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Digital Electronics

Digital Electronics
A gate is enabled when its enable input is at logic 0. The gate is

 AND
 none of these
 NOR
 NAND

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Digital Electronics
A system has following negative numbers stored in binary form as shown. The wrongly stored number is

 -37 as 11011011
 -48 as 11101000
 -32 as 11100000
 -89 as 10100111

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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 .

  1 KHz.
 500 Hz.
 250 Hz.
 2 KHz.

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Digital Electronics
(44)8 in BCD 8421 code is

 00100100
 01100011
 01000100
 00110110

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Digital Electronics
The main criterion in the design of a digital circuit is reduction of

 volume
 size
 cost
 weight

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Digital Electronics
The output of a NAND gate is low

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

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