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.
| 351. |
The number of inputs and outputs of a full adder are |
| A. | 3 and 2 respectively |
| B. | 2 and 3 respectively |
| C. | 4 and 2 respectively |
| D. | 2 and 4 respectively |
| Answer» B. 2 and 3 respectively | |
| 352. |
The range of signed decimal number that can be represented by 6 bit in complement number is |
| A. | -31 to +31 |
| B. | -63 to +64 |
| C. | -64 to +63 |
| D. | -32 to +31 |
| Answer» B. -63 to +64 | |
| 353. |
11101₂ x 10001₂ = |
| A. | 111101101 |
| B. | 111101100 |
| C. | 11110 |
| D. | 1100110 |
| Answer» B. 111101100 | |
| 354. |
Assertion (A): The propagation delay in ECL is minimum Reason (R): Transistors used in ECL switch between active and cutoff regions. |
| 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» B. Both A and R are correct but R is not correct explanation of A | |
| 355. |
Single parity check is not reliable in case of |
| A. | paper tape |
| B. | magnetic tape |
| C. | magnetic drum |
| D. | cores |
| Answer» D. cores | |
| 356. |
E7F6₁₆ = __________ . |
| A. | 600000₁₀ |
| B. | 59382₁₀ |
| C. | 9382₁₀ |
| D. | 382₁₀ |
| Answer» C. 9382₁₀ | |
| 357. |
Is the interrupt-enable flag? |
| A. | Low |
| B. | High |
| C. | Never |
| D. | None |
| Answer» C. Never | |
| 358. |
Computer ICs work reliably because |
| A. | they are based on two state design |
| B. | these are made from pure silicon |
| C. | these are maintained at two temperatures |
| D. | none of the above |
| Answer» B. these are made from pure silicon | |
| 359. |
A gate in which shift register is connected as shown in the figure below. How many clock pulse (after reset to '0') the contents of the shift register are '000' again? |
| A. | 3 |
| B. | 6 |
| C. | 16 |
| D. | 8 |
| Answer» C. 16 | |
| 360. |
What is the direction of address bus? |
| A. | Unidirectional into μp |
| B. | Unidirection out of μp |
| C. | Bidirectional |
| D. | Mixed direction, i.e., some lines into up and some others out of μp |
| Answer» C. Bidirectional | |
| 361. |
A register is |
| A. | a group is memories |
| B. | a group of devices that store digital data |
| C. | a chip used in computers |
| D. | a pure silica piece used in digital systems |
| Answer» C. a chip used in computers | |
| 362. |
A 14 pin NOT gate 1C has __________ NOT gates. |
| A. | 8 |
| B. | 6 |
| C. | 5 |
| D. | 4 |
| Answer» C. 5 | |
| 363. |
(62)₁₀ in binary system is |
| A. | 110000 |
| B. | 111100 |
| C. | 111110 |
| D. | 111111 |
| Answer» D. 111111 | |
| 364. |
The problem of current lagging is associated with |
| A. | DCTL gates |
| B. | DTL gates |
| C. | ECL gates |
| D. | CMOS gates |
| Answer» B. DTL gates | |
| 365. |
A dynamic RAM cell which holds 5 V has to be refreshed every 20 ms so that the stored voltage does not fall by more than 0.5 V. If the cell has a constant discharge current of 0.1 pA, the storage capacitance of cell is |
| A. | 4 x 10‾⁶ F |
| B. | 4 x 10‾⁹ F |
| C. | 4 x 10‾¹² F |
| D. | 4 x 10‾¹⁵ F |
| Answer» E. | |
| 366. |
In the given figure shows a 3 bit shift register using TTL flip flops. Initially all the flip flops are set to 0 state. After 8 clock pulses |
| A. | A = 1, B = 1, C = 1 |
| B. | A = 1, B = 1, C = 0 |
| C. | A = 0, B = 1, C = 1 |
| D. | A = 0, B = 0, C = 1 |
| Answer» B. A = 1, B = 1, C = 0 | |
| 367. |
What will be minimum conversion rate in 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. | 9000 |
| B. | 9259 |
| C. | 1000 |
| D. | 1000 |
| Answer» C. 1000 | |
| 368. |
