1. The decimal number system represents the decimal number in the form of
Correct : B. binary coded
2. 29 input circuit will have total of
Correct : D. 512 entries
3. BCD adder can be constructed with 3 IC packages each of
Correct : C. 4 bits
4. The output sum of two decimal digits can be represented in
Correct : C. bcd
5. The addition of two decimal digits in BCD can be done through
Correct : A. bcd adder
6. 3 bits full adder contains
Correct : D. 8 combinational inputs
7. The simplified expression of full adder carry is
Correct : A. c = xy+xz+yz
8. Decimal digit in BCD can be represented by
Correct : D. 4 input lines
9. The number of logic gates and the way of their interconnections can be classified as
Correct : A. logical network
10. The addition 1+1 gives 0 as a result.
Correct : A. true
11. The result of 0*1 in binary is
Correct : A. 0
12. The multiplication of 110 * 111 is performed. What is a general term used for 111?
Correct : D. multiplier
13. What do you call the intermediate terms in binary multiplication?
Correct : C. partial products
14. The result that is smaller than the smallest number obtained is referred to as
Correct : B. underflow
15. The number of sign bits in a 32-bit IEEE format is
Correct : A. 1
16. Express the decimal format of the signed binary number (101010)2 .
Correct : D. -10
17. All the comparisons made by comparator is done using
Correct : A. 1 circuit
18. One that is not the outcome of magnitude comparator is
Correct : B. a – b
19. If two numbers are not equal then binary variable will be
Correct : A. 0
20. How many inputs are required for a digital comparator?
Correct : A. 1
21. In a comparator, if we get input as A>B then the output will be
Correct : A. 1
22. Which one is a basic comparator?
Correct : A. xor
23. Comparators are used in
Correct : B. cpu
24. A circuit that compares two numbers and determine their magnitude is called
Correct : D. magnitude comparator
25. A procedure that specifies finite set of steps is called
Correct : A. algorithm
26. How many types of digital comparators are?
Correct : B. 2
27. An identify comparator is defined as a digital comparator which has
Correct : A. only one output terminal
28. A magnitude comparator is defined as a digital comparator which has
Correct : C. three output terminals
29. The purpose of a Digital Comparator is
Correct : D. to compare a set of variables or unknown numbers
30. TTL 74LS85 is a
Correct : B. 4-bit magnitude comparator
31. How many inputs will a decimal-to-BCD encoder have?
Correct : C. 10
32. How many outputs will a decimal-to-BCD encoder have?
Correct : A. 4
33. How is an encoder different from a decoder?
Correct : A. the output of an encoder is a binary code for 1-of-n input
34. If we record any music in any recorder, such types of process is called
Correct : B. encoding
35. How many OR gates are required for a Decimal-to- bcd encoder?
Correct : D. 4
36. How many OR gates are required for an octal-to- binary encoder?
Correct : A. 3
37. The discrepancy of 0 output due to all inputs being 0 or D0, being 0 is resolved by using additional input known as
Correct : A. enable
38. Can an encoder be called as multiplexer?
Correct : B. yes
39. If two inputs are active on a priority encoder, which will be coded on the output?
Correct : A. the higher value
40. What is a multiplexer?
Correct : B. a multiplexer is a device which converts many signals into one
41. Which combinational circuit is renowned for selecting a single input from multiple inputs & directing the binary information to output line?
Correct : A. data selector
42. It is possible for an enable or strobe input to undergo an expansion of two or more MUX ICs to the digital multiplexer with the proficiency of large number of
Correct : A. inputs
43. Which is the major functioning responsibility of the multiplexing combinational circuit?
Correct : C. generation of selected path between multiple sources and a single destination
44. What is the function of an enable input on a multiplexer chip?
Correct : C. to active the entire chip
45. One multiplexer can take the place of
Correct : D. several ssi logic gates or combinational logic circuits
46. A digital multiplexer is a combinational circuit that selects
Correct : A. one digital information from several sources and transmits the selected one
