MCQOPTIONS
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MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The dual of the function A(B̅C + BC + BC̅) is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 152. |
TTL XOR gate is very suitable as LCO driver. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 153. |
A 4 : 1 multiplexer requires __________ data select line. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 154. |
What kind of signal does the times produce? |
| A. | Single pulse |
| B. | Square wave |
| C. | Continuous pulse |
| D. | No signal |
| Answer» B. Square wave | |
| 155. |
In 8156, the lower times byte is addressed with 24 H, and the upper times byte with |
| A. | 20 H |
| B. | 23 H |
| C. | 24 H |
| D. | 25 H |
| Answer» E. | |
| 156. |
AB + AB̅ = |
| A. | B |
| B. | A |
| C. | 1 |
| D. | 0 |
| Answer» C. 1 | |
| 157. |
A decade counter |
| A. | counts for ten days |
| B. | counts ten times faster than a binary counters |
| C. | counts to 9 and reset on the next pulse |
| D. | reverts on the pulse after the tenth |
| Answer» D. reverts on the pulse after the tenth | |
| 158. |
Figure shows three pulse train inputs to a 3-input AND gate. Assuming positive logic, the output signal obtained in figure would be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 159. |
The difference between sequential and combinational circuits is |
| A. | Combinational circuits store bits |
| B. | Combinational circuits have memory |
| C. | Sequential circuits store bits |
| D. | Sequential circuits have memory |
| Answer» E. | |
| 160. |
The complement of Boolean expression AB (B̅ C + AC) is |
| A. | (A̅ + B̅) + (B + C̅) + (A̅ + C̅) |
| B. | A̅ B̅ + (B + C̅)(A̅ + C̅) |
| C. | (A̅ + B̅) + (B + C̅) (A̅ + C̅) |
| D. | none of the above |
| Answer» D. none of the above | |
| 161. |
Current requirement of a piezo buffer is about |
| A. | 100mA |
| B. | 20mA |
| C. | 4mA |
| D. | 0.4mA |
| Answer» D. 0.4mA | |
| 162. |
The gate width of a monostable multivibrator is given by |
| A. | T = 1.1 RC |
| B. | T = 0.693 RC |
| C. | 0.963 RC |
| D. | T = 0.369 RC |
| Answer» C. 0.963 RC | |
| 163. |
Which of the following is non-saturating? |
| A. | TTL |
| B. | CMOS |
| C. | ECL |
| D. | Both (a) and (b) |
| Answer» D. Both (a) and (b) | |
| 164. |
A 3 input NAND gate is to be used as inverter. Which of the following will give better results? |
| A. | The two unused inputs are left open |
| B. | The two unused inputs are connected to 0 |
| C. | The two unused inputs are connected to 1 |
| D. | None of the above |
| Answer» D. None of the above | |
| 165. |
Which of the following is best suited for parity checking and parity generation? |
| A. | AND, OR, NOT gates |
| B. | XOR, Exclusive NOR gate |
| C. | NAND gates |
| D. | NOR gates |
| Answer» C. NAND gates | |
| 166. |
In 8085 microprocessor, how many lines are there in address bus? |
| A. | 6 |
| B. | 8 |
| C. | 12 |
| D. | 16 |
| Answer» E. | |
| 167. |
A 16 x 8 ROM stores these words in its first four locations, as given below. Which of this represents 3 CH in hexadecimal? |
| A. | R0 = 1110 0010 |
| B. | R1 = 0101 0111 |
| C. | R2 = 0011 1100 |
| D. | R3 = 1011 1111 |
| Answer» D. R3 = 1011 1111 | |
| 168. |
Computers use thousands of flip-flops. To coordinate the overall action, a common signal is sent to all flip-flop known as |
| A. | debug signal |
| B. | toggle signal |
| C. | active signal |
| D. | clock signal |
| Answer» E. | |
| 169. |
Four MSI TTL 4-bit ripple counters are cascaded to form a 16-bit binary counter. Its propagation delay is about __________ nanoseconds. |
| A. | 70 |
| B. | 140 |
| C. | 210 |
| D. | 280 |
| Answer» E. | |
| 170. |
Assertion (A): In a magnitude comparator IC the cascading inputs provide a means to cascade the 4 bit comparators Reason (R): A magnitude comparator has three outputs, A = B, A > B and A < B |
| 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 | |
| 171. |
The minterm designation for ABCD is |
| A. | m₈ |
| B. | m₁₀ |
| C. | m₁₄ |
| D. | m₁₅ |
| Answer» E. | |
| 172. |
Out of the following memory types, one that is volatile is |
| A. | ferrite-core |
| B. | semiconductor RAM |
| C. | semiconductor ROM |
| D. | magnetic disc |
| Answer» C. semiconductor ROM | |
| 173. |
Consider the following statements in connection with CMOS inverter in figure where both the MOSFET are of enhancement type and both have a threshold voltage of 2 Vstatements 1: T1 conducts when vi ≥ 2 Vstatements 2: T1 is always in saturation when v0 = 0 VWhich of the following is correct? |
| A. | Only statement 1 is true |
| B. | Only statement 2 is true |
| C. | Both the statement are true |
| D. | Both the statements are false |
| Answer» B. Only statement 2 is true | |
| 174. |
Find the output voltage for 011100 in a 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V. |
| A. | 6.4 V |
| B. | 2.84 V |
| C. | 0.1 V |
| D. | 8 V |
| Answer» C. 0.1 V | |
| 175. |
In floating point representation, mantissa is expressed in |
