Digital Electronics - ECE Questions and Answers

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A logical expression Y = A + AB is equal to

Y = AB

Y = A + B

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Using the same flip flops

a synchronous flip flop can operate at higher frequency than ripple counter

a ripple counter can operate at higher frequency than synchronous counter

both ripple and synchronous counter can operate at the same frequency

can not determine

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A 10 bit ADC with a full scale output voltage of 10.24 V is to be designed to have ± LSB/2 accuracy. If ADC is calibrated at 25°C, the maximum net temperature coefficient of ADC should not exceed

± 200 μV/°C

± 400 μV/°C

± 600 μV/°C

± 800 μV/°C

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In a three input AND gate A = 1, B = 1, C = 0 The output Y =

ABC

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DeMorgan's first theorem shows the equivalence of

OR gate and Exclusive OR gate

NOR gate and Bubbled AND gate

NOR gate and NAND gate

NAND gate and NOT gate

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0.1011₂ = __________ .

0.6875₁₀

0.6800₁₀

0.0100₁₀

0.5000₁₀

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If memory chip size is 256 x 1 bits, the number of chips required to make 1 k byte memory is

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Computers use RC circuit for edge triggering.

True

False

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The function Y = AC + BD + EF is

POS

SOP

Hybrid

none of the above