Digital Electronics - ECE Questions and Answers

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The universal gate is ___________

NAND gate

OR gate

AND gate

None of the above

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

128

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

Base 10

Base 16

Base 8

Base 3

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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.

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The number of Boolean functions that can be generated by n variables is equal to

2ⁿ

2²ⁿ

2^n-1

2ⁿ

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Which mechanism allocates the binary value to the states in order to reduce the cost of the combinational circuits?

State Reduction

State Minimization

State Assignment

State Evaluation

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Positive logic in a logic circuit is one in which

logic 0 and 1 are represented by 0 and positive voltage respectively

logic 0 and, -1 are represented by negative and positive voltages respectively

logic 0 voltage level is higher than logic 1 voltage level

logic 0 voltage level is lower than logic 1 voltage level.

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Digital circuit can be made by the repeated use of ___________

OR gates

NOT gates

NAND gates

None of the above

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Pick out the CORRECT statement:

In a positional number system, each symbol represents the same value irrespective of its position

The highest symbol in a position number system as a value equal to the number of symbols in the system

It is not always possible to find the exact binary

Each hexadecimal digit can be represented as a sequence of three binary symbols.