151. The following waveform pattern is for a(n) ________.

(a) 2-input AND gate

(b) 2-input OR gate

(c) Exclusive-OR gate

(d) None of the above

152. The following waveform pattern is for a(n) ________.

(a) 2-input AND gate

(b) 2-input OR gate

(c) Exclusive-OR gate

(d) None of the above

153. The symbol shown represents a(n) ________.

(a) AND gate

(b) OR gate

(c) NAND gate

(d) NOR gate

154. The symbol shown represents ________.

(a) AND-OR logic

(b) AOI logic

(c) XOR gate

(d) XNOR gate

155. The expression can be directly implemented using only ________.

(a) an XOR gate

(b) an XNOR gate

(c) an AOI circuit

(d) three 2-input NAND gates

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