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Digital Electronics

Digital Electronics
The fan put of a 7400 NAND gate is

2TTL
8TTL
5TTL
10TTL

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Digital Electronics
Dual slope ADC has R = 1 KΩ and C = 0.22 nanofarad has charging and discharge times for some voltage is 9 ns and 3 ns respectively. The reference Voltage is 2.2 V. What is the peak voltage reached by triangular wave during charging?

 30 mV.
 300 mV.
 90 mV.
 900 mV.

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Digital Electronics
The voltage levels for negative logic system

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

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Digital Electronics
If a counter having 10 flip flops is initially at 0, What count will if hold after 2060 pulses?

  000 000 1000.
 000 001 1100.
  000 000 1100.
 000 000 1110.

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Digital Electronics
If two numbers in excess-3 code are added and the result is less than 9, then to get equivalent binary

 0110 is subtracted
 0011 is subtracted
 0110 is added
 0011 is added

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Digital Electronics
What is mean by FPU

 floating point universal
 floating point unit
 floating parallel unit
 floating parallel universal

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