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Digital Electronics

Digital Electronics
A gate is disabled when its disable input is at logic 0. The gate is

 NOR
 AND
 OR
 none of these

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Digital Electronics
While using a frequency counter for measuring frequency, two modes of measurement are possible. 1. Period time 2. Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4Mhz the crossover frequency is given by

 1 Khz
 2 Mhz
 8 Mhz
 2 Khz

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Digital Electronics
Logic circuits are

 none of these
 digital circuits
 analog circuits
 hybrid circuits

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Digital Electronics
The inputs of a NAND gate are connected together. The resulting circuit is ___________.

None of these
AND gate
NOT gate
OR gate

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

 32 × 10
 10 × 32
 32 × 32
 5 × 32

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Digital Electronics
The voltage levels for positive logic system

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

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