27. A carry look ahead adder is frequently used for addition because
28. The counter in the given figure is
29. In register index addressing mode the effective address is given by
30. 7BF16 = __________ 2
31. For the minterm designation Y = ∑ m (1, 3, 5, 7) the complete expression is
32. Zero suppression is not used in actual practice.
33. A counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time
34. The hexadecimal number (3E8)16 is equal to decimal number
35. The number of distinct Boolean expression of 4 variables is
36. The fixed count that should be used so that the output register will represent the input for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).
37. For the K map in the given figure the simplified Boolean expression is
38. A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is
39. In a 7 segment display, LEDs b and c lit up. The decimal number displayed is
40. AB + AB =
41. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is
42. A three state switch has three outputs. These are
43. Maxterm designation for A + B + C is
44. 1's complement of 11100110 is
45. Assertion (A): A demultiplexer can be used as a decoder.Reason (R): A demultiplexer can be built by using AND gates only.
46. Assertion (A): The output of a NOR gate is equal to the complement of OR of input variables. Reason (R): A XOR gate is a universal gate.
47. The number of bits in ASCII is
48. 4 bit 2's complement representation of a decimal number is 1000. The number is
49. In a D latch
50. A 4 : 1 multiplexer requires __________ data select line.