Quiznetik

Digital Logic Circuits (DLC) | Set 3

1. Complement of F’ gives back

Correct : B. f

2. Decimal digit in BCD can be represented by

Correct : D. 4 input lines

3. The number of logic gates and the way of their interconnections can be classified as

Correct : A. logical network

4. EPROM uses an array of

Correct : B. n-channel enhancement type mosfet

5. The EPROM was invented by

Correct : B. dov frohman

6. Address decoding for dynamic memory chip control may also be used for

Correct : A. chip selection and address location

7. Which of the following describes the action of storing a bit of data in a mask ROM?

Correct : C. a 1 is stored by connecting the gate of a mos cell to the address line

8. The check sum method of testing a ROM

Correct : D. simply indicates that the contents of the rom are incorrect

9. The initial values in all the cells of an EPROM is

Correct : B. 1

10. To store 0 in such a cell, the floating point must be

Correct : C. charged

11. The major disadvantage of RAM is?

Correct : C. it is volatile

12. Which one of the following is used for the fabrication of MOS EPROM?

Correct : C. tms 2516

13. How many addresses a MOS EPROM have?

Correct : C. 2516

14. ROMs retain data when

Correct : D. all of the mentioned

15. When a RAM module passes the checker board test it is

Correct : C. probably good

16. What is the difference between static RAM and dynamic RAM?

Correct : C. dynamic ram must be refreshed, static ram does not

17. How many natural states will there be in a 4-bit ripple counter?

Correct : C. 16

18. A ripple counter’s speed is limited by the propagation delay of

Correct : A. each flip-flop

19. One of the major drawbacks to the use of asynchronous counters is that

Correct : B. high-frequency applications are limited because of internal propagation delays

20. Internal propagation delay of asynchronous counter is removed by

Correct : D. synchronous counter

21. How many flip-flops are required to construct a decade counter?

Correct : A. 4

22. The terminal count of a typical modulus-10 binary counter is

Correct : C. 1001

23. A ripple counter’s speed is limited by the propagation delay of

Correct : A. each flip-flop

24. A 4-bit counter has a maximum modulus of

Correct : D. 16

25. UP-DOWN counter is a combination of

Correct : D. up counter & down counter

26. UP-DOWN counter is also known as

Correct : C. multimode counter

27. In an UP-counter, each flip-flop is triggered by

Correct : B. the normal output of the preceding flip-flop

28. In DOWN-counter, each flip-flop is triggered by

Correct : D. the inverted output of the preceding flip-flop

29. Binary counter that count incrementally and decrement is called

Correct : A. up-down counter

30. Once an up-/down-counter begins its count sequence, it

Correct : D. can be altered

31. In 4-bit up-down counter, how many flip-flops are required?

Correct : C. 4

32. A modulus-10 counter must have _

Correct : B. 4 flip-flops

33. Which is not an example of a truncated modulus?

Correct : A. 8

34. The designation means that the

Correct : A. up count is active-high, the down count is active-low

35. The full form of SIPO is

Correct : A. serial-in parallel-out

36. How can parallel data be taken out of a shift register simultaneously?

Correct : D. use the q output of each ff

37. What is meant by parallel load of a shift register?

Correct : A. all ffs are preset with data

38. After three clock pulses, the register contains

Correct : C. 00101

39. What will be the 4-bit pattern after the second clock pulse? (Right-most bit first)

Correct : C. 0000

40. In digital logic, a counter is a device which

Correct : B. stores the number of times a particular event or process has occurred

41. A counter circuit is usually constructed of

Correct : C. a number of flip-flops connected in cascade

42. How many types of the counter are there?

Correct : B. 3

43. A decimal counter has states.

Correct : B. 10

44. Ripple counters are also called

Correct : B. asynchronous counters

45. Synchronous counter is a type of

Correct : C. msi counters

46. Three decade counter would have

Correct : B. 3 bcd counters

47. BCD counter is also known as

Correct : B. decade counter

48. The parallel outputs of a counter circuit represent the

Correct : D. clock count

49. The time from the beginning of a read cycle to the end of tACS/tAA is called as

Correct : D. access time

50. Why did PROM introduced?

Correct : C. to provide flexibility

51. Which of the following is programmed electrically by the user?

Correct : C. prom

52. PROMs are available in

Correct : D. mos and bipolar technologies

53. Which of the following best describes the fusible-link PROM?

Correct : D. user-programmable, one-time programmable

54. How can ultraviolet erasable PROMs be recognized?

Correct : A. there is a small window on the chip

55. Which part of a Flash memory architecture manages all chip functions?

Correct : B. floating-gate mosfet

56. How much locations an 8-bit address code can select in memory?

Correct : B. 256 locations

57. What is a fusing process?

Correct : C. it is a process by which programs are burnout to the diode/transistors

