MCQOPTIONS
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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.
| 101. |
In most of the logic gates 1 means |
| A. | 0V |
| B. | 1V |
| C. | 5V |
| D. | 10V |
| Answer» D. 10V | |
| 102. |
Integrated circuit number 74157 consists of |
| A. | 2 multiplexers |
| B. | 1 Quadruple |
| C. | 3 flip-flops |
| D. | Quadruple 2 X 1 Multiplexers |
| Answer» B. 1 Quadruple | |
| 103. |
IC type 7489 is a |
| A. | ROM |
| B. | RAM |
| C. | DVD |
| D. | CD-ROM |
| Answer» C. DVD | |
| 104. |
One that is not a type of integrated circuits |
| A. | LSI |
| B. | MSI |
| C. | FSI |
| D. | SSI |
| Answer» D. SSI | |
| 105. |
BCD counter is |
| A. | 2bit |
| B. | 4bit |
| C. | 8bit |
| D. | 16bit |
| Answer» C. 8bit | |
| 106. |
For loading the data to shift register its SH/LD pin must equal to |
| A. | 1 |
| B. | 0 |
| C. | reset |
| D. | undefined |
| Answer» C. reset | |
| 107. |
Each IC is recognized by its |
| A. | Shape |
| B. | Size |
| C. | Identification number |
| D. | both a and b |
| Answer» D. both a and b | |
| 108. |
In the design procedure first step is to |
| A. | make map |
| B. | make chart |
| C. | make table |
| D. | make graph |
| Answer» D. make graph | |
| 109. |
SR latch is made up of two cross coupled |
| A. | AND gates |
| B. | OR gates |
| C. | NAND gates |
| D. | None |
| Answer» D. None | |
| 110. |
RS flip-flop works on |
| A. | 2inputs |
| B. | 3inputs |
| C. | 4inputs |
| D. | 5inputs |
| Answer» B. 3inputs | |
| 111. |
Master slave flip-flop has clock frequency minimum of |
| A. | 5KHz |
| B. | 10KHz |
| C. | 15KHz |
| D. | 20KHz |
| Answer» C. 15KHz | |
| 112. |
Read operation in memory is performed when WE is |
| A. | 1 |
| B. | 0 |
| C. | reset |
| D. | cleared |
| Answer» B. 0 | |
| 113. |
4bit parallel adder produces output of |
| A. | 1bit |
| B. | 2bits |
| C. | 3bits |
| D. | 4bits |
| Answer» E. | |
| 114. |
74195 shifter register has |
| A. | parallel load |
| B. | serial load |
| C. | parallel store |
| D. | serial store |
| Answer» B. serial load | |
| 115. |
When clear input of flip-flops goes to 0 the flip-flops become |
| A. | 1 |
| B. | 0 |
| C. | reset |
| D. | undefined |
| Answer» C. reset | |
| 116. |
The read operation is performed when WE is equal to |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 117. |
Adding 1001 and 0010 gives output of |
| A. | 1011 |
| B. | 1111 |
| C. | 0 |
| D. | 1010 |
| Answer» B. 1111 | |
| 118. |
To shift the data from right side to the shift register SH/LD pin must be equal to |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | None |
| Answer» D. None | |
| 119. |
An Open-collector gate can be operated without an external resistor if its output is connected to |
| A. | Flip-flop |
| B. | Latch |
| C. | input of another gate |
| D. | None |
| Answer» B. Latch | |
| 120. |
Adder-subtractor operating on mode 1 at (X XOR 1) gives |
| A. | 1 |
| B. | 0 |
| C. | x |
| D. | x' |
| Answer» E. | |
| 121. |
In adder-subtractor circuit when addition exceeds from 15 output carry becomes |
| A. | 1 |
| B. | 0 |
| C. | x |
| D. | undefined |
| Answer» B. 0 | |
| 122. |
SSI Circuits contain individual gates and |
| A. | Registers |
| B. | TTL |
