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Digital Electronics

Digital Electronics
Which of the following logic circuits is the fastest ?

 DTL.
 RTL.
 All have same speed.
 TTL.

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Digital Electronics
An X-OR gate gives a high output

 if there are odd number of 1s
 for odd decimal value.
 if it has even number of 0s
 if the decimal value of digital word is even

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

 0 and 3
 1 and 4
 1 and 3
 0 and 4

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Digital Electronics
In Boolean algebra A.A is equal to

 A
 1
 A²
 2A

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Digital Electronics
Master-slave flip flop consists of ________ flip-flop(s).

 2
 3
 4
 1

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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

 2 Mhz
 8 Mhz
 1 Khz
 2 Khz

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