MCQOPTIONS
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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4551. |
Which device changes parallel data to serial data? |
| A. | Decoder |
| B. | Multiplexer |
| C. | Demultiplexer |
| D. | Flip flop |
| Answer» C. Demultiplexer | |
| 4552. |
A 12 bit ADC is employed to convert an analog voltage of zero to 10 volts. The resolution of the ADC is |
| A. | 2.44 mV |
| B. | 24.4 mV |
| C. | 83.3 mV |
| D. | 1.2 V |
| Answer» B. 24.4 mV | |
| 4553. |
D FF can be used as a |
| A. | differentiator |
| B. | divider circuit |
| C. | delay switch |
| D. | none |
| Answer» D. none | |
| 4554. |
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 | |
| 4555. |
Which of the following is decimal equivalent of the binary 1111111? |
| A. | 27 |
| B. | 87 |
| C. | 127 |
| D. | 167 |
| Answer» D. 167 | |
| 4556. |
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 | |
| 4557. |
Race condition always arises in |
| A. | synchronous circuit |
| B. | asynchronous circuit |
| C. | combinational circuit |
| D. | digital circuit |
| Answer» C. combinational circuit | |
| 4558. |
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 | |
| 4559. |
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 | |
| 4560. |
The number of flip flops required to construct a register to store number 10210 in binary form is |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 10 |
| Answer» E. | |
| 4561. |
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 | |
| 4562. |
Minimum no. of 2 I/P NAND gate required to implement the Boolean function Z = ABC, assuming that A, B and C are available is |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 4563. |
The process of entering data into ROM is called |
| A. | writing |
| B. | burning |
| C. | decoding |
| D. | registering |
| Answer» C. decoding | |
| 4564. |
The 8086 arithmetic instruction work on signed and unsigned numbersASCII dataunpacked BCD data Select the correct answer using the codes given below : |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 4565. |
NAND and NOR gates are universal gates. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4566. |
Floating gate is fabricated for making MOS |
| A. | ROM |
| B. | PROM |
| C. | EPROM |
| D. | EAROM |
| Answer» D. EAROM | |
| 4567. |
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 | |
| 4568. |
The main advantage of CMOS circuit is |
| A. | high gain |
| B. | high output impedance |
| C. | low power consumption |
| D. | high gain and high output impedance |
| Answer» D. high gain and high output impedance | |
| 4569. |
A 12-bit binary counter has the following state. The octal number represented is |
| A. | 677 |
| B. | 7163 |
| C. | 7128 |
| D. | 7183 |
| Answer» C. 7128 | |
| 4570. |
The control logic for a binary multiplier is specified by a states diagram. The state diagram has four states and two inputs. To implement it by the sequence register and decoder method. |
| A. | two flip-flop & 2 x 4 decoder are needed |
| B. | four flip-flop & 2 x 4 decoder are needed |
| C. | two flip-flop & 3 x 9 decoder are needed |
| D. | four flip-flop & 3 x 9 decoder are needed |
| Answer» B. four flip-flop & 2 x 4 decoder are needed | |
| 4571. |
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 | |
| 4572. |
An instruction used to set the carry flag in a computer can be classified as |
| A. | data transfer |
| B. | arithmetic |
| C. | Logical |
| D. | program control |
| Answer» D. program control | |
| 4573. |
In the assembler, which one of the following is required for variable name in symbol table? |
| A. | Addresses |
| B. | Values |
| C. | Registers |
| D. | Storage |
| Answer» D. Storage | |
| 4574. |
A monostable multivibrator has |
| A. | no stable state |
| B. | one stable state |
| C. | two stable state |
| D. | none of the above |
| Answer» C. two stable state | |
| 4575. |
Which memory does not require programming equipment? |
| A. | RAM |
| B. | EPROM |
| C. | EEPROM |
| D. | UVPROM |
| Answer» B. EPROM | |
| 4576. |
The binary number 0.10110111101 is equal to hexadecimal number |
| A. | B3A |
| B. | B5A |
| C. | B7A |
| D. | BA7 |
| Answer» D. BA7 | |
| 4577. |
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. | |
| 4578. |
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. | |
| 4579. |
The inputs to logic gate are 0. The output is 1. The gate is |
| A. | NAND or XOR |
| B. | OR or XOR |
| C. | AND or XOR |
| D. | NOR or Ex-NOR |
| Answer» E. | |
| 4580. |
In a JK master slave flip flop race condition does not occur. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4581. |
