

In which of the following base systems is 123 not a valid number?

Base 10 Base 16 Base 8 Base 3

An OR gate has 6 inputs. The number of input words in its truth table are

6 32 64 128

The fan put of a 7400 NAND gate is

2TTL 5TTL 8TTL 10TTL

The universal gate is ___________

NAND gate OR gate AND gate None of the above

Which of the following expressions is in the product-of-sums form?

(A + B)(C + D) (AB)(CD) AB(CD) AB + CD

Each “0” entry in a K-map square represents _______________

A HIGH for each input truth table condition that produces a HIGH output A HIGH output on the truth table for all LOW input combinations A LOW output for all possible HIGH input conditions A DON’T CARE condition for all possible input truth table combinations

The systematic reduction of logic circuits is accomplished by _______________

Symbolic reduction TTL logic Using Boolean algebra Using a truth table

The observation that a bubbled input OR gate is interchangeable with a bubbled output AND gate is referred to as __________________

A Karnaugh map DeMorgan’s second theorem The commutative law of addition The associative law of multiplication

The Boolean expression Y = (AB)’ is logically equivalent to what single gate?

NAND NOR AND OR

An OR gate has 4 inputs. One input is high and the other three are low. The output is …….

Low

High

Alternately high and low

May be high or low depending on relative magnitude of inputs

Quiz/Test Summary