MCQOPTIONS
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MCQOPTIONS
This section includes 289 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Identify the IC that can be used for frequency division by 5? |
| A. | 7492 |
| B. | 7490 |
| C. | 7121 |
| D. | 7446 |
| Answer» C. 7121 | |
| 152. |
Fan out for the 74 series is |
| A. | 4 |
| B. | 5 |
| C. | 10 |
| D. | 12 |
| Answer» D. 12 | |
| 153. |
An IC that is a 4-bit latch is |
| A. | 7446 |
| B. | 7400 |
| C. | 7410 |
| D. | 7475 |
| Answer» E. | |
| 154. |
For making two-input EX OR gate the number of 7400 needed is |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 8 |
| Answer» B. 3 | |
| 155. |
Which of the following devices need low power consumption? |
| A. | Pocket calculators |
| B. | Digital wrist watches |
| C. | Digital instrument display |
| D. | All of the above |
| Answer» E. | |
| 156. |
The first microprocessor made available commercially in 1971 was a |
| A. | 2 bit device in 10-pin package |
| B. | 4 bit device in 18 pin package |
| C. | 8 bit device in 24 pin package |
| D. | 16 bit device in 36 pin package |
| Answer» C. 8 bit device in 24 pin package | |
| 157. |
Medium scale integration (MSI) has |
| A. | 12 to 20 gates per chip |
| B. | 12 to 100 gates per chip |
| C. | 20 to 1000 gates per chip |
| D. | 30 to 10,000 gates per chip |
| Answer» C. 20 to 1000 gates per chip | |
| 158. |
Small scale integration, abbreviated SSI, refers to fewer than |
| A. | 24 gates on the same chip |
| B. | 16 gates on the same chip |
| C. | 12 gates on the same chip |
| D. | 4 gates on the same chip |
| Answer» D. 4 gates on the same chip | |
| 159. |
In the circuit shown in Fig. the value of input P goes from 0 1 and that of Q goes from 1 0. |
| A. | Output (a) |
| B. | Output (b) |
| C. | Output (c) |
| D. | Output (d) |
| Answer» E. | |
| 160. |
In the above case |
| A. | 1 |
| B. | 0 |
| C. | 1 or 0 |
| D. | None of these |
| Answer» C. 1 or 0 | |
| 161. |
Which of the following sign magnitude number is equivalent to decimal + 49? |
| A. | 0001 1110 |
| B. | 1000 0111 |
| C. | 1001 1100 |
| D. | 0011 0001 |
| Answer» E. | |
| 162. |
Which sum of the following 8 bit numbers is equivalent to hexadecimal 2AH? |
| A. | 0001 0000 and 0000 1000 |
| B. | 0001 1000 and 0000 1100 |
| C. | 0001 1100 and 0000 1110 |
| D. | 0010 1000 and 0011 1011 |
| Answer» D. 0010 1000 and 0011 1011 | |
| 163. |
A NAND gate has an OFF output |
| A. | When all of its inputs are off |
| B. | When one of its inputs is off |
| C. | Only when all of its inputs are ON |
| D. | None of the above |
| Answer» D. None of the above | |
| 164. |
An 8-bit microprocessor uses 2's complement representations. The decimal number 48 will be represented as |
| A. | 1001 1001 |
| B. | 1110 1110 |
| C. | 1111 1111 |
| D. | 1101 0000 |
| Answer» E. | |
| 165. |
(X+Y) ( |
| A. | XYX |
| B. | X+Y+Z |
| C. | XY = YZ + ZX |
| D. | 0 |
| Answer» E. | |
| 166. |
An 8-bit microprocessor uses 2's complement representation. The decimal number + 37 will appear as |
| A. | 0010 0111 |
| B. | 0101 1001 |
| C. | 1001 1001 |
| D. | 0010 0101 |
| Answer» E. | |
| 167. |
Which of the following 2's complement when expressed in hexadecimal form, is equivalent to F9H? |
| A. | 0000 0111 |
| B. | 1111 1111 |
| C. | 1111 1101 |
| D. | 1110 0001 |
| Answer» B. 1111 1111 | |
| 168. |
CMOS are widely used |
