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Digital Electronics

Digital Electronics
Four ROM chips of 16 × 4 size have their address buses connected together. This system will be of size

 256 × 1
 32 × 8
 16 × 16
 64 × 4

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Digital Electronics
The output of a NOR gate is high

 only when all the inputs are high
 only when all the inputs are low
 only when at least one input is high
 only when at least one input is low

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Digital Electronics
Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is.

10 CPS
120 CPS
None of these
12 CPS

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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?

 900 mV.
 30 mV.
 300 mV.
 90 mV.

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Digital Electronics
The universal gate is ___________

OR gate
None of these
AND gate
NAND gate

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Digital Electronics
8421 code is

 weighted code
 non-weighted code
 alphanumeric code
 self-complementing code

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