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Computer Science
1000 Digital Circuits
Quiz 3
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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
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