Exercise: Digital Electronics

Questions for: Digital Electronics

If all the LEDs in a seven segment display are turned on, the number displayed is
A:
1
B:
3
C:
0
D:
8
Answer: D

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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
A:
± 200 μV/°C
B:
± 400 μV/°C
C:
± 600 μV/°C
D:
± 800 μV/°C
Answer: A

, accuracy = 5 mV, temp, .

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Using the same flip flops
A:
a synchronous flip flop can operate at higher frequency than ripple counter
B:
a ripple counter can operate at higher frequency than synchronous counter
C:
both ripple and synchronous counter can operate at the same frequency
D:
can not determine
Answer: A

In a synchronous counter clock pulses are applied to all flip-flops simultaneously. Hence minimum time delay and high frequency.

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A logical expression Y = A + AB is equal to
A:
Y = AB
B:
Y = AB
C:
Y = A + B
D:
Y = A + B
Answer: D

Y = A + A B = (A + A) (A + B) = (A + B).

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A presettable counter with 4 flip flops can start counting from
A:
0000
B:
1000
C:
any number from 0000 to 1000
D:
any number from 0000 to 1111
Answer: D

Since 4 flip-flops are used it can count from 0000 to 1111. By presetting it can start from any number.

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