The number of comparator circuits required to build a three-bit simultaneous A/D converter is |
| A. | 7 |
| B. | 8 |
| C. | 15 |
| D. | 16 |
| Answer» B. 8 | |
| 369. |
In 8085 microprocessor, which of the following interrupts has the lowest priority? |
| A. | RST 5.5 |
| B. | RST 7.5 |
| C. | TRAP |
| D. | INTR |
| Answer» B. RST 7.5 | |
| 370. |
The circuit show in the figure has 4 boxes each described by inputs P, Q, R and outputs y, z withY = P Ꚛ Q Ꚛ R, Z = RQ + P̅R + QP̅. The circuit act as a |
| A. | 4 bit adder giving P + Q |
| B. | 4 bit subtractor P - Q |
| C. | 4 bit subtractor Q - P |
| D. | 4 bit adder P + Q + R |
| Answer» C. 4 bit subtractor Q - P | |
| 371. |
Full adder circuit can be implemented by |
| A. | Multiplexers |
| B. | Half adders |
| C. | AND or OR gates |
| D. | Decoders |
| Answer» B. Half adders | |
| 372. |
An n bit ADC using Vr as reference has a resolution (in volts) of |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 373. |
The number of digits in hexadecimal system |
| A. | 15 |
| B. | 16 |
| C. | 10 |
| D. | 8 |
| Answer» C. 10 | |
| 374. |
For AB + A̅C + BC = AB + A̅C the dual form is |
| A. | (A + B) (A̅ + C)(B + C) = (A + B)(A̅ + C) |
| B. | (A̅ + B ) (A + C̅)(B̅ + C̅) = (A̅ + B̅)(A + C̅) |
| C. | (A + B) (A + C) (B + C) = (A̅ + B̅) (A̅ + C) |
| D. | none of the above |
| Answer» B. (A̅ + B ) (A + C̅)(B̅ + C̅) = (A̅ + B̅)(A + C̅) | |
| 375. |
Which is known as flash converter? |
| A. | Weighted resistor D/A converter |
| B. | Parallel A/D converter |
| C. | Stair step A/D converter |
| D. | Up-down counter type A/D converter |
| Answer» C. Stair step A/D converter | |
| 376. |
Boolean algebra obeys |
| A. | commutative law |
| B. | associative law |
| C. | distributive law |
| D. | commutative, associative and distributive law |
| Answer» E. | |
| 377. |
What is the decimal equivalent of the binary number shown in fourth row? |
| A. | 79 |
| B. | 97 |
| C. | 117 |
| D. | 127 |
| Answer» C. 117 | |
| 378. |
Hexadecimal number F is called to octal number |
| A. | 15 |
| B. | 16 |
| C. | 17 |
| D. | 18 |
| Answer» D. 18 | |
| 379. |
Unlimited number of ICs 7490, 78492 and 7493 are available. Which of these could be used to build the dividse-by-60 circuit of figure |
| A. | 7490 |
| B. | 7492 |
| C. | combination of 7490 and 7492 |
| D. | combination of 7492 and 7493 |
| Answer» D. combination of 7492 and 7493 | |
| 380. |
Which of the following represents the decimal form of binary 0.0111? |
| A. | 0.1600 |
| B. | 0.22728 |
| C. | 0.9375 |
| D. | 0.7964 |
| Answer» D. 0.7964 | |
| 381. |
Decade counter has 4 flip flops and skips states 10 to 15. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 382. |
The values of 2⁵ in octal system is |
| A. | 40 |
| B. | 20 |
| C. | 400 |
| D. | 200 |
| Answer» B. 20 | |
| 383. |
An 8-bit microprocessor has 16 bit address bus A₀ - A₁₅. The processor addresses a 1-K byte memory chip as shown. The address range for the chip is |
| A. | (F00F)H TO (F40E)H |
| B. | (F000)H TO (F3FF)H |
| C. | (F100)H TO (F4FF)H |
| D. | (F700)H TO (FAFF)H |
| Answer» C. (F100)H TO (F4FF)H | |
| 384. |
Which one of the following is the correct sequence of the numbers represented in the series given below? |
| A. | 2, 3, 4, 5, 6...... |
| B. | 2, 4, 6, 8, 10 ..... |
| C. | 2, 4, 6, 10, 12...... |
| D. | 2, 4, 6, 10, 16 ..... |
| Answer» E. | |
| 385. |
Assertion (A): The advantages of totem pole output are fast switching and low power consumption.Reason (R): IC packages available are DIP, surface mount and J lead surface mount. |
| 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 | |
| 386. |
A 4 bit down counter can count from |
| A. | 0000 to 1111 |
| B. | 1111 to 0000 |
| C. | 000 to 111 |
| D. | 111 to 000 |
| Answer» C. 000 to 111 | |
| 387. |
Consider the following features: 1. negative operands cannot be used2. when immediate operand changes, the program should be reassembled3. the program is difficult to read4. the size of operand is restricted by word length of the computer Disadvantages of immediate addressing include |
| A. | 1 and 2 |
| B. | 2 and 4 |
| C. | 2 and 3 |
| D. | 1 and 4 |
| Answer» C. 2 and 3 | |
| 388. |
The output Y of the circuit shown in the figure is |
| A. | (A + B) C + DE |
| B. | AB + C(D + E) |
| C. | (A + B) C + D + E |
| D. | (AB + C) . DE |
| Answer» B. AB + C(D + E) | |
| 389. |
The communicating capacitor reduces turn on time because |
| A. | it acts as an open circuit |
| B. | it allows maximum base circuit to flow |
| C. | it aids in removing the excess carrier from the base region |
| D. | none of these |
| Answer» C. it aids in removing the excess carrier from the base region | |
| 390. |
In 8085, out of interrupts given below, one particular interrupts is quite different from others, This interrupt is |
| A. | RST 5.5 |
| B. | RST 6.5 |
| C. | RST 7.5 |
| D. | none of these |
| Answer» D. none of these | |
| 391. |
The binary number 0.10110111101 is equal to hexadecimal number |
| A. | B3A |
| B. | B5A |
| C. | B7A |
| D. | BA7 |
| Answer» D. BA7 | |
| 392. |
An I/O processor control the flow of information between |
| A. | cache memory and I/O devices |
| B. | main memory and I/O devices |
| C. | 1 Two I/O devices |
| D. | cache and main memories |
| Answer» C. 1 Two I/O devices | |
| 393. |
Each term in POS form is called max terms. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 394. |
DeMorgan's first theorem shows the equivalence of |
| A. | OR gate and Exclusive OR gate |
| B. | NOR gate and Bubbled AND gate |
| C. | NOR gate and NAND gate |
| D. | NAND gate and NOT gate |
| Answer» C. NOR gate and NAND gate | |
| 395. |
A hexadecimal odometer displays F52F. The next reading will be |
| A. | E 52 F |
| B. | E 52 E |
| C. | E 53 F |
| D. | F 53 O |
| Answer» E. | |
| 396. |
Y = A + A̅ B is the same as |
| A. | Y = AB |
| B. | Y = A + B |
| C. | Y = A̅ + B̅ |
| D. | Y = A̅ + B |
| Answer» C. Y = A̅ + B̅ | |
| 397. |
Which of the following statements is not true in regard to storage time of a transistor? |
| A. | The transistor is in active region |
| B. | Both junctions are forward-biased |
| C. | The collector injects electrons or holes into the base region |
| D. | It is the time taken by the carriers to leave the base region |
| Answer» B. Both junctions are forward-biased | |
| 398. |
Assertion (A): Gray code is used in shaft position encoding.Reason (R): In gray code only a single bit change occurs when going from one code to another. |
| 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» B. Both A and R are correct but R is not correct explanation of A | |
| 399. |
Which of them has 10 inputs and 4 outputs? |
| A. | Decimal to BCD encoder |
| B. | BCD to decimal decoder |
| C. | Octal to binary encoder |
| D. | All encoders |
| Answer» B. BCD to decimal decoder | |
| 400. |
Which of the following memory is preferred in case of calculators? |
| A. | Dynamic RAM |
| B. | Dynamic ROM |
| C. | Static ROM |
| D. | Static RAM |
| Answer» B. Dynamic ROM | |