Exercise: Digital Electronics

Questions for: Digital Electronics

A ring counter with 5 flip flops will have
A:
5 states
B:
10 states
C:
32 states
D:
infinite states
Answer: A
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BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are
A:
a, b, d
B:
a, b, c
C:
all
D:
a, b, g, c, d
Answer: C

1000 equals decimal 8 Therefore all segments will lit up.

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A decade counter skips
A:
binary states 1000 to 1111
B:
binary states 0000 to 0011
C:
binary states 1010 to 1111
D:
binary states 1111 to higher
Answer: C

A decade counter counts from 0 to 9. It has 4 flip-flops. The states skipped are 10 to 15 or 1010 to 1111.

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In 2's complement representation the number 11100101 represents the decimal number
A:
+37
B:
-31
C:
+27
D:
-27
Answer: D

A = 11100101. Therefore A = 00011010 and A' = A + 1 = 00011011 = 16 + 8 + 2 + 1 = 27. Therefore A = -27.

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A device which converts BCD to seven segment is called
A:
encoder
B:
decoder
C:
multiplexer
D:
none of these
Answer: B

Decoder converts binary/BCD to alphanumeric.

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