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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.
| 3551. |
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. | |
| 3552. |
In the CMOS inverter |
| A. | one transistor is N channel and the other P channel |
| B. | one is enhancement type and other depletion type |
| C. | both are N channel with one enhancement and the other depletion type |
| D. | none |
| Answer» C. both are N channel with one enhancement and the other depletion type | |
| 3553. |
Which one of the following is used to change data from spatial code to temporal code? |
| A. | Shift register |
| B. | Counter |
| C. | A/D converters |
| D. | Combinational circuits |
| Answer» B. Counter | |
| 3554. |
Which of the following needs DC forward voltage to emit light? |
| A. | LED |
| B. | LCD |
| C. | Both LED as well as LCD |
| D. | None of the above |
| Answer» B. LCD | |
| 3555. |
If a microcomputer has a 64 K memory; what is the hexadecimal notations for the last memory location? |
| A. | 1111 |
| B. | 1A1A |
| C. | EEEF |
| D. | FFFF |
| Answer» E. | |
| 3556. |
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 | |
| 3557. |
A depletion type NMOS is operated in enhancement mode. Vp = - 4 volts. For VGS = + 3 volts as VDS is increased, ID becomes nearly constant when Vps equals |
| A. | 1 volt |
| B. | 3 volts |
| C. | 4 volt |
| D. | 7 volts |
| Answer» E. | |
| 3558. |
Which one of the following is D/A conversion technique? |
| A. | Successive approximation |
| B. | Weighted resistor |
| C. | Dual slope |
| D. | Single slope |
| Answer» C. Dual slope | |
| 3559. |
Assuming accumulator contain A 64 and the carry is set (1). What will accumulator (A) and carry (CY) contain after ANA A? |
| A. | A 6 H, 1 |
| B. | A 6 H, 0 |
| C. | 00 H, 0 |
| D. | 00 H, 1 |
| Answer» C. 00 H, 0 | |
| 3560. |
A number is expressed in binary 2's complement as 10011 decimal equivalent value is |
| A. | 19 |
| B. | 13 |
| C. | -19 |
| D. | -13 |
| Answer» E. | |
| 3561. |
In INHIBIT operation |
| A. | output is 1 when both inputs are 0 |
| B. | output is 0 when blocking input is 1 |
| C. | output is 0 when blocking input is 0 |
| D. | output is 1 when blocking input is either 0 or 1 |
| Answer» C. output is 0 when blocking input is 0 | |
| 3562. |
The product of which of the following gives the figure of merit of a logic family? |
| A. | Gain and bandwidth |
| B. | Propagation delay time and power dissipation |
| C. | Fan-out and propagation delay time |
| D. | Noise margin and power dissipation |
| Answer» C. Fan-out and propagation delay time | |
| 3563. |
A JK flip flop can be converted to D flip flop by |
| A. | Connecting both J and K terminals to D |
| B. | Connecting J terminal to D and leaving K open |
| C. | Connecting K terminal to D and leaving J open |
| D. | Connecting J terminal to D and K terminal to D through an inverter |
| Answer» E. | |
| 3564. |
The main advantage of hexadecimal numbers is |
| A. | ease of conversion from hexadecimal to binary and vice-versa |
| B. | ease of conversion from hexadecimal to decimal and vice-versa |
| C. | ease of conversion from gray code to binary and vice-versa |
| D. | the use of numbers and alphabets |
| Answer» B. ease of conversion from hexadecimal to decimal and vice-versa | |
| 3565. |
T- FF used as a |
| A. | transfer Data switch |
| B. | toggle switch |
| C. | time delay switch |
| D. | none |
| Answer» C. time delay switch | |
| 3566. |
A pulse train can be delayed by a finite number of clock periods by using |
| A. | serial in-serial out shift register |
| B. | parallel in serial out shift register |
| C. | serial in-parallel out shift register |
| D. | parallel in parallel out shift register |
| Answer» B. parallel in serial out shift register | |
| 3567. |
The disadvantage of counter type ADC as compared to comparator ADC is that |
| A. | resolution is low |
| B. | conversion time is more |
| C. | circuit is more complex |
| D. | stability is low |
| Answer» B. conversion time is more | |
| 3568. |
In 8421 Binary coded Decimal system the decimal number 237 is represented by |
| A. | 1000110111 |
| B. | 1000111110 |
| C. | 001000110111 |
| D. | 10010010011 |
| Answer» D. 10010010011 | |
| 3569. |
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 | |
| 3570. |
39.1210 = __________ 10 |
| A. | 10111.0001111 |
| B. | 100011.0001111 |
| C. | 100001.0001111 |
| D. | 001111.0001111 |
| Answer» B. 100011.0001111 | |
| 3571. |
Which of the following is the least important consideration while selecting a logic technology? |
| A. | Power dissipation |
| B. | Noise immunity |
| C. | Number of pins |
| D. | Cost |
| Answer» D. Cost | |
| 3572. |
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 | |
| 3573. |
Assertion (A): Power drain of CMOS increases with operating frequency Reason (R): All unused CMOS inputs should be tied either to a fixed voltage level (0 or VDD) or to another input. |
| 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 | |
| 3574. |
In two level logic, logic race does not occur. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3575. |
Large scale integration refers to |
| A. | more than 50 gates on the same chip |
| B. | more than 80 gates on the same chip |
| C. | more than 100 gates on the same chip |
| D. | none of the above |
| Answer» D. none of the above | |
| 3576. |
RAM can be expanded to |
| A. | increase word size |
| B. | increase word number |
| C. | either increase word size or increase word number |
| D. | none of the above |
| Answer» D. none of the above | |
| 3577. |
Which of the following statements is not true in regard to storage time of a diode? |
| A. | During this time, the diode is reverse-biased |
| B. | The diode conducts during this time |
| C. | It is due to the time taken by carriers to depart from the function when the diode is reverse-biased |
| D. | During this time the diode current is zero |
| Answer» E. | |
| 3578. |
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 | |
| 3579. |
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 | |
| 3580. |
Is Schottky TTL, Schottky diode is used primary to |
| A. | prevent saturation of the transistor |
| B. | saturate the transistor |
| C. | act as a switch |
| D. | act as a controlling switch |
| Answer» B. saturate the transistor | |
| 3581. |
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. | 0101 |
| D. | 0001 |
| Answer» B. 1001 | |
| 3582. |
The race condition in NOR SR latch occurs when |
| A. | S = R = 1 |
| B. | S = 0, R = 1 |
| