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Digital Electronics

Digital Electronics
It is desired to have a 64 × 8 ROM. The ROMs available are of 16 × 4 size. The number of ROMs required will be

 6
 4
 8
 2

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Digital Electronics
In which of the following base systems is 123 not a valid number?

Base 8
Base 16
Base 10
Base 3

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Digital Electronics
(44)8 in BCD 8421 code is

 01100011
 00100100
 01000100
 00110110

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Digital Electronics
The number of digit 1 present in the binary representation of (3 × 512 + 7 × 64 + 5 × 8 + 3) is

 9
 7
 6
 8

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Digital Electronics
The momentary change in the output/state of the flip-flops is known as

 tri-state
 unstable state
 inverter
 trigger

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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?

 300 mV.
 90 mV.
 30 mV.
 900 mV.

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