1) NOT gate receives how many input a) One or more b) Two or more c) Three or more d) One 2) The dual of a Boolean expression A+B is a) AB b) A'B' c) A'+B' d) A+B 3) How many combination are there for three input gates? a) 2 b) 4 c) 6 d) 8 4) If all the inputs are HIGH then the output is HIGH a) AND b) NAND c) OR d) NOR 5) The dual of Boolean expression is A'B' a) A+B b) B+A c) A'+B' d) A'B' 6) Complement of complement of A'B+AB' is a) AB+A'B' b) (A'+B)(A+B') c) A'B+AB' d) (A'+A)(B+B') 7) X*X*X a) 0 b) X c) X' d) 1 8) In a four variable Boolean expression, a group of four 1's in the corresponding K-map will yield a term having a) 2 literals b) 1 literals c) 4 literals d) None of these 9) If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output? a) 1 b) 2 c) 7 d) 8 10) In a two variable Boolean expression, a group of four 1's in the corresponding K-map will yield a term having a) 1 literal b) 2 literal c) 3 literal d) 4 literal 11) The output of an OR gate with three inputs, A, B and C, is low when a) A =0, B=0, C=0 b) A =0, B=0, C=1 c) A =1, B=0, C=0 d) A =1, B=1, C=1 12) Logically, the output of a NOR gate would have the same Boolean expression as a(n): a) NAND gate immediately followed by an inverter b) OR gate immediately followed by an inverter c) AND gate immediately followed an inverter d) NOR gate immediately followed by an inverter 13) The output of a NOR gate is HIGH if a) all inputs are HIGH b) any input is HIGH c) any input is LOW d) all inputs are LOW 14) The Boolean expression for a 3-input AND gate is a) X = AB b) X = ABC c) X = A+B+C d) X = AB+C 15) What does the small bubble on the output of the NAND gate logic symbol mean? a) open collector output b) tristate c) The output is inverted d) None of the above 16) How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH? a) Any one of the inputs b) Any two of the inputs c) Any three of the inputs d) All four inputs 17) In the Karnaugh map for a five Boolean function, a certain group corresponds to a term having two literals. It should be a group of a) 64 b) 32 c) 128 d) None of the above 18) What is the standard form of TTL? a) Transistor-Transistor Logic b) Transistor-Transducer Logic c) Transducer-Transistor Logic d) None of the above 19) Which of the following illustrates the commutative law? a) a+0 = 0+a b) 1*a = a+1 c) ab=ba d) a+(b+c)=(a+b)+c 20) Which of the following methods is used to represent negative integer numbers? a) 1's compliment b) Sign magnitude c) 2's compliment d) All of the above 21) The number system with base 16 a) Binary b) Hexadecimal c) Decimal d) Octal 22) The ones complement of binary number 1010 is a) 0101 b) 1010 c) 0110 d) 1110 23) How many bits does the 11001010 binary number system have? a) 2 bits b) 4 bits c) 8 bits d) 10 bits 24) If a BJT transistor is conducting, the logic output is a) HIGH b) LOW c) Indeterminate d) None of the above 25) If a FET transistor is conducting, the logic output is a) HIGH b) LOW c) Indeterminate d) None of the above 26) What value is to be considered for a “don’t care condition”? a) 0 b) 1 c) Either 1 or 0 d) Any number except 1 or 0 27) The result “X + XY = X” follows which of these laws? a) Consensus law b) Distributive law c) Duality law d) Absorption law 28) Minterms are also known as a) Product term b) Sum terms c) Canonical Disjunctive Normal Form d) Canonical Conjunctive Normal Form 29) Maxterms are also known as a) Product term b) Sum terms c) Canonical Disjunctive Normal Form d) Canonical Conjunctive Normal Form

Recitation - Logic Circuits

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