Consider the following statements: Race around condition can occur in JK flip flop when both inputs are 1A flip flop is used to store one bit of informationA transparent latch is a D type flip flopMaster slave flip flop is used to store two bits of information Which of the above are correct? |
| A. | 1, 2, 3 |
| B. | 1, 3, 4 |
| C. | 1, 2, 4 |
| D. | 2, 3, 4 |
| Answer» E. | |
| 4582. |
State transition table and state transition diagram form part of design steps for |
| A. | combinational circuits |
| B. | sequential circuits |
| C. | delay circuits |
| D. | all of the above |
| Answer» C. delay circuits | |
| 4583. |
Which binary subtraction is incorrect? |
| A. | 100101 - 100011 = 000000 |
| B. | 10000000 - 01000000 = 1000000 |
| C. | 10111110.1 - 101011.11 = 110010.11 |
| D. | 11111111 - 1111111 = 10000000 |
| Answer» B. 10000000 - 01000000 = 1000000 | |
| 4584. |
The counter which require maximum number of FF for a given mod counter is |
| A. | Ripple counter |
| B. | BCD counter |
| C. | Ring counter |
| D. | Programmed counter |
| Answer» D. Programmed counter | |
| 4585. |
Four inputs A, B, C, D are fed to a NOR gate. The output of NOR gate is fed to an inverter. The output of inverter is |
| A. | A + B + C + D |
| B. | <span style="text-decoration:overline;">A + B + C + D</span> |
| C. | ABCD |
| D. | <span style="text-decoration:overline;">ABCD</span> |
| Answer» B. <span style="text-decoration:overline;">A + B + C + D</span> | |
| 4586. |
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 | |
| 4587. |
In a gate output is Low if and only if all inputs are High. The gate is |
| A. | OR |
| B. | AND |
| C. | NOR |
| D. | NAND |
| Answer» E. | |
| 4588. |
A 4 bit ripple counter uses flip flops with propagation delay of 50 ns each. The maximum clock frequency which can be used is |
| A. | 5 MHz |
| B. | 10 MHz |
| C. | 20 MHz |
| D. | 25 MHz |
| Answer» B. 10 MHz | |
| 4589. |
An AND gate has two inputs A and B and one inhibit input S. Out of total 8 input states, output is 1 in |
| A. | 1 state |
| B. | 2 states |
| C. | 3 states |
| D. | 4 states |
| Answer» B. 2 states | |
| 4590. |
A multiple emitter transistor has many emitters and collectors. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4591. |
A mode-10 counter can divide the clock frequency by a factor of |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10000 |
| Answer» B. 100 | |
| 4592. |
Which of the following binary numbers is equivalent to decimal 10? |
| A. | 1000 |
| B. | 1100 |
| C. | 1010 |
| D. | 1001 |
| Answer» D. 1001 | |
| 4593. |
Assertion (A): Master slave JK flip flop is commonly used in high speed synchronous circuitry Reason (R): Master slave JK flip flop uses two JK flip flops in cascade. |
| 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» E. | |
| 4594. |
A counter has 4 flip flops. It divides the input frequency by |
| A. | 4 |
| B. | 2 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 4595. |
A 4 bit synchronous counter has flip flops having propagation delay of 50 ns each and AND gates having propagation delay of 20 ns each. The maximum frequency of clock pulses can be |
| A. | 20 MHz |
| B. | 50 MHz |
| C. | 14.3 MHz |
| D. | 5 MHz |
| Answer» D. 5 MHz | |
| 4596. |
Read the following statements The circuitry of ripple counter is more complex than that of synchronous counter.The maximum frequency of operation of ripple counter depends on the modulus of the counter.The maximum frequency of operation of synchronous counter does not depend on the modulus of the counter. Which of the above statements are correct? |
| A. | 1 only |
| B. | 1, 2 |
| C. | 1, 2, 3 |
| D. | 2, 3 |
| Answer» E. | |
| 4597. |
The logic circuit of the given figure is equivalent to |
| A. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/31-428-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/32-428-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/32-428-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/32-428-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/32-428-4.png"> | |
| 4598. |
Inputs A and B of the given figure are applied to a NAND gate. The output is LOW |
| A. | from 0 to 6 |
| B. | from 0 to 2 |
| C. | from 0 to 1 and 2 to 3 |
| D. | from 1 to 2 and 3 to 4 |
| Answer» D. from 1 to 2 and 3 to 4 | |
| 4599. |
ECL is a saturating logic. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4600. |
An SR flip flop can be built using NOR gates or NAND gates. |
| A. | True |
| B. | False |
| Answer» B. False | |