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MCQOPTIONS
This section includes 1271 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1151. |
The initial contents of the 4 bit serial in parallel out right shift, shift register shown in figure is 0110. After three clock pulses are applied, the contents of the shift register will be |
| A. | 0 |
| B. | 101 |
| C. | 1010 |
| D. | 1111 |
| Answer» D. 1111 | |
| 1152. |
The output of a half adder is |
| A. | SUM |
| B. | CARRY |
| C. | SUM and CARRY |
| D. | none of the above |
| Answer» D. none of the above | |
| 1153. |
A clock signal coordinates the working of different flip flops. |
| A. | 1 |
| B. | |
| C. | a longer subroutine |
| D. | a shorter subroutine |
| Answer» B. | |
| 1154. |
The boolean expression for shaded area in the given figure is |
| A. | AB + AC |
| B. | ABC + ABC |
| C. | ABC + ABC |
| D. | None of these |
| Answer» D. None of these | |
| 1155. |
TTL XOR gate is very suitable as LCO driver. |
| A. | 1 |
| B. | |
| C. | 65.536 memory |
| D. | 65.536 K memory |
| Answer» C. 65.536 memory | |
| 1156. |
Each term in POS form is called max terms. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1157. |
The modulus of counter in the given figure is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 1158. |
In a programmable counter |
| A. | the starting number for counting can be programmed |
| B. | the modulus can be programmed |
| C. | both the starting number and modulus can be programmed |
| D. | either the starting number or modulus can be programmed |
| Answer» C. both the starting number and modulus can be programmed | |
| 1159. |
Karnaugh map is used to |
| A. | minimise the number of flip flops in a digital circuit |
| B. | minimise the number of gates only in a digital circuit |
| C. | minimise the number of gates and fan in a digital circuit |
| D. | design gates |
| Answer» C. minimise the number of gates and fan in a digital circuit | |
| 1160. |
In 8085, TRAP is |
| A. | always maskable |
| B. | cannot interrupt a service subroutine |
| C. | used for catastrophic events like temporary power failure |
| D. | lowest priority interrupt |
| Answer» D. lowest priority interrupt | |
| 1161. |
In a JK master slave flip flop race condition does not occur. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1162. |
The hexadecimal number 64 AC is equivalent to decimal number |
| A. | 25727 |
| B. | 25722 |
| C. | 25772 |
| D. | 25777 |
| Answer» D. 25777 | |
| 1163. |
The fixed count that should be used so that the output register will represent the input for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000). |
| A. | 110 |
| B. | 10 |
| C. | 1111 |
| D. | 11101 |
| Answer» B. 10 | |
| 1164. |
A three state switch has three outputs. These are |
| A. | low, low and high |
| B. | low, high, high |
| C. | low. floating, low |
| D. | low, high, floating |
| Answer» E. | |
| 1165. |
A 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity then resolution in percent and volts. |
| A. | 3% 7 V |
| B. | 6.4 V, 2% |
| C. | 0.1%, 1.57 V |
| D. | 1.57%, 0.1 V |
| Answer» E. | |
| 1166. |
Data can be changed from spatial code to temporal code and vice-versa by using |
| A. | ADC and DAC |
| B. | shift Register |
| C. | synchronous counter |
| D. | timers |
| Answer» C. synchronous counter | |
| 1167. |
A master slave flip-flop has the characteristics that |
| A. | change in the I/P immediately reflected in the O/P |
| B. | change in the O/P occurs when the state of the master is affected |
| C. | change in the output occurs when the state of the slave is affected |
| D. | both the master and the slave states are affected at the same time |
| Answer» D. both the master and the slave states are affected at the same time | |
| 1168. |
A 1 ms pulse can be converted into a 10 ms pulse by using which one of the following |
| A. | An astable multivibrator |
| B. | Stable multivibrator |
| C. | A bistable multivibrator |
| D. | A J-K flip-flop |
| Answer» C. A bistable multivibrator | |
| 1169. |
The total number of fundamental products of three variables is |
| A. | 3 |
| B. | 5 |
| C. | 8 |
| D. | 16 |
| Answer» D. 16 | |
| 1170. |
The simplified logic expression for the circuit of the given figure is |
| A. | Y = A |
| B. | Y = AB |
| C. | Y = A + B |
| D. | Y + A + B |
| Answer» B. Y = AB | |
| 1171. |
In the figure, the LED |
| A. | emits light when both S1 and S2 are closed |
| B. | emits light when both S1 and S2 are open |
| C. | emits light when only S1 and S2 is closed |
| D. | does not Emit light, irrespective of the switched positions |
| Answer» E. | |
| 1172. |
A full adder can be made out of |
| A. | two half adders |
| B. | two half adders and a OR gate |
| C. | two half adders and a NOT gate |
| D. | three half adders |
| Answer» C. two half adders and a NOT gate | |
| 1173. |
A 4 bit binary adder has 4 full adders. |
| A. | 1 |
| B. | |
| C. | 10 bit |
| D. | 9 bit |
| Answer» C. 10 bit | |
| 1174. |
The output impedance of a logic pulser is |
| A. | low |
| B. | high |
| C. | may be Low or High |
| D. | can't say |
| Answer» B. high | |
| 1175. |
TTL is used in electronic calculators. |
| A. | 1 |
| B. | |
| C. | 10 |