| C. | AND gates |
| D. | Flip-flops |
| Answer» E. | |
| 123. |
D flip-flop is constructed with |
| A. | AND gates |
| B. | OR gates |
| C. | NAND gates |
| D. | NOR gates |
| Answer» D. NOR gates | |
| 124. |
7420 is the |
| A. | 4input NAND |
| B. | 3input NAND |
| C. | 5input NAND |
| D. | 6input NAND |
| Answer» B. 3input NAND | |
| 125. |
Toggle switches has value of |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | both a and b |
| Answer» E. | |
| 126. |
Serial addition can be done with |
| A. | shift register |
| B. | serial load |
| C. | load |
| D. | ring shift register |
| Answer» B. serial load | |
| 127. |
Full adder circuit uses two integrated circuits one is 7486 and other is |
| A. | 7483 |
| B. | 7500 |
| C. | 74151 |
| D. | 7400 |
| Answer» E. | |
| 128. |
Mostly gates works on |
| A. | 5V |
| B. | 4V |
| C. | 3V |
| D. | 2V |
| Answer» B. 4V | |
| 129. |
7493 IC consists of |
| A. | 1 bit ripple counter |
| B. | 2 bit ripple counter |
| C. | 3 bit ripple counter |
| D. | 4 bit ripple counter |
| Answer» E. | |
| 130. |
Two cross coupled NAND gates make |
| A. | SR Latch |
| B. | RS flip-flop |
| C. | D flip-flop |
| D. | master slave flip-flop |
| Answer» B. RS flip-flop | |
| 131. |
Integrated circuit number 7493 consists of |
| A. | 4 bit number |
| B. | 4 registers |
| C. | 2 flip-flops |
| D. | 4 flip-flops |
| Answer» E. | |
| 132. |
When WE= x it means that operation is |
| A. | running |
| B. | writing |
| C. | storing |
| D. | disabled |
| Answer» C. storing | |
| 133. |
For writing operation on memory |
| A. | ME=0 |
| B. | WE=0 |
| C. | ME=1 |
| D. | both a and b |
| Answer» E. | |
| 134. |
Write operation in memory is performed when WE is |
| A. | 1 |
| B. | 0 |
| C. | reset |
| D. | cleared |
| Answer» C. reset | |
| 135. |
For function simplification combined no is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 136. |
16x4 RAM indicates that each memory location is of |
| A. | 2bits |
| B. | 4bits |
| C. | 8bits |
| D. | 16bits |
| Answer» C. 8bits | |
| 137. |
3x8 decoder will have |
| A. | 3inputs |
| B. | 4inputs |
| C. | 5inputs |
| D. | 6inputs |
| Answer» B. 4inputs | |
| 138. |
Enable input of the shift register is called as |
| A. | load |
| B. | store |
| C. | reset |
| D. | strobe |
| Answer» E. | |
| 139. |
Shift register has Integrated circuit with number |
| A. | 74195 |
| B. | 74123 |
| C. | 74124 |
| D. | 74154 |
| Answer» B. 74123 | |
| 140. |
One operation that is not given by magnitude comparator |
| A. | equal |
| B. | less |
| C. | greater |
| D. | addition |
| Answer» E. | |
| 141. |
BCD to 7 segment is |
| A. | decoder |
| B. | encoder |
| C. | Multiplexer |
| D. | Demultiplexer |
| Answer» B. encoder | |
| 142. |
One that is a universal gate |
| A. | AND |
| B. | NAND |
| C. | OR |
| D. | NOT |
| Answer» C. OR | |
| 143. |
7 segment generates output |
| A. | a to b |
| B. | a to f |
| C. | a to g |
| D. | a to z |
| Answer» D. a to z | |
| 144. |
In the 14 pin gate pin number 7 is marked as |
| A. | Vcc |
| B. | Vdd |
| C. | ground |
| D. | AC |
| Answer» D. AC | |
| 145. |
Shift registers are used for |
| A. | shifting |
| B. | rotating |
| C. | adding |
| D. | both a and b |
| Answer» E. | |