58. Fusing process is

Correct : B. irreversible

59. The cell type used inside a PROM is

Correct : C. fuse cells

60. How many types of fuse technologies are used in PROMs?

Correct : B. 3

61. Metal links are made up of

Correct : C. nichrome

62. Silicon links are made up of

Correct : A. polycrystalline silicon

63. During programming p-n junction is

Correct : A. avalanche reverse biased

64. The full form of FAMOS is

Correct : A. floating gate avalanche injection mos

65. PROM is programmed by

Correct : C. prom programmer

66. The PROM starts out with

Correct : B. 0s

67. For implementation of PROM, which IC is used?

Correct : B. ic 74186

68. IC 74186 is of

Correct : C. 512 bits

69. How many memory locations are addressed using 18 address bits?

Correct : C. 262,144

70. How many address bits are needed to operate a 2K * 8-bit memory?

Correct : B. 11

71. What is the bit storage capacity of a ROM with a 1024 × 8 organization?

Correct : D. 8192

72. The logical sum of two or more logical product terms is called

Correct : A. sop

73. The expression Y=AB+BC+AC shows the operation.

Correct : B. sop

74. The expression Y=(A+B)(B+C)(C+A) shows the operation.

Correct : B. pos

75. The canonical sum of product form of the function y(A,B) = A + B is

Correct : B. ab + ab’ + a’b

76. A variable on its own or in its complemented form is known as a

Correct : B. literal

77. Canonical form is a unique way of representing

Correct : C. boolean expressions

78. There are Minterms for 3 variables (a, b, c).

Correct : C. 8

79. Why is a demultiplexer called a data distributor?

Correct : A. the input will be distributed to one of the outputs

80. Most demultiplexers facilitate which type of conversion?

Correct : B. single input, multiple outputs

81. In 1-to-4 demultiplexer, how many select lines are required?

Correct : A. 2

82. In a multiplexer the output depends on its

Correct : B. select inputs

83. In 1-to-4 multiplexer, if C1 = 1 & C2 = 1, then the output will be

Correct : D. y3

84. How many select lines are required for a 1-to-8 demultiplexer?

Correct : B. 3

85. How many AND gates are required for a 1-to-8 multiplexer?

Correct : C. 8

86. Which IC is used for the implementation of 1-to-16 DEMUX?

Correct : A. ic 74154

87. The word demultiplex means

Correct : D. one into many as well as distributor

88. Why is a demultiplexer called a data distributor?

Correct : A. the input will be distributed to one of the outputs

89. In a multiplexer the output depends on its

Correct : B. select inputs

90. In 1-to-4 multiplexer, if C1 = 0 & C2 = 1, then the output will be

Correct : B. y1

91. In 1-to-4 multiplexer, if C1 = 1 & C2 = 1, then the output will be

Correct : D. y3

92. What is the addition of the binary numbers 11011011010 and 010100101?

Correct : C. 11101111111

93. Perform binary addition: 101101 + 011011 = ?

Correct : D. 1001000

94. Binary subtraction of 100101 – 011110 is

Correct : A. 000111

95. Perform multiplication of the binary numbers: 01001 × 01011 = ?

Correct : A. 001100011

96. 100101 × 0110 = ?

Correct : C. 101111110

97. On multiplication of (10.10) and (01.01), we get

Correct : C. 011.0010

98. Divide the binary numbers: 111101 ÷ 1001 and find the remainder

Correct : D. 0011

99. Divide the binary number (011010000) by (0101) and find the quotient

Correct : A. 100011

100. Binary subtraction of 101101 – 001011 = ?

Correct : A. 100010