21. Which digital system translates coded characters into a more intelligible form?
(a) encoder
(b) display
(c) counter
(d) decoder
22. A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):
(a) BCD matrix
(b) display driver
(c) encoder
(d) decoder
23. Which type of decoder will select one of sixteen outputs, depending on the 4-bit binary input value?
(a) hexadecimal
(b) dual octal outputs
(c) binary-to-hexadecimal
(d) hexadecimal-to-binary
24. In a BCD-to-seven-segment converter, why must a code converter be utilized?
(a) No conversion is necessary.
(b) to convert the 4-bit BCD into gray code
(c) to convert the 4-bit BCD into 10-bit code
(d) to convert the 4-bit BCD into 7-bit code
25. When two or more inputs are active simultaneously, the process is called:
(a) first-in, first-out processing
(b) priority encoding
(c) ripple blanking
(d) priority decoding
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- Combinational Circuits » Exercise - 16. A multiplexer is a logic circuit that : (a) accepts one input and gives several outputs (b) accepts many inputs and gives many outputs (c) accepts many inputs and gives one output (d) accepts one input and gives one output
- Combinational Circuits » IQ - 1 1. Define combinational logic ? When logic gates are connected together to produce a specified output for certain specified combinations of input variables, with no storage involved, the resulting circuit is called combinational logic. 2. Explain the design procedure for combinational circuits ? (1) The problem definition. (2) Determine the number of available input variables & required O/P variables. (3) Assigning letter symbols to I/O variables. (4) Obtain simplified Boolean expression for each O/P. (5) Obtain the logic diagram. 3. Define multiplexer ? Multiplexer is a digital switch. If allows digitalinformation from several sources to be routed onto a single output line. 4. Define Decoder ? A decoder is a multiple - input multiple output logic circuit that converts coded inputs into coded outputs where the input and output codes are different. 5. What is binary decoder ? A decoder is a combinational circuit that converts binary information from n input lines to a maximum of 2n out puts lines. 6. Define Encoder ? An encoder has 2n input lines and n output lines. In encoder the output lines generate the binary code corresponding to the input value. 7. What is priority Encoder ? A priority encoder is an encoder circuit that includes the priority function. In priority encoder, if 2 or more inputs are equal to 1 at the same time,…