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MCQOPTIONS
This section includes 145 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Logic Design knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
After 9 counts BCD counter goes back to |
| A. | 0 |
| B. | 9 |
| C. | 1 |
| D. | 10 |
| Answer» B. 9 | |
| 52. |
Shift register that performs circular shift is called |
| A. | invalid counter |
| B. | valid counter |
| C. | ring counter |
| D. | undefined |
| Answer» D. undefined | |
| 53. |
IC type 7483 consists of |
| A. | 1bit IC |
| B. | 2bits IC |
| C. | 3bits IC |
| D. | 4bits IC |
| Answer» E. | |
| 54. |
Mater slave flip-flop can be constructed with |
| A. | SR Latch |
| B. | adder |
| C. | JK flip-flop |
| D. | multiplier |
| Answer» D. multiplier | |
| 55. |
Number of ripple counter in IC are |
| A. | 7492 |
| B. | 7493 |
| C. | 7865 |
| D. | 7654 |
| Answer» C. 7865 | |
| 56. |
The combinational circuit can be implemented with two ICS, one is 7404 and other one is? |
| A. | 7000 |
| B. | 7474 |
| C. | 7480 |
| D. | None |
| Answer» D. None | |
| 57. |
Subtractor circuit is used for |
| A. | subtraction |
| B. | comparison |
| C. | addition |
| D. | both a and b |
| Answer» E. | |
| 58. |
The input of the BCD counter is connected to the |
| A. | gate |
| B. | voltage |
| C. | pulsar |
| D. | current |
| Answer» D. current | |
| 59. |
Adder-subtractor works on |
| A. | 1's complement |
| B. | 2's complement |
| C. | 3's complement |
| D. | 9's complement |
| Answer» C. 3's complement | |
| 60. |
IC type 74195 has |
| A. | 2bit IC |
| B. | 3bit IC |
| C. | 4bit IC |
| D. | 5bit IC |
| Answer» D. 5bit IC | |
| 61. |
Boolean function is simplified using |
| A. | chart |
| B. | gate |
| C. | map |
| D. | table |
| Answer» D. table | |
| 62. |
Logic probe is used for |
| A. | testing |
| B. | debugging |
| C. | monitoring |
| D. | controlling |
| Answer» C. monitoring | |
| 63. |
7404 is a |
| A. | single inverter |
| B. | decimal inverter |
| C. | hex inverter |
| D. | binary inverter |
| Answer» D. binary inverter | |
| 64. |
IF E=0 in Up-down counter with Enable mode it means that the counter is |
| A. | enable |
| B. | disable |
| C. | running |
| D. | None |
| Answer» B. disable | |
| 65. |
Integrated circuit number 74161 has |
| A. | 8x1 multiplexers |
| B. | 3x8 decoder |
| C. | 2x1 mux |
| D. | 4bit counter |
| Answer» E. | |
| 66. |
Integrated circuit number 7493 can be connected to count from? |
| A. | 0 |
| B. | 10 |
| C. | 20 |
| D. | None |
| Answer» B. 10 | |
| 67. |
Decimal digit in BCD can be represented by |
| A. | 1 input line |
| B. | 2 input lines |
| C. | 3 input lines |
| D. | 4 input lines |
| Answer» E. | |
| 68. |
Integrated circuit number 74155 has |
| A. | 8x1 multiplexers |
| B. | 3x8 decoder |
| C. | 2x1 mux |
| D. | 4bit counter |
| Answer» C. 2x1 mux | |
| 69. |
IC of 7 segment display contains |
| A. | 4 leds |
| B. | 5 leds |
| C. | 6 leds |
| D. | 7 leds |
| Answer» E. | |
| 70. |
IC of 7 segment display is numbered as |
| A. | 7710 |
| B. | 7720 |
| C. | 7725 |
| D. | 7730 |
| Answer» E. | |
| 71. |
Full adder adds two numbers of |
| A. | 1bit |
| B. | 2bits |
| C. | 3bits |
| D. | 4bits |
| Answer» E. | |
| 72. |
74195 shift registers have |
| A. | synchronous clear mode |
| B. | asynchronous clear mode |
| C. | reset mode |
| D. | enable mode |
| Answer» C. reset mode | |
| 73. |
When the mode of adder-subtractor is 0 it will give |
| A. | A-B |
| B. | A+B |
| C. | A/B |
| D. | A*B |
| Answer» C. A/B | |
| 74. |
Lamp handball game uses application of |
| A. | unidirectional shift register |
| B. | bidirectional shift register |
| C. | serial shift register |
| D. | parallel shift register |
| Answer» C. serial shift register | |
| 75. |
Integrated circuit number 7474 consists of |
| A. | BCD to seven segment decoder |
| B. | 4 bit binary adder |
