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.
| 451. |
A full adder has two outputs SUM and CARRY. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 452. |
The resolution of 4 bit counting ADC is 0.5 volt, for an Analog input of 6.6 volts. The digital output of ADC will be |
| A. | 1011 |
| B. | 1101 |
| C. | 1100 |
| D. | 1110 |
| Answer» C. 1100 | |
| 453. |
The expression Y (A, B, C) = ∑m (1, 3, 5, 6) is to realized using a multiplexer. Then |
| A. | use 8 : 1 multiplexer and ground input lines 1, 3, 5, 6 |
| B. | use 8 : 1 multiplexer and ground input lines 0, 2, 4, 7 |
| C. | use 8 : 1 multiplexer and ground input lines 0, 1, 2, 3 |
| D. | use 8 : 1 multiplexer and ground input lines 4, 5, 6, 7 |
| Answer» C. use 8 : 1 multiplexer and ground input lines 0, 1, 2, 3 | |
| 454. |
Serial in-serial out shift register can be built using D flip flops. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 455. |
In the above case the hexadecimal notation for the last memory location is |
| A. | 0000 |
| B. | FFFF |
| C. | 3FFF |
| D. | 5FFF |
| Answer» C. 3FFF | |
| 456. |
FF₁₆ when converted to 8421BCD = |
| A. | 0000 0101 0101 |
| B. | 0010 0101 0101 |
| C. | 1111 0101 0101 |
| D. | 1000 0101 0101 |
| Answer» C. 1111 0101 0101 | |
| 457. |
Assertion (A): Divide-64 counter is a Mod-64 counter and divides the input frequency by 64 Reason (R): A Mod 64 counter can be obtained by cascading Mod 16 and Mod 4 counters. |
| 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 | |
| 458. |
Suppose a microprocessor has memory locations from 0000 to 3FFF, each storing I byte. How many bytes the memory can storing I bytes the memory can store? |
| A. | 4384 |
| B. | 8644 |
| C. | 12688 |
| D. | 16384 |
| Answer» C. 12688 | |
| 459. |
An SR flip flop can be built using |
| A. | NOR gate only |
| B. | NAND gate only |
| C. | either NOR or NAND gates |
| D. | neither NOR nor NAND gates |
| Answer» D. neither NOR nor NAND gates | |
| 460. |
Adder is a combinational logic circuit. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 461. |
Program counter in a digital computer |
| A. | counts the number of programs run in the machine |
| B. | counts the number of times a subroutine |
| C. | counts the number of time the loops are executed |
| D. | points the memory address of the current or the next instruction |
| Answer» E. | |
| 462. |
In a positive edge triggered D flip flop |
| A. | D input is called direct set |
| B. | Preset is called direct reset |
| C. | Present and clear are called direct set and reset respectively |
| D. | D input overrides other inputs |
| Answer» D. D input overrides other inputs | |
| 463. |
Flag bits in arithmetic unit provide |
| A. | status type information |
| B. | repeatability |
| C. | facilities for rechecks |
| D. | all of the above |
| Answer» B. repeatability | |
| 464. |
The 8085 microprocessor is interrupted while executing MOV instruction at location 0210 H. What is the location at which contents of register D are stored |
| A. | 054 CH |
| B. | 054 DH |
| C. | 054 EH |
| D. | 054 FH |
| Answer» E. | |
| 465. |
Which one of the following is a D to A conversion technique? |
| A. | Successive approximation |
| B. | Weighted resistor |
| C. | Dual slope |
| D. | Single slope |
| Answer» C. Dual slope | |
| 466. |
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. | |
| 467. |
Binary multiplication 1 x 0 = |
| A. | 1 |
