Switching Theory and Logic Design Mid - I, February - 2011

1.Determine the value of base x if : (211)x = (152)8
  • 2
  • 10
  • 8
  • 7
Answer: D
2.For odd number of ones, at the input, the output of EX-OR gate is________
  • low
  • high
  • medium
  • all the above
Answer: B
3.The short hand notation of min term m6 is
  • ~A~B~C
  • ~A~BC
  • ABC
  • AB~C
Answer: D
4.The serial adder is a ___________circuit, the parallel adder is a ___________ circuit excluding the registers
  • sequential, sequential
  • combinational, sequential
  • combinational, combinational
  • sequential, combinational
Answer: D
5.Which of the following circuits can be used as parallel-to-serial converter
  • digital counter
  • decoder
  • multiplexer
  • de-multiplexer
Answer: C
6.Determine the value of base x, if (193)x = (623)8
  • 16
  • 4
  • 2
  • 5
Answer: A
7.Which of the following are called Universal gates
  • NAND,NOR
  • AND,OR
  • XOR XNOR
  • OR,XOR
Answer: A
8.In K-map each of the cell represents one of the _________ possible products
  • 2^n
  • 2^-n
  • n^2
  • All the above
Answer: A
9.Which of the following is an unweighted code?
  • 8421
  • excess-3 code
  • 2421
  • 63210
Answer: B
10.Which of the following circuits can be used as parallel-to-serial converter
  • digital counter
  • decoder
  • multiplexer
  • demultiplexer
Answer: C
11.Convert the binary code (110110)2 to Gray code_____________.
Answer: 101101
12.Reduction of Boolean expression AC C(A ~AB) = ______________.
Answer: C(A+B)
13.The given expression Y=AC AB BC in standard SOP form is _____________.
Answer: ABC+A~BC+AB~C+~ABC
14.Simplify the three variable expression using Boolean algebra Σm(1,3,5,7) is ______.
Answer: c
15.Any logic gate can be built using ________ gate.
Answer: NOR
16.Conversion of 0.1289062 decimal number to its hexa equivalent is ________.
Answer: (0.21)16
17.In Boolean algebra A AB=_______________.
Answer: A
18.Boolean expression xy yz ~X = __________________ on reduction.
Answer: xy+~xz
19.The given expression Y=A AB ABC in SOP form is _______________________.
Answer: ABC+A~B~C+AB~C+A~BC
20.Consider two normally open contacts in series for a normally closed relay. The logic operation performed by this circuit is ________.
Answer: NOR