| C. | Dual D type Flip-flops |
| D. | None |
| Answer» D. None | |
| 76. |
74195 IC works as bidirectional shift register |
| A. | with parallel load |
| B. | without parallel load |
| C. | with serial load |
| D. | without serial load |
| Answer» C. with serial load | |
| 77. |
Subtraction of two numbers can be done using |
| A. | adder-subtractor |
| B. | adder |
| C. | divider |
| D. | multiplier |
| Answer» B. adder | |
| 78. |
Input to ROM 10110 produces output of |
| A. | 1001 |
| B. | 111 |
| C. | 1010 |
| D. | 101 |
| Answer» C. 1010 | |
| 79. |
To clear the flip-flops we use |
| A. | toggle switch |
| B. | push button |
| C. | Multiplexer |
| D. | Demultiplexer |
| Answer» B. push button | |
| 80. |
Decimal digits are displayed on |
| A. | input |
| B. | output |
| C. | 7segment |
| D. | flip-flop |
| Answer» D. flip-flop | |
| 81. |
When the control of shift register labeled as SH/LD =1, its means that the register is |
| A. | shifting |
| B. | storing |
| C. | loading |
| D. | adding |
| Answer» B. storing | |
| 82. |
To start the game in lamp handball the start switch start the at the |
| A. | extreme left side |
| B. | extreme right side |
| C. | both a and b |
| D. | None |
| Answer» D. None | |
| 83. |
2x1 multiplexer has |
| A. | 1select line |
| B. | 2select lines |
| C. | 3select lines |
| D. | 4select lines |
| Answer» B. 2select lines | |
| 84. |
4bit counter will be incremented by |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 85. |
IC of XOR is numbered as |
| A. | 7470 |
| B. | 7480 |
| C. | 7486 |
| D. | 7490 |
| Answer» D. 7490 | |
| 86. |
When J and complement of K are 0, flip-flop QA after the shift is |
| A. | cleared |
| B. | enabled |
| C. | reset |
| D. | defined |
| Answer» B. enabled | |
| 87. |
4 bit gray code can be converted into |
| A. | 4bit binary |
| B. | 3bit binary |
| C. | 2bit binary |
| D. | 1bit binary |
| Answer» B. 3bit binary | |
| 88. |
IC 7483 is 4-bit binary |
| A. | serial adder |
| B. | parallel adder |
| C. | serial subtract or |
| D. | parallel subtract or |
| Answer» C. serial subtract or | |
| 89. |
Half adder adds two numbers of |
| A. | 1bit |
| B. | 2bits |
| C. | 3bits |
| D. | 4bits |
| Answer» B. 2bits | |
| 90. |
ROM simulator is obtained from RAM when it is operated in the |
| A. | read only mode |
| B. | write only mode |
| C. | read and write mode |
| D. | none |
| Answer» B. write only mode | |
| 91. |
Number of gates for the full adder can be reduced if JK flip-flop is used for |
| A. | storing the carry |
| B. | subtracting the carry |
| C. | both a and b |
| D. | None |
| Answer» B. subtracting the carry | |
| 92. |
Up down counters decremented by |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 93. |
74151 IC consists of |
| A. | 4X1 mux |
| B. | 5X1 mux |
| C. | 6X1 mux |
| D. | 8X1 mux |
| Answer» E. | |
| 94. |
When Memory enabled (ME) is equal to 1 than it is |
| A. | enabled |
| B. | disabled |
| C. | reset |
| D. | cleared |
| Answer» C. reset | |
| 95. |
In BCD, the number 1010 has |
| A. | meaning |
| B. | no meaning |
| C. | value |
| D. | Vcc |
| Answer» C. value | |
| 96. |
Counters that transfer invalid states to valid states are called |
| A. | valid counters |
| B. | self-starting counters |
| C. | invalid counters |
| D. | undefined counters |
| Answer» D. undefined counters | |
| 97. |
16x4 RAM indicates that memory location are |
| A. | 4 |
| B. | 8 |
| C. | 12 |
| D. | 16 |
| Answer» E. | |
| 98. |
When the mode of adder subtractor is 0 than it |
| A. | adds |
| B. | subtracts |
| C. | divides |
| D. | multiplies |
| Answer» B. subtracts | |
| 99. |
Edge triggered flip-flops has |
| A. | 2types |
| B. | 3types |
| C. | 4types |
| D. | 5types |
| Answer» B. 3types | |
| 100. |
To start the addition carry flag is |
| A. | t flip-flops |
| B. | stored |
| C. | cleared |
| D. | loaded |
| Answer» D. loaded | |