MCQOPTIONS
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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.
| 551. |
If all bubbles are removed, what are the new RAM locations?The 8156 of a figure has RAM locations from 2000 H to 20 FFH. |
| A. | (8000)H - (83FF)H |
| B. | (80AA)H - (80FF)H |
| C. | (FF00)H - (FFFF)H |
| D. | none of the above |
| Answer» D. none of the above | |
| 552. |
A compiler is a software programme which |
| A. | change high level Programming language into low level machine language |
| B. | change the program into binary form |
| C. | assembles the program |
| D. | executes the program |
| Answer» B. change the program into binary form | |
| 553. |
The Boolean function A + BC is reduced form of |
| A. | AB + BC |
| B. | AB + ABC |
| C. | (A + B) (A + C) |
| D. | (A + C)B |
| Answer» D. (A + C)B | |
| 554. |
The binary addition 1 + 1 = |
| A. | 11 |
| B. | 10 |
| C. | 111 |
| D. | 100 |
| Answer» C. 111 | |
| 555. |
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 | |
| 556. |
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 | |
| 557. |
T- FF used as a |
| A. | transfer Data switch |
| B. | toggle switch |
| C. | time delay switch |
| D. | none |
| Answer» C. time delay switch | |
| 558. |
Decimal number 9 in gray code = |
| A. | 1100 |
| B. | 1101 |
| C. | 110 |
| D. | 1111 |
| Answer» C. 110 | |
| 559. |
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 | |
| 560. |
Out of multiplexer and demultiplexer, which can be used as a logic function generator? |
| A. | Multiplexer only |
| B. | Demultiplexer only |
| C. | Both |
| D. | None |
| Answer» B. Demultiplexer only | |
| 561. |
With 2's complement representation, the range of values that can be represented on the data bus of an 8 bit microprocessor is given by |
| A. | -128 to 127 |
| B. | -128 to +128 |
| C. | -127 to 128 |
| D. | -256 to 256 |
| Answer» B. -128 to +128 | |
| 562. |
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 | |
| 563. |
Binary 1000 will be the result of which of the following? |
| A. | Binary 1000 - 100 |
| B. | Binary 1011 - 1111 |
| C. | Binary 1111 - 111 |
| D. | Binary 11111 - 1111 |
| Answer» D. Binary 11111 - 1111 | |
| 564. |
A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires |
| A. | 8 half adders and 4 OR gates |
| B. | 8 half adders and 3 OR gates |
| C. | 7 half adders and 3 OR gates |
| D. | 7 half adders and 4 OR gates |
| Answer» D. 7 half adders and 4 OR gates | |
| 565. |
RAMs can be built with bipolar or CMOS transistor RAMs that are not possible with bipolar transistors are |
| A. | SRAM |
| B. | SRAM, DRAM |
| C. | DRAM |
| D. | PROM |
| Answer» D. PROM | |
| 566. |
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 | |
| 567. |
In floating point number 0110100000010101, the exponent is equal to __________ 10 |
| A. | 11 |
| B. | -11 |
| C. | 10 |
| D. | -10 |
| Answer» C. 10 | |
| 568. |
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 | |
| 569. |
__________ switch, a T flip-flop is used as __________ switch, a T flip-flop is used as switch |
| A. | toggled, delay |
| B. | delay, toggle |
| C. | set reset |
| D. | reset, set |
| Answer» C. set reset | |
| 570. |
Assertion (A): The access time of memory is lowest in the case of DRAM Reason (R): DRAM uses refreshing cycle. |
| 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. | |
| 571. |
In a 7 segment LED display, the minimum number of segments is activated when the input decimal number is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 572. |
The multiplication time for 10-bit numbers with 1 MHz clock will be |
| A. | 32 μ sec |
| B. | 20 μ sec |
| C. | 21 μ sec |
| D. | 22 μ sec |
| Answer» E. | |
| 573. |
The maximum counting range of a four stage counter using IC 74193 is |
| A. | 0 to 1023 |
| B. | 0 to 4093 |
| C. | 0 to 65535 |
| D. | 0 to 131071 |
| Answer» D. 0 to 131071 | |
| 574. |
Given two numbers A and B in sign magnitude representation in an eight bit format A = 00011110 and B = 10011100 then A ‚äï B gives |
| A. | 10000010 |
| B. | 11111 |
| C. | 10011101 |
| D. | 11100001 |
| Answer» B. 11111 | |
| 575. |
Mark the false statement: |
| A. | since wave-shape of a digital signal is unimportant, linear amplifiers are not required |
| B. | the precise amplitude of a digital signal is also unimportant provided two voltage levels (0 and 1) are quite different |
| C. | the leading and trailing edges of a digital signal need not be sharp |
| D. | actual digital waves have rise and fall times of the order of a few nano seconds |
| Answer» D. actual digital waves have rise and fall times of the order of a few nano seconds | |
| 576. |
