Q.1
How is an encoder different from a decoder?
  • the output of an encoder is a binary code for 1-of-n input
  • the output of a decoder is a binary code for n-of-1 output
  • the output of an encoder is a binary code for n-of-1 output
  • the output of a decoder is a binary code for 1-of-n input
Q.2
What is a multiplexer?
  • it is a type of decoder which decodes several inputs and gives one output
  • it takes one input and results into many output
  • a multiplexer is a device which converts many signals into one
  • it is a type of encoder which decodes several inputs and gives one output
Q.3
Binary coded decimal is a combination of
  • two binary digits
  • three binary digits
  • four binary digits
  • five binary digits
Q.4
What is the function of an enable input on a multiplexer chip?
  • to apply vcc
  • to active the entire chip
  • to connect ground
  • to active one half of the chip
Q.5
Which is the major functioning responsibility of the multiplexing combinational circuit?
  • decoding the binary information
  • encoding of binary information
  • generation of selected path between multiple sources and a single destination
  • generation of all minterms in an output function with or-gate
Q.6
Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?
  • low input voltages
  • synchronous operation
  • gate impedance
  • cross coupling
Q.7
In which of the following gates the output is 1 if and only if at least one input is 1?
  • and
  • nor
  • nand
  • or
Q.8
Which of the following combinations of logic gates can decode binary 1101?
  • one 4-input and gate
  • one 4-input and gate, one inverter
  • one 4-input and gate, one or gate
  • one 4-input nand gate, one inverter
Q.9
Which of following are known as universal gates?
  • nand & nor
  • and & or
  • xor & or
  • ex-nor & xor
Q.10
Can an encoder be called as multiplexer?
  • no
  • yes
  • sometimes
  • never
Q.11
The prime implicant which has at least one element that is not present in any other implicant is known as
  • essential prime implicant
  • implicant
  • complement
  • prime complement
Q.12
The NAND latch works when both inputs are
  • 1
  • 0
  • inverted
  • don’t cares
Q.13
What type of logic circuit is represented by the figure shown below?
  • xor
  • xnor
  • and
  • xand
Q.14
How many bits would be required to encode decimal numbers 0 toin straight binary codes?
  • 12
  • 14
  • 16
  • 18
Q.15
What is the minimum number of two input NAND gates used to perform the function of two input OR gates?
  • one
  • two
  • three
  • four
Q.16
What do you call the intermediate terms in binary multiplication?
  • multipliers
  • mid terms
  • partial products
  • multiplicands
Q.17
The purpose of a Digital Comparator is
  • to create different outputs
  • to convert analog input into digital
  • to add a set of different numbers
  • to compare a set of variables or unknown numbers
Q.18
How many types of digital comparators are?
  • 1
  • 2
  • 3
  • 4
Q.19
Which one is a basic comparator?
  • xor
  • xnor
  • and
  • nand
Q.20
How many AND, OR and EXOR gates are required for the configuration of full adder?
  • 1, 2, 2
  • 2, 1, 2
  • 3, 1, 2
  • 4, 0, 1
0 h : 0 m : 1 s