Chapter#10: Function of Combinational Logic

All exercise Short Questions of Function of Combinational Logic of Digital Electronics book for BS/MSc Physics students.

Q.1 A certain application require that a 5-bit number to be decoder. Use 74HC154 decoders to implement the logic. The binary number is represented by the form A₄, A₃, A₂, A₁, A₀

Q.2 A 3-line-to-8-line decoder can be used for octal-to-decimal decoding. When a binary 101 is on the inputs, which output line is activated.

Q.3 How many 74HC154 1-to-16 decoders are necessary to decode a 6-bit binary numbers?

Q.4 Would you select a decoder/driver with active-HIGH or active-LOW outputs to drive a common-cathode 7-segment LED display?

Q.5 If LOW levels appears on pins, 1,4 and 13 of the 74HC147, indicate the state of the four outputs. All other inputs are HIGH.

Q.6 What is the  output when LOWs are applied to pins 1 and 5 of the 74HC147?

Q.7 Identify each device.

(a) 74LS157           (b) 74LS151

Q.8 Generally, how can an decoder be used as a demultiplexer?

Q.9 Describe encoding and give an example.

Q.10 Describe decoding and give an example.