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Electronics Engineering Objective Questions { Digital Circuit and Microprocessor }



190. According to Boolean algebra which of the following relation is not valid?
A. X =1
B.X+Y=Y+X
C.X.Y=Y.X
D. X + (Y+Z)= (X +Y)+Z
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191. According to Boolean algebra which of the following relation is not valid?
A. X (X + Y)= X
B. (X + Y) (X + Z) = X + YZ
C.X+XY=X+Y
D.XY+ YZ + YZ=XYZ
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192. According to Boolean algebra 1 + A + B+ C is equal to
A.A+B+C
B.ABC
C. 1 +ABC
D.1
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193. (A + B + A B) is the same as
A.0
B.1
C.C
D. T
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194. Three Boolean operators are
A. OR, NOT, AND
B. OR, NOR, NAND
C. NOT, NOR, NAND
D. None of the above
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195. The truth table given below is for
A. AND gate
B. NAND gate
C. OR gate
D. NOR gate
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196. Positive logic in a logic circuit is one in which
A. logic 0 and 1 are reprennted by 0 and positive voltage respectively
B. logic 0 and 1 are represented by negative and positive voltage respectively
C. logic 0 voltage level is higher than logic 1 voltage level
D. logic 0 voltage level is lower than logicl voltage level
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