| 81. | There are________________ basic types of flip-flop based on clock trigger. |
| a. | 2 |
| b. | 6 |
| c. | 8 |
| d. | 4 |
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Answer: (d).4
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| 82. | The characteristic equation of any flip-flop describes the __________________ of the next state in terms of the present state and inputs. |
| a. | Impact |
| b. | Behavior |
| c. | Path |
| d. | None of the above |
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Answer: (b).Behavior
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| 83. | The normal data inputs to a flip-flop (D, S and R, J and K, T) are referred to as ________________ inputs. |
| a. | Sequential |
| b. | Asynchronous |
| c. | Synchronous |
| d. | Both a and b |
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Answer: (c).Synchronous
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| 84. | Asynchronous inputs, just like synchronous inputs, can be engineered to be ______________. |
| a. | Active-Medium |
| b. | Active-Low |
| c. | Active-High |
| d. | Both b and c |
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Answer: (d).Both b and c
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| 85. | ___________ and Clear should not be 0 at the same time; otherwise, both the outputs will be 1, which is known as invalid state. |
| a. | Preset |
| b. | Post set |
| c. | Fixed |
| d. | Both a and b |
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Answer: (a).Preset
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| 86. | Which table indicates the input conditions of the flip-flops necessary to cause all possible next state transitions of a flip-flop? |
| a. | T characteristic |
| b. | Truth |
| c. | Flip- flop excitation |
| d. | Excitation |
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Answer: (c).Flip- flop excitation
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| 87. | When a circuit is self- correcting? |
| a. | If there are N-1 cycles among its unused states |
| b. | If there are N-1 cycles among its used states |
| c. | If there are no cycles among its used states |
| d. | If there are no cycles among its unused states |
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Answer: (d).If there are no cycles among its unused states
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| 88. | A PLA consists of two-level____________ circuits on a single chip. |
| a. | AND-OR |
| b. | NOR-NAND |
| c. | XOR-AND |
| d. | OR-NAND |
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Answer: (a).AND-OR
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| 89. | In which of the following types of counters, the flip-flops do not change states at exactly the same time? |
| a. | Decade counter |
| b. | Asynchronous counter with MOD < 2^n |
| c. | Asynchronous ripple counter |
| d. | Cascading asynchronous counter |
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Answer: (c).Asynchronous ripple counter
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| 90. | The number of states through which the counter goes is also known as ____________. |
| a. | Counter |
| b. | Latch circuit |
| c. | Multiplexer |
| d. | MOD number |
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Answer: (d).MOD number
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