| A. | excess 3 notation |
| B. | gray code |
| C. | excess 32 notation |
| D. | 2's complement |
| Answer» D. 2's complement | |
| 176. |
A half adder can be used only for adding |
| A. | 1 s |
| B. | 2 s |
| C. | 4 s |
| D. | 8 s |
| Answer» B. 2 s | |
| 177. |
A seven bit (even parity) code 0010001 may have error. The correct code is |
| A. | 0010001 |
| B. | 1110001 |
| C. | 0011001 |
| D. | 1111110 |
| Answer» D. 1111110 | |
| 178. |
Which display device resembles vacuum tube? |
| A. | LED |
| B. | LCD |
| C. | VF |
| D. | None of these |
| Answer» D. None of these | |
| 179. |
Assertion (A): CMOS devices have very low power consumption Reason (R): CMOS devices have high noise margin. |
| 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 | |
| 180. |
In figure, R = 20KΩ and C = 75 pF. The converter clock frequency will be |
| A. | 606 Hz |
| B. | 1212 Hz |
| C. | 555 KHz |
| D. | 606 KHz |
| Answer» B. 1212 Hz | |
| 181. |
Minimum number of 2-input NAND gates required to implement the function F = (x̅ + y̅) (Z + W) is |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 182. |
In which function is each term known as maxterm? |
| A. | SOP |
| B. | POS |
| C. | Hybrid |
| D. | SOP and Hybrid |
| Answer» C. Hybrid | |
| 183. |
In register index addressing mode the effective address is given by |
| A. | index register value |
| B. | sum of the index register value and the operand |
| C. | operand |
| D. | difference of the index register value and the operand |
| Answer» C. operand | |
| 184. |
The inputs to a 4 channel MUX have the following bandwidths. Channel 1-50 Hz, channel 2-200 Hz. Channel 3-75 Hz. Channel 4-90 Hz. The theoretical minimum sampling rate of the MUX is |
| A. | 200 Hz |
| B. | 400 Hz |
| C. | 415 Hz |
| D. | 1600 Hz |
| Answer» E. | |
| 185. |
Some ADCs are 1. Parallel2. Updown3. Single slope4. Dual slope5. Successive approximation6. Stair step Out of above which ones do not use DAC? |
| A. | 1 only |
| B. | 1, 3, 4 |
| C. | 1, 2, 3 |
| D. | 1, 5, 6 |
| Answer» C. 1, 2, 3 | |
| 186. |
Out of 5 M x 8, 1 M x 16, 2 M x 16 and 3M x 8 memories, which memory can store more bits? |
| A. | 5 M x 8 |
| B. | 2 M x 16 |
| C. | 3 M x 8 |
| D. | 1 M x 16 |
| Answer» B. 2 M x 16 | |
| 187. |
The number of LED display indicators in logic probe are |
| A. | 1 |
| B. | 2 |
| C. | 1 or 2 |
| D. | 4 |
| Answer» C. 1 or 2 | |
| 188. |
The characteristic equation for the next state (Qn+1) of a J-K flip-flop is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 189. |
Both OR and AND gates can have only two inputs. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 190. |
In a three input AND gate A = 1, B = 1, C = 0 The output Y = |
| A. | ABC |
| B. | A̅BC |
| C. | ABC̅ |
| D. | AB̅C |
| Answer» D. AB̅C | |
| 191. |
Decimal 18.29 when converted int 10's complement will become |
| A. | 81.7707 |
| B. | 81.700 |
| C. | 81.777 |
| D. | 81.077 |
| Answer» B. 81.700 | |
| 192. |
A counter has 4 flip flops. It divides the input frequency by |
| A. | 4 |
| B. | 2 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 193. |
TTL inverter has |
| A. | one input |
| B. | two inputs |
| C. | one or two inputs |
| D. | three inputs |
| Answer» C. one or two inputs | |
| 194. |
Which of the following circuits can be used as parallel-to-series converter? |
| A. | Digital counter |
| B. | Decoder |
| C. | Demultiplexer |
| D. | Multiplexer |
| Answer» E. | |
| 195. |
Assertion (A): The TTL output acts as a current sink in low state Reason (R): The TTL input current is largest in low state. |
| 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 | |
| 196. |
In a shift register the data is loaded in one operation but shifted out one bit at a time, The shift register is |
| A. | serial in-serial out |
| B. | parallel in-serial out |
| C. | serial in-parallel out |
| D. | parallel in-parallel out |
| Answer» C. serial in-parallel out | |
| 197. |
Shifting digits from left to right and vice versa is needed in |
| A. | storing numbers |
| B. | arithmetic operations |
| C. | counting |
| D. | storing and counting |
| Answer» C. counting | |
| 198. |
The clear data and present input of the JK flip-flop are known as |
| A. | direct inputs |
| B. | synchronous inputs |
| C. | indirect inputs |
| D. | either direct inputs or synchronous inputs |
| Answer» E. | |
| 199. |
The function of interface circuit is |
| A. | to match output conditions of driver with input conditions of load device |
| B. | to match output conditions of load device with input conditions of driver |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» B. to match output conditions of load device with input conditions of driver | |
| 200. |
A retriggerable one shot is one which |
| A. | can be triggered only once |
| B. | has two quasi stable states |
| C. | can not be retriggered till the complete pulse appears at output |
| D. | can be retriggered while the output is being generated |
| Answer» E. | |