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Digital Electronics

Digital Electronics
Maximum number in decimal that can be represented by 4 bits (binary) is

 7
 16
 4
 15

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Digital Electronics
A 32 × 10 ROM contains a decoder of size

 5 × 32
 32 × 10
 32 × 32
 10 × 32

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Digital Electronics
If in a base b number system, 54/4=13, the base of the number is

 8
 9
 6
 7

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Digital Electronics
What is the logic which controls a stair case light associated with two switches A and B located at the bottom and top of the stair case respectively?

 X-OR
 X-NOR
 OR
 AND

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Digital Electronics
X + X.Y = ?

 0
 X
 Y
 1

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

 1 V and -5 V
 0 V and 5 V
 –1.5 V and – 5 V
 5 V and 0 V

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