Exercise: Digital Electronics

Questions for: Digital Electronics

The circuit of the given figure is
A:
full adder
B:
full subtractor
C:
shift register
D:
decade counter
Answer: B

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A 4 input AND gate is equivalent to
A:
4 switches in parallel
B:
2 switches in series and 2 in parallel
C:
three switches in parallel and one in series
D:
4 switches in series
Answer: D

All the switches have to be closed so that the circuit can be made. In AND gate all the inputs have to be high for output to be high.

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Logic hardware is available only in NAND and NOR.
A:
True
B:
False
C:
D:
Answer: B

Other gates are also available.

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Decimal number 46 in excess 3 code =
A:
1000 1001
B:
0111 1001
C:
0111 1111
D:
1000 1111
Answer: B

Decimal 46 in excess 3 code = 46 + 33 = 79 in decimal = 0111 1001 in 4 bit binary.

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Hexadecimal number E is equal to binary number
A:
1110
B:
1101
C:
1001
D:
1111
Answer: A

E = 14 in decimal or 1110 (8 + 4 + 2 + 0 = 14) is binary.

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