Electronics and Communication Engineering - Digital Electronics

6. 

A device which converts BCD to seven segment is called

A. encoder
B. decoder
C. multiplexer
D. none of these

Answer: Option B

Explanation:

Decoder converts binary/BCD to alphanumeric.


7. 

In 2's complement representation the number 11100101 represents the decimal number

A. +37
B. -31
C. +27
D. -27

Answer: Option D

Explanation:

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


8. 

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: Option C

Explanation:

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


9. 

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: Option C

Explanation:

1000 equals decimal 8 Therefore all segments will lit up.


10. 

A ring counter with 5 flip flops will have

A. 5 states
B. 10 states
C. 32 states
D. infinite states

Answer: Option A

Explanation:

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