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Digital Electronics

Digital Electronics
The binary number 10101 is equivalent to decimal number ___________.

27
21
12
19

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Digital Electronics
The output of a logic gate is 1 when all its inputs are at logic 1. The gate is either

 an OR or an X-OR
 a NAND or a NOR
 an AND or a NOR
 an AND or an OR

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Digital Electronics
For 4 bit parallel addition, we need ________ half adder(s) and ________ full adder(s)

 1 and 3
 0 and 3
 0 and 4
 1 and 4

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Digital Electronics
A three-state buffer has the following output states

 1, 0, float
 Both A and B
 Set, Reset, Halt
 High, Low, Float

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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
 8 Mhz
 2 Mhz
 2 Khz

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Digital Electronics
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

TTLAS
CMOS
TTLLS
ECL

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