Exercise: Digital Electronics

Questions for: Digital Electronics

An AND gate has two inputs A and B and one inhibit input 3, Output is 1 if
A:
A = 1, B = 1, S = 1
B:
A = 1, B = 1, S = 0
C:
A = 1, B = 0, S = 1
D:
A = 1, B = 0, S = 0
Answer: B

All AND inputs must be 1 and inhibit 0 for output to be 1.

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The circuit of the given figure realizes the function
A:
Y = (A + B) C + DE
B:
Y = A + B + C + D + E
C:
AB + C +DE
D:
AB + C(D + E)
Answer: A

or

Y = (A + B)C + DE.

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Decimal 43 in hexadecimal and BCD number system is respectively.
A:
B2, 01000011
B:
2B, 01000011
C:
2B, 00110100
D:
B2, 01000100
Answer: B

(43)10 = (2B)16

(43)10 = (01000011)2 .

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An 8 bit DAC has a full scale output of 2 mA and full scale error of Âą 0.5%. If input is 10000000 the range of outputs is
A:
994 to 1014 ΞA
B:
990 to 1020 ΞA
C:
800 to 1200 ΞA
D:
none of the above
Answer: A

10000000 = 128, 11111111 = 255

If there is no error, output = = 1004ΞA.

Maximum error =

Hence range of output 994 to 1014 ΞA.

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The expression Y = pM (0, 1, 3, 4) is
A:
POS
B:
SOP
C:
Hybrid
D:
none of the above
Answer: A

This is product of sums expression.

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