| A. | In LSI |
| B. | LSI and MSI |
| C. | Where low power consumption is needed |
| D. | More reliability is a major consideration |
| Answer» D. More reliability is a major consideration | |
| 169. |
The two basic technologies for digital ICs are bipolar and MOS. Bipolar technology is preferred for |
| A. | LSI only |
| B. | LSI and MSI |
| C. | MSI and SSI |
| D. | LSI, MSI and SSI |
| Answer» D. LSI, MSI and SSI | |
| 170. |
Byte is synonymous with |
| A. | Character |
| B. | Word |
| C. | Number |
| D. | Band |
| Answer» B. Word | |
| 171. |
Which of the following microprocessor was first to be commercially manufactured? |
| A. | Honeywell 200 |
| B. | Intel 8080 |
| C. | PDP 8 |
| D. | Intel 4004 |
| Answer» E. | |
| 172. |
Which of the following is the widely used bipolar? |
| A. | DTL |
| B. | TTL |
| C. | ECL |
| D. | None of these |
| Answer» C. ECL | |
| 173. |
MOS technology is more suited to LSI because |
| A. | More MOSFETs can be fabricated on the same chip area |
| B. | LSI are more reliable |
| C. | LSI have longer life |
| D. | SSI is cheaper. |
| Answer» B. LSI are more reliable | |
| 174. |
An 8-bit microprocessor uses 2's complement representation. How will the decimal number 19 appear? |
| A. | 1110 1101 EDH |
| B. | 1111 1111 DEA |
| C. | 1101 0000 DOH |
| D. | 1101 1111 DAH |
| Answer» B. 1111 1111 DEA | |
| 175. |
A multiplexer has |
| A. | One input and one output |
| B. | One input and many outputs |
| C. | Many inputs and one output |
| D. | Many inputs and many outputs. |
| Answer» D. Many inputs and many outputs. | |
| 176. |
Which of the following TTL has become the favourite of digital designers? |
| A. | High speed TTL |
| B. | Low power TTL |
| C. | Low power Schottky TTL |
| D. | All of the above |
| Answer» D. All of the above | |
| 177. |
An 8-bit microprocessor uses 2's complement representation. How will the decimal number 41 appear? |
| A. | 1101 1010 DOE |
| B. | 1101 1001 DEA |
| C. | 1101 0000 DOH |
| D. | 1101 1111 DAH |
| Answer» D. 1101 1111 DAH | |
| 178. |
2's complement of 1110 0001 expressed in hexadecimal form will be |
| A. | 2 BC |
| B. | 3 EF |
| C. | 2 GG |
| D. | 1 FH |
| Answer» E. | |
| 179. |
In fig. the outputs are cross-coupled back to the inputs of the NOR gates. If A = 0 and B = 1, Y will be |
| A. | 1 |
| B. | 0 |
| C. | 1 or 0 |
| D. | None of these |
| Answer» B. 0 | |
| 180. |
For the circuit shown below the counter state (Q |
| A. | 00, 01, 10, 11, 00 .......... |
| B. | 00, 01, 10, 00, 01 .......... |
| C. | 00, 01, 11, 00, 01 .......... |
| D. | 00, 10, 11, 00, 10 .......... |
| Answer» C. 00, 01, 11, 00, 01 .......... | |
| 181. |
Consider a multiplexer with X and Y as data inputs and Z as control input, Z = 0 selects input X and Z = 1 selects input Y. What are the connections required to realize the 2-variable Boolean function f = T + R, without using, any additional hardware? |
| A. | R to X, 1 to Y, T to Z |
| B. | R to X, R to Y, T to Z |
| C. | R to X, R to Y, 0 to Z |
| D. | R to X, 0 to Y, T to Z |
| Answer» B. R to X, R to Y, T to Z | |
| 182. |
Which of the following Boolean expressions correctly represents the relation between P, Q, R and M? |
| A. | M = (P OR Q)XOR R |
| B. | M = (P AND Q)XOR R |
| C. | M = (P NOR Q)XOR R |
| D. | M = (P XOR Q)XOR R |
| Answer» E. | |
| 183. |
The octal equivalent of the HEX number AB. CD is |
