13) Which of the following gates are added to the inputs of the OR gate to convert it to the NAND gate ?

14) The EXCLUSIVE NOR gate is equivalent to which gate followed by an inverter

15) A one-to-four line demultiplexer is to be implemented using a memory. How many bits must each word have ?

16) What logic function is produced by adding an inverter to the output of an AND gate

17) Which of the following gates is known as coincidence detector