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Digital Electronics

Digital Electronics
The main equation for a D flip flop is

 Q=0
 Q=1
 Q=D
 Q=D'

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Digital Electronics
In which of the following codes do the successive characters differ in only 1-bit position?

 cyclic code
 2421 code
 binary code
 8421 code

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Digital Electronics
The devices commonly used for making digital circuits are

 mechanical switches
 contact switches
 relays
 semiconductor devices

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Digital Electronics
Choose the option which is not a code conversion standard

 Excess-3 code
 BCD code
 Gray code
 Truth code

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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

 8 Mhz
 2 Khz
 1 Khz
 2 Mhz

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Digital Electronics
What logic function is produced by adding an inverter to each input and output of an AND gate?

 NOR
 NAND
 X-OR
 OR

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