Q.1
What kind of operation occurs in a J – K flip flop when both inputs J and K are equal to 1?
  • a) Preset operation
  • b) Reset operation
  • c) Clear operation
  • d) Toggle operation
Q.2
Which of the following codes is a sequential code?
  • a) 8421 code
  • b) 2421 code
  • c) 5421 code
  • d) 2441 code
Q.3
Which of these code pairs correctly represent Digital Electronics reflective codes?
  • a) 2421 and 5211
  • b) 2421 and 8421
  • c) 5211 and 8421
  • d) 5421 and 2421
Q.4
Which of the following options correctly represent the characteristic of Excess – 3 code?
  • a) It is a reflexive as well as a sequential code
  • b) It is a reflexive code but not a sequential code
  • c) It is a sequential code but not a reflexive code
  • d) It is neither a reflexive code nor a sequential code
Q.5
The result “X + XY = X” follows which of these laws?
  • a) Consensus law
  • b) Distributive law
  • c) Duality law
  • d) Absorption law
Q.6
Which of the following options correctly represents the consensus law of Digital Circuits?
  • a) AB + AC + BC = AB + AC
  • b) AB + AC + BC = AB + AC
  • c) AB + AC + BC = AB + AC
  • d) AB + AC + BC = AB + AC
Q.7
Which of the following points is not correct regarding an Ex – NOR gate in Digital Electronics?
  • a) It is a one – bit comparator
  • b) It is a buffer
  • c) It is a one – bit inverter
  • d) It is a universal gate
Q.8
Which gate is called the anti – coincidence and coincidence gate respectively?
  • a) XNOR and XOR
  • b) AND and OR
  • c) OR and AND
  • d) XOR and XNOR
Q.9
What frequency division of the pulsed clock signal can be obtained by connecting 4 flip – flops in cascade?
  • a) 2
  • b) 4
  • c) 8
  • d) 16
Q.10
Which of the following options represent the correct reduction of XYZ + XYZ ?
  • a) 0
  • b) YZ
  • c) X + X
  • b) 2YZ
Q.11
A priority encoder has four inputs IIIand I3 where I3 has the highest priority and I0 has the least priority. If I= what will be the output?
  • a) 00
  • b) 01
  • c) 10
  • d) 11
Q.12
Which of the following options are correct for a 4×1 multiplexer?
  • a) It has four 3 – input AND gates
  • b) It has four 2 – input AND gates
  • c) It has one 3 – input AND gate
  • d) It has one 3 – input AND gate
Q.13
What determines the output from the combinational logic circuit in Digital Electronics?
  • a) Input signals from the past condition
  • b) Input signals at the present moment
  • c) Input signals from both past and present
  • d) Input signals expected in future
Q.14
Which of these pins will allow to activate and deactivate a multiplexer?
  • a) Enable pin
  • b) Selection pin
  • c) Logic pin
  • d) Preset pin
0 h : 0 m : 1 s