In a shift left register, shifting a bit by one bit means |
| A. | division by 2 |
| B. | multiplication by 2 |
| C. | subtraction of 2 |
| D. | None of the above |
| Answer» C. subtraction of 2 | |
| 577. |
If 4 in binary system is 100 then 8 will be |
| A. | 10 |
| B. | 100 |
| C. | 111 |
| D. | 1000 |
| Answer» E. | |
| 578. |
In the given figure shows a logic circuit. The minimum Boolean expression for this circuit is |
| A. | A + B |
| B. | A + B + C |
| C. | AB + C |
| D. | AB + AC + BC |
| Answer» C. AB + C | |
| 579. |
A 10 MHz square wave clocks 5 bit ripple counter. The frequency of the 3rd FF output is |
| A. | 2 MHz |
| B. | 1.25 MHz |
| C. | 50 MHz |
| D. | 615 kHz |
| Answer» C. 50 MHz | |
| 580. |
For the shaded area in Venn diagram of the given figure, the Boolean expression is |
| A. | AB + BC + CA |
| B. | ABC + A B C |
| C. | ABC + A B C |
| D. | ABC+AB |
| Answer» B. ABC + A B C | |
| 581. |
For a D/A converter, inputs and outputs are given. The output corresponding to digital input 01000 |
| A. | 2.0 V |
| B. | 2.5 V |
| C. | 3.0 V |
| D. | 4.0 V |
| Answer» B. 2.5 V | |
| 582. |
What will be conversion time of a successive approximation A/D converter which uses 2 MHz clock and 5 bit binary ladder containing 8 V reference.? |
| A. | 2.5 μ sec |
| B. | 25 μ sec |
| C. | 3 μ sec |
| D. | 4 μ sec |
| Answer» B. 25 Œº sec | |
| 583. |
How many interrupts are there of 8085 μP? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 584. |
The number of flip flops needed for a Mod 7 counter are |
| A. | 7 |
| B. | 5 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 585. |
Start and stop bit do not contain any information but are used in serial communication for |
| A. | error correction |
| B. | error detection |
| C. | synchronization |
| D. | slowing down the communication |
| Answer» D. slowing down the communication | |
| 586. |
In 8085 microprocessor, what is the length of A-register? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» C. 12 bits | |
| 587. |
In a 4 bit parallel in parallel out shift register A = 1, B = 1, C = 0, D = 1. The data output after 3 clock pulses is |
| A. | 1101 |
| B. | 1001 |
| C. | 101 |
| D. | 1 |
| Answer» B. 1001 | |
| 588. |
A 4 bit transistor register has output voltage of high-low-high-low. The binary number stored and its decimal equivalent are |
| A. | 0101 and 5 |
| B. | 0101 and 10 |
| C. | 1010 and 5 |
| D. | 1010 and 10 |
| Answer» E. | |
| 589. |
Decimal 1932 when converted into 10's complement will become |
| A. | 8868 |
| B. | 8060 |
| C. | 8608 |
| D. | 8806 |
| Answer» C. 8608 | |
| 590. |
For K map of the given figure the simplified Boolean expression is |
| A. | Y = A B C + A B C + A B C |
| B. | Y = A C + B |
| C. | Y = A B C + ABC |
| D. | Y = A B C + AB C + ABC |
| Answer» C. Y = A B C + ABC | |
| 591. |
Which of the- following display consumes least amount of power? |
| A. | LCD |
| B. | LED |
| C. | Fluorescent display |
| D. | All display consume same power |
| Answer» B. LED | |
| 592. |
What will be BCD number when the output is 0.37 V? |
| A. | 110111 |
| B. | 10110111 |
| C. | 11001000 |
| D. | 1001000 |
| Answer» B. 10110111 | |
| 593. |
The inputs to a 3 bit binary adder are 1112 and 1102. The output will be |
| A. | 101 |
| B. | 1101 |
| C. | 1111 |
| D. | 1110 |
| Answer» C. 1111 | |
| 594. |
In 8085 microprocessor, what is the memory address stored on the stack, when the program is interrupted? |
| A. | 0210 H |
| B. | 0.211 H |
| C. | 0118 H |
| D. | 020 FH |
| Answer» C. 0118 H | |
| 595. |
BCD numbers are useful whenever |
| A. | binary to hexadecimal conversion is desired |
| B. | binary to BCD conversion is desired |
| C. | decimal information is transferred into or out of a digital system |
| D. | none of the above |
| Answer» D. none of the above | |
| 596. |
Three Mod-16 counters are connected in cascade. The maximum counting range is |
| A. | 16 |
| B. | 256 |
| C. | 4096 |
| D. | none of the above |
| Answer» D. none of the above | |
| 597. |
In N channel MOSFET with gate reverse biased, the gate current is of the order |
| A. | 10-3 amp |
| B. | 10-6 amp |
| C. | 10-9 amp |
| D. | 10-12 amp |
| Answer» E. | |
| 598. |
The contents of stack location 2109 H after the call operation will be |
| A. | 1111 |
| B. | 1010101 |
| C. | 100000 |
| D. | 100010 |
| Answer» D. 100010 | |
| 599. |
The binary sum of 1110102 and 110112 is |
| A. | 10101012 |
| B. | 10110012 |
| C. | 10111012 |
| D. | 11111112 |
| Answer» B. 10110012 | |
| 600. |
Advanced low power Schottky is a part of |
| A. | ECL family |
| B. | CMOS family |
| C. | TTL family |
| D. | none of the above |
| Answer» D. none of the above | |