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Digital Electronics

Digital Electronics
A gate is inhibited when its inhibit input is at logic 1. The gate is

 none of these
 OR
 NAND
 AND

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

128
64
32
6

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Digital Electronics
The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to negative logic system.

 1 V and 5 V
 –1.5 V and – 0.5 V
 5 V and 0 V
 0 V and 5 V

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Digital Electronics
The number A = 01110000 and B = 10101111 are in 2’s complement form .Addition of above two number is

 10101111
 11100000
 011100001
 00011111

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Digital Electronics
The voltage levels for negative logic system

 must necessarily be negative
 must necessarily be 0 V and –5 V
 may be negative or positive
 must necessarily be positive

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Digital Electronics
A device which converts BCD into octal is called

 encoder
 decoder
 demultiplexer
 code converter

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