Digital Electronics/Circuits Multiple Choice Questions on “Encoders”.
1. How many inputs will a decimal-to-BCD encoder have?
A. 4
B. 8
C. 10
D. 16
Answer: C
Clarification: An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. Thus, a Decimal-to-bcd converter has decimal values as inputs which range from 0-9. So, a total of 10 inputs are there in a decimal-to-BCD encoder.
2. How many outputs will a decimal-to-BCD encoder have?
A. 4
B. 8
C. 12
D. 16
Answer: A
Clarification: An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. Thus, a decimal to BCD encoder has 4 outputs.
3. How is an encoder different from a decoder?
A. The output of an encoder is a binary code for 1-of-N input
B. The output of a decoder is a binary code for 1-of-N input
C. The output of an encoder is a binary code for N-of-1 output
D. The output of a decoder is a binary code for N-of-1 output
Answer: A
Clarification: An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. It performs the opposite operation of a decoder which results in 2n outputs from n inputs. Thus, an encoder different from a decoder because of the output of an encoder is a binary code for 1-of-N input.
4. If we record any music in any recorder, such types of process is called ___________
A. Multiplexing
B. Encoding
C. Decoding
D. Demultiplexing
Answer: B
Clarification: If we record any music in any recorder, it means that we are giving data to a recorder. So, such process is called encoding. Getting back the music from the recorded data is known as decoding.
5. Can an encoder be a transducer?
A. Yes
B. No
C. May or may not be
D. Both are not even related slightly
Answer: A
Clarification: Of course, a transducer is a device that has the capability to emit data as well as to accept. Transducer converts signal from one form of energy to another.
6. How many OR gates are required for a Decimal-to-bcd encoder?
A. 2
B. 10
C. 3
D. 4
Answer: D
Clarification: An encoder is a combinational circuit encoding the information of 2^n input lines to n output lines, thus producing the binary equivalent of the input.
This is clear from the diagram that it requires 4 OR gates:.