47. In a multiplexer, the selection of a particular input line is controlled by
Correct : B. selected lines
48. If the number of n selected input lines is equal to 2^m then it requires select lines.
Correct : B. m
49. How many select lines would be required for an 8- line-to-1-line multiplexer?
Correct : D. 3
50. A basic multiplexer principle can be demonstrated through the use of a
Correct : C. rotary switch
51. How many NOT gates are required for the construction of a 4-to-1 multiplexer?
Correct : C. 2
52. In the given 4-to-1 multiplexer, if c1 = 0 and c0 = 1 then the output M is
Correct : B. x1
53. The enable input is also known as
Correct : C. strobe
54. The full form of HDL is
Correct : C. hardware description language
55. The full form of VHDL is
Correct : B. verilog hardware description language
56. VHSIC stands for
Correct : A. very high speed integrated circuits
57. VHDL is being used for
Correct : D. all of the mentioned
58. The use of VHDL can be done in ways.
Correct : B. 3
59. At high frequencies when the sampling interval is too long in a frequency counter
Correct : D. the counter overflows
60. The output frequency related to the sampling interval of a frequency counter as
Correct : C. more precision with longer sampling interval
61. In an HDL application of a stepper motor, what is done next after an up/down counter is built?
Correct : B. test it on a simulator
62. In a digital clock application, the basic frequency must be divided down as
Correct : A. 1 hz
63. What does the data signal do in the keypad application?
Correct : A. the row and column encoded data
64. When a key is pressed, what does the ring counter in the HDL keypad application do?
Correct : A. count to find the row
65. A step which should be followed in project management is known as
Correct : B. system documentation
66. In the keypad application, the preset state of the ring counter define
Correct : D. the proper output of the row encoder
67. A major block which is not a part of an HDL frequency counter
Correct : D. bit shifter
68. A stepper motor HDL application must include
Correct : C. counters and decoders
69. Which of the following is a not a characteristics of combinational circuits?
Correct : C. the output of combinational circuit depends on previous output
70. 11 HDL MODELS OF COMBINATIONAL CIRCUITS
Correct : B. false
71. Which of the following is not a combinational circuit?
Correct : D. counter
72. In a given combinational circuit, the concurrent statements are used with selected assignments using WHEN and ELSE keyword. What is the other alternative to implement the same?
Correct : B. with-select-when
73. For using a process to implement a combinational circuit, which signals should be in the sensitivity list?
Correct : A. inputs of the circuit
74. A 4 to 16 decoder can be used as a code converter. What will be the inputs and outputs of the converter respectively?
Correct : C. hexadecimal, binary
75. Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?
Correct : D. cross coupling
76. One example of the use of an S-R flip-flop is as
Correct : C. switch debouncer
77. The truth table for an S-R flip-flop has how many VALID entries?
Correct : C. 3
78. When both inputs of a J-K flip-flop cycle, the output will
Correct : C. not change
79. Which of the following is correct for a gated D-type flip-flop?
Correct : A. the q output is either set or reset as soon as the d input goes high or low
80. A basic S-R flip-flop can be constructed by cross- coupling of which basic logic gates?
Correct : C. nor or nand gates
81. Whose operations are more faster among the following?
Correct : A. combinational circuits
82. How many types of sequential circuits are?
Correct : A. 2
83. The sequential circuit is also called
Correct : B. latch
84. The basic latch consists of
Correct : A. two inverters
85. In S-R flip-flop, if Q = 0 the output is said to be
Correct : B. reset
86. The output of latches will remain in set/reset untill
Correct : A. the trigger pulse is given to change the state
87. What is a trigger pulse?
Correct : A. a pulse that starts a cycle of operation
88. The circuits of NOR based S-R latch classified as asynchronous sequential circuits, why?
Correct : C. because of cross-coupled connection
89. A latch is an example of a
Correct : C. bistable multivibrator
90. Latch is a device with
Correct : B. two stable state
91. Why latches are called a memory devices?
Correct : C. it can store one bit of data
92. Two stable states of latches are
Correct : C. high output & low output
93. The full form of SR is
Correct : B. set reset
94. The SR latch consists of
Correct : B. 2 inputs
95. The outputs of SR latch are
Correct : D. q and q’
96. The NAND latch works when both inputs are
Correct : A. 1
97. The first step of analysis procedure of SR latch is to
Correct : B. label outputs
98. The inputs of SR latch are
Correct : C. s and r
99. When a high is applied to the Set line of an SR latch, then
Correct : A. q output goes high
100. When both inputs of SR latches are low, the latch
Correct : C. it remains in its previously set or reset state