| B. | 0 |
| C. | 10 |
| D. | 11 |
| Answer» C. 10 | |
| 468. |
In 8085 microprocessor, which of the following interrupts is unmaskable interrupts? |
| A. | RST 5.5 |
| B. | RST 7.5 |
| C. | TRAP |
| D. | INTR |
| Answer» D. INTR | |
| 469. |
In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is |
| A. | 2 and 7 |
| B. | 3 and 7 |
| C. | 1 and 6 |
| D. | 3 and 6 |
| Answer» B. 3 and 7 | |
| 470. |
CMOS is extensively used in |
| A. | pocket calculators |
| B. | digital wrist watches |
| C. | satellites |
| D. | all of the above |
| Answer» E. | |
| 471. |
The decimal equivalent of the hexadecimal number E 5 is |
| A. | 279 |
| B. | 229 |
| C. | 327 |
| D. | 0 |
| Answer» C. 327 | |
| 472. |
An 8 bit data is to be entered into a parallel in register. The number of clock pulses required is |
| A. | 8 |
| B. | 4 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 473. |
Assertion (A): The use of 2's complement has simplified the computer hardware for arithmetic operations Reason (R): 2's complement is obtained by adding 1 to 1's complement. |
| 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 | |
| 474. |
It is desired to display the digit 7 using a seven segment display. The LEDs to be turned on are |
| A. | a, b, c |
| B. | b, c, d |
| C. | c, d, e |
| D. | a, b, d |
| Answer» B. b, c, d | |
| 475. |
The op amp is used in |
| A. | A/D converters |
| B. | D/A converters |
| C. | both (a) and (b) |
| D. | shift registers |
| Answer» D. shift registers | |
| 476. |
The characteristic equation of flip-flop gives the next state QN + 1 in terms of present state QN and the inputs. Which one of the following is the characteristic equation of J - K flip-flop? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 477. |
For a NAND SR latch of input is the normal resting state of inputs is |
| A. | S = R = 1 |
| B. | S = 0, R = 1 |
| C. | S = 1, R = 0 |
| D. | S = R = 0 |
| Answer» B. S = 0, R = 1 | |
| 478. |
0.1011₂ = __________ . |
| A. | 0.6875₁₀ |
| B. | 0.6800₁₀ |
| C. | 0.0100₁₀ |
| D. | 0.5000₁₀ |
| Answer» B. 0.6800₁₀ | |
| 479. |
The density of the dynamic RAM is |
| A. | more than that of static RAM |
| B. | less than that of static RAM |
| C. | equal to that to static RAM |
| D. | equal to or more than that of static RAM |
| Answer» B. less than that of static RAM | |
| 480. |
How many zone bits are there?The 8156 of a figure has RAM locations from 2000 H to 20 FFH. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» D. 16 | |
| 481. |
The function Y = A B̅ C̅ + AB C̅ + A B̅ C + A̅ BC is to be realized using discrete gates. The inputs available are A, B, C. We need a total of |
| A. | 8 gates |
| B. | 6 gates |
| C. | 10 gates |
| D. | 5 gates |
| Answer» B. 6 gates | |
| 482. |
Which of the following statements defines a full adder? |
| A. | It adds two binary digits and produces their SUM and CARRY |
| B. | It adds three inputs (two binary digits and a carry) and produces their SUM and CARRY |
| C. | It has two inputs and two outputs |
| D. | None of the above |
| Answer» C. It has two inputs and two outputs | |
| 483. |
When a TTL is driving an CMOS gates it is necessary to ensure that |
| A. | VOL(for TTL) ≤ VIL (for CMOS) and V0H (for TTL) ≥ VIH (for CMOS) |
| B. | V0L (for TTL) ≥ VIL (for CMOS) |
| C. | V0H (for TTL) ≤ VIH (for CMOS) |
| D. | V0L (for TTL) ≥ VIL (for CMOS) and V0H (for TTL) ≤ VIH (for CMOS) |
| Answer» B. V0L (for TTL) ≥ VIL (for CMOS) | |
