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Digital Electronics

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

 TTL.
 All have same speed.
 DTL.
 RTL.

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Digital Electronics
The simplified block diagram of a 10-bit A/D converter of dual slope integrator type is shown in figure. The 10-bit counter at the output is clocked by a 1 Mhz clock. Assuming negligible timing overhead for the control logic, the maximum frequency of the analog signal that can be converted using this A/D converted is approximately .

 500 Hz.
  1 KHz.
 250 Hz.
 2 KHz.

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Digital Electronics
Why decoder is used in the digital electronics ?

 It is used to separate address bus and data bus
 To convert non coded information into coded form
None of these
 To convert coded information into non coded form

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Digital Electronics
The data bus width of a ROM of size 2048 × 8 bits is

 12
 16
 10
 8

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Digital Electronics
In signed magnitude representation, the binary equivalent of 22.5625 is (the bit before comma represents the sign)

 1,10110.1001
 0,10110.1011
 0,10110.1001
 1,10101.1001

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Digital Electronics
An X-OR gate gives a high output

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

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