| A. | 253.314 |
| B. | 253.632 |
| C. | 526.314 |
| D. | 526.632 |
| Answer» C. 526.314 | |
| 184. |
What is the minimum number of NAND gates required to implement A + A |
| A. | 0 |
| B. | 1 |
| C. | 4 |
| D. | 7 |
| Answer» B. 1 | |
| 185. |
Consider the following logic circuit. What is the required input condition (A, B, C) to make the output X = 1? |
| A. | (1, 0, 1) |
| B. | (0, 0, 1) |
| C. | (1, 1, 1) |
| D. | (0, 1, 1) |
| Answer» E. | |
| 186. |
Which one of the following statement is correct? For a 4- input NOR gate, when only two inputs are to be used, the best option for the used input is to |
| A. | Connect them to the ground |
| B. | Connect them to V |
| C. | <sub>cc</sub> |
| D. | Keep them open |
| E. | Connect them to the used inputs |
| Answer» B. Connect them to V | |
| 187. |
Minimum no. of NAND gates require to implement the logic Y = |
| A. | 0 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 188. |
When signed numbers are used in binary arithmetic, then which one of the following notations would have unique representation for zero? |
| A. | Sign magnitude |
| B. | 1's complement |
| C. | 2's complement |
| D. | 9's complement |
| Answer» D. 9's complement | |
| 189. |
In the figure, as long as X |
| A. | At 1 |
| B. | At 0 |
| C. | At its initial value |
| D. | Unstable |
| Answer» E. | |
| 190. |
A digital circuit which compares two numbers A |
| A. | 1010, 1010 |
| B. | 0101, 0101 |
| C. | 0010, 0010 |
| D. | 1010, 1011 |
| Answer» E. | |
| 191. |
In an all NOR gate realization of a combinational circuit all EVEN and ODD level gate behaves like |
| A. | OR and AND |
| B. | AND and OR |
| C. | OR and NOT |
| D. | NOR and AND |
| Answer» C. OR and NOT | |
| 192. |
The main drawback of digital system is that |
| A. | It is difficult to design |
| B. | It is not a precise system |
| C. | The real world is mainly analog |
| D. | Digital circuits are prone to noise |
| Answer» D. Digital circuits are prone to noise | |
| 193. |
Examine the conditions indicated in figure and find out the faulty gate |
| A. | (2), (3), (4) |
| B. | (2), (3), (5) |
| C. | (2), (4), (5) |
| D. | (2), (5), (6) |
| Answer» C. (2), (4), (5) | |
| 194. |
In which of the following case, the value of Y will be 0? |
| A. | PQRS = 0011 |
| B. | PQRS = 0110 |
| C. | PQRS = 1001 |
| D. | All of these |
| Answer» B. PQRS = 0110 | |
| 195. |
Find the output of given circuit |
| A. | AB + C |
| B. | AB |
| C. | A + BC |
| D. | AC + B |
| Answer» E. | |
| 196. |
Determine the values of A, B, C that makes the sum term |
| A. | A = 1, B = 0, C = 0 |
| B. | A = 1, B = 1, C = 0 |
| C. | A = 0, B = 0, C = 1 |
| D. | All of them |
| Answer» D. All of them | |
| 197. |
The parity bit is added for.........purposes. |
| A. | Coding |
| B. | Indexing |
| C. | Error correction |
| D. | Controlling |
| Answer» D. Controlling | |
| 198. |
Which of the following are universal gates? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2, and 3 |
| Answer» B. 1 and 3 only | |
| 199. |
The parity of binary number 11001110 |
| A. | is even |
| B. | is not known |
| C. | is odd |
| D. | is as the number of zeros |
| Answer» D. is as the number of zeros | |
| 200. |
When representing in the following code, the consecutive decimal numbers differ only in one bit |
| A. | Excess - 3 |
| B. | Gray |
| C. | BCD |
| D. | Hexadecimal |
| Answer» C. BCD | |