| 484. |
A 16-megabit dynamic random access memory (DRAM) is an integrated circuit capable of storing __________ characters (bytes). |
| A. | 1048567 |
| B. | 16 x 1024 x 10⁶ |
| C. | 16 x 10⁶ |
| D. | 2.1 x 10⁶ |
| Answer» E. | |
| 485. |
For the design of a sequential circuit having 9 states, minimum number of memory elements required is |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 9 |
| Answer» C. 5 | |
| 486. |
Given two numbers A and B in sign magnitude representation in an eight bit format A = 00011110 and B = 10011100 then A Ꚛ B gives |
| A. | 10000010 |
| B. | 00011111 |
| C. | 10011101 |
| D. | 11100001 |
| Answer» B. 00011111 | |
| 487. |
The contents of the program counter after the call operation point to the first instruction on the |
| A. | stack |
| B. | subroutine |
| C. | either of the above |
| D. | none of the above |
| Answer» C. either of the above | |
| 488. |
In flip flops the duration of clock pulse is about |
| A. | 3 ns |
| B. | 10 ns |
| C. | 25 ns |
| D. | 50 ns |
| Answer» B. 10 ns | |
| 489. |
When signed numbers are used in binary arithmetic, which of the following has unique representation for zero? |
| A. | Sign-magnitude |
| B. | 1's complement |
| C. | 2's complement |
| D. | 9's complement |
| Answer» D. 9's complement | |
| 490. |
Four memory chips of 16 x 4 size have their address buses connected together. This system will be of size |
| A. | 64 x 4 |
| B. | 16 x 16 |
| C. | 32 x 8 |
| D. | 256 x 1 |
| Answer» C. 32 x 8 | |
| 491. |
Typical size of digital IC is about |
| A. | 1″ x 1″ |
| B. | 2″ x 2″ |
| C. | 0.1″ x 0.1″ |
| D. | 0.001″ x 0.001″ |
| Answer» D. 0.001″ x 0.001″ | |
| 492. |
The power dissipated per gate |
| A. | is constant at all frequencies |
| B. | increases with frequency |
| C. | decreases with frequency |
| D. | may increase or decrease with frequency |
| Answer» C. decreases with frequency | |
| 493. |
The logical expression Y = A + A̅B is equivalent to |
| A. | Y = AB |
| B. | Y = A̅B |
| C. | Y = A̅ + B |
| D. | Y = A + B |
| Answer» E. | |
| 494. |
Assertion (A): ECL is fast as compared to TTL.Reason (R): ECL dissipates less power than TTL. |
| 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» D. A is false, R is true | |
| 495. |
In a NAND SR latch S = R = 1. Then |
| A. | Q = 1, Q̅ = 0 |
| B. | Q = 0, Q̅ = 1 |
| C. | both Q and Q̅ will be same as before |
| D. | the latch will be set |
| Answer» D. the latch will be set | |
| 496. |
Which of the following memories normally has highest storage capacity? |
| A. | Magnetic disc |
| B. | Magnetic tape |
| C. | Semiconductor memory |
| D. | Core memory |
| Answer» B. Magnetic tape | |
| 497. |
10's complement of 16₁₀ is |
| A. | 83₁₀ |
| B. | 84₁₀ |
| C. | 38₁₀ |
| D. | 48₁₀ |
| Answer» C. 38₁₀ | |
| 498. |
One of the function of the SiO₂ layer in an IC is to |
| A. | act as a dielectric for capacitors |
| B. | prevent shorting of elements by interconnections |
| C. | from cathodes for diodes |
| D. | afford protection from the radiations |
| Answer» C. from cathodes for diodes | |
| 499. |
The dual of A + [B + (AC)] + D is |
| A. | A + [(B (A + C))] + D |
| B. | A [B + AC] D |
| C. | A + [B (A + C)] D |
| D. | A [B (A + C)] D |
| Answer» E. | |
| 500. |
The time needed by a TTL circuit to switch from 0 to 1 or 1 to 0 is about |
| A. | 10 μs |
| B. | 10 ns |
| C. | 100 μs |
| D. | 50 ns |
| Answer» C. 100 μs | |