| D. | 20 |
| Answer» C. 10 | |
| 1176. |
The complement of exclusive OR function is |
| A. | AB + A B |
| B. | AB + A B |
| C. | A B + A |
| D. | AB + A B |
| Answer» C. A B + A | |
| 1177. |
In a 7 segment display, LEDs b and c lit up. The decimal number displayed is |
| A. | 9 |
| B. | 7 |
| C. | 3 |
| D. | 1 |
| Answer» E. | |
| 1178. |
A decade counter skips |
| A. | binary states 1000 to 1111 |
| B. | binary states 0000 to 0011 |
| C. | binary states 1010 to 1111 |
| D. | binary states 1111 to higher |
| Answer» D. binary states 1111 to higher | |
| 1179. |
Assertion (A): An SR latch has the problem of RAC conditionReason (R): While designing a digital circuit RAC condition should be avoided. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 1180. |
What will be output for decimal input 82? |
| A. | 0.82 V |
| B. | 8 V |
| C. | 0.1 V |
| D. | 10 mV |
| Answer» B. 8 V | |
| 1181. |
A Schottky diode has |
| A. | no minority carriers and very low voltage drop in forward direction |
| B. | no minority carriers and very high voltage drop in forward direction |
| C. | large number of minority carriers and very high voltage drop in forward direction |
| D. | large number of minority carriers and very low voltage drop in forward direction |
| Answer» B. no minority carriers and very high voltage drop in forward direction | |
| 1182. |
Which type of gate is in the given figure? |
| A. | NOR |
| B. | OR |
| C. | NAND |
| D. | EX-OR |
| Answer» E. | |
| 1183. |
A16 X 216 __________ . |
| A. | 1616 |
| B. | 1516 |
| C. | 1416 |
| D. | 1316 |
| Answer» D. 1316 | |
| 1184. |
Consider the following registers: A accumulator and B registerB and C registersD and E registersH and L registers Which of these 8-bit registers of 8085 μP can be paired together to make a 16-bit register? |
| A. | 1, 3 and 4 |
| B. | 2, 3 and 4 |
| C. | 1 and 2 |
| D. | 1, 2 and 3 |
| Answer» C. 1 and 2 | |
| 1185. |
A TTL circuit with totem pole output has |
| A. | high output impedance |
| B. | low output impedance |
| C. | very high output impedance |
| D. | none of the above |
| Answer» C. very high output impedance | |
| 1186. |
The content of which of the following determines the state of the CPU at the end of the execute cycle (when the interrupt is recognized)? Program counterProcessor registerCertain status conditions Select the correct answer using the codes given below : |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 1187. |
What does the B register contain after the first MOV B, A has been executed? |
| A. | 40 H |
| B. | 60 H |
| C. | 80 H |
| D. | 80 D |
| Answer» B. 60 H | |
| 1188. |
Decimal number 46 in excess 3 code = |
| A. | 1000 1001 |
| B. | 0111 1001 |
| C. | 0111 1111 |
| D. | 1000 1111 |
| Answer» C. 0111 1111 | |
| 1189. |
The internal structure of PL A is similar to |
| A. | RAM |
| B. | ROM |
| C. | both RAM and ROM |
| D. | neither RAM nor ROM |
| Answer» E. | |
| 1190. |
The Boolean expression (A + B) (A + C) (B + C) simplifies to |
| A. | (A + B) C |
| B. | (A + B) C |
| C. | (A + B) C |
| D. | none of these |
| Answer» D. none of these | |
| 1191. |
An 8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If input is 10000000 the range of outputs is |
| A. | 994 to 1014 μA |
| B. | 990 to 1020 μA |
| C. | 800 to 1200 μA |
| D. | none of the above |
| Answer» B. 990 to 1020 ŒºA | |
| 1192. |
The problem of current lagging is associated with |
| A. | DCTL gates |
| B. | DTL gates |
| C. | ECL gates |
| D. | CMOS gates |
| Answer» B. DTL gates | |
| 1193. |
Which of the following characteristic are necessary for a sequential circuit? It must have 6 gatesIt must have feedbackIts output should depend on past value Which of the above statements are correct? |
| A. | 1, 2, 3 |
| B. | 1, 2 |
| C. | 2, 3 |
| D. | 1, 3 |
| Answer» D. 1, 3 | |
| 1194. |
A 3 bit binary adder can add |
| A. | 2 bits |
| B. | 2 bits |
| C. | 3 bits |
| D. | 8 bits |
| Answer» D. 8 bits | |
| 1195. |
A carry look ahead adder is frequently used for addition because |
| A. | it costs less |
| B. | it is faster |
| C. | it is more accurate |
| D. | is uses fewer gates |
| Answer» C. it is more accurate | |
| 1196. |
As applied to a flip flop the word edge triggered's means |
| A. | flip flop can change state when clock transition occurs |
| B. | flip flop can change state when clock signal goes from LOW to HIGH only |
| C. | flip flop can change state when clock signal goes from HIGH to LOW only |
| D. | none of the above |
| Answer» B. flip flop can change state when clock signal goes from LOW to HIGH only | |
| 1197. |
10's complement of 1610 is |
| A. | 8310 |
| B. | 8410 |
| C. | 3810 |
| D. | 4810 |
| Answer» C. 3810 | |
| 1198. |
Which of the following circuits can be used as parallel-to-series converter? |
| A. | Digital counter |
| B. | Decoder |
| C. | Demultiplexer |
| D. | Multiplexer |
| Answer» E. | |
| 1199. |
Equipment using BCD numbers |
| A. | pocket calculators |
| B. | electronic counter |
| C. | digital voltmeters |
| D. | all of the above |
| Answer» E. | |
| 1200. |
The circuit of the given figure is |
| A. | full adder |
| B. | full subtractor |
| C. | shift register |
| D. | decade counter |
| Answer» C. shift register | |