Digital Logic Design Mid - I, September - 2011

1.The minimum number of bits required to code 2n distinct quantities is
  • n
  • 2n
  • n^2
  • none
Answer: A
2.A literal is a ________________ variable.
  • complemented
  • uncomplemented
  • both
  • A or B
Answer: D
3.A Binary Cell has _________________ stable states
  • 4
  • 2
  • 3
  • 1
Answer: B
4.The operator precedence for evaluating Boolean expressions is
  • parentheses, NOT, OR, AND
  • parentheses, AND , OR, NOT
  • parentheses, NOT, AND, OR
  • parentheses, OR, AND, NOT
Answer: C
5.A literal is a primed variable.
  • TRUE
  • FALSE
  • both
  • none
Answer: A
6.The operator symbol סּ indicates
  • equality
  • coincidence
  • Ex-clusive NOR
  • All
Answer: D
7.Half - Adder circuit needs _____ binary inputs and ____binary outputs.
  • 1, 1
  • 1, 2
  • 2, 2
  • 2, 1
Answer: C
8.NAND gate is also called as
  • Inverter
  • Bubbled – OR
  • Bubbled – AND
  • All
Answer: B
9.(0.93)10 = ( ___________ ) 8
  • 0.55
  • 0.7341
  • 0.17
  • 0.258
Answer: B
10.In Binary Addition, 1 1 = ______________
  • 10
  • 1
  • 0
  • All
Answer: A
11.Karnaugh Map is also known as ___________________________________.
Answer: Veitch diagram
12.Universal Logic Gates are _______________ and ___________________.
Answer: NAND, NOR
13.De-Morgan’s Laws are ______________________ and __________________.
Answer: -- AB = -A + -B and ---A + B = -A . -B
14.EBCDIC stands ________________________________________.
Answer: Extended Binary Coded Decimal Interchange Code
15.In ____________________, only one output line will be there irrespective any number of input lines.
Answer: Multiplexer
16.The BCD equivalent of 70 is _________________________.
Answer: 01110000
17.VHDL stands ______________________________________.
Answer: Very High Speed Integrated Circuit Hardware Description Language
18.BCD is ____________________ code.
Answer: Weighted
19.Dual of A.1 = A is ______________________.
Answer: A + 0 = A
20.In Ex-NOR truth table, output for input combination of 1 and 0 is ________.
Answer: 0