21) Which of the following code is a weighted code?
a) Gray
b) Excess-3
c) Shift Counter
d) 5111
22) The number of columns is a state table for a sequential circuit with ‘m’ fillip-flops and ‘n’ input is
a) m + n
b) m + 2n
c) 2m + n
d) 2m + 2n
23) The square of octal number 23 is
a) 529
b) 539
c) 551
d) 650
24) The 9’s compliment of 33 is
a) 33
b) 44
c) 39
d) 66
25) Which of the following operation is commutative but not associative?
a) AND
b) OR
c) NAND
d) XOR
26) Which is odd one in K-map?
a) Paris
b) Triples
c) Quads
d) Octets
27) Which one is not a type of shift register?
a) Bidirectional
b) Unidirectional
c) Left Shift
d) Right Shift
28) A toggle operation cannot be performed using a single
a) NOR gate
b) AND gate
c) NAND gate
d) XOR gate
29) Which of the following 4-bit numbers equals its 1’s complement?
a) 1010
b) 1000
c) no such number exists
d) none of the above
30) Minimum number of NAND gates required to implement Sum in half-adder circuit is:
a) 2
b) 3
c) 4
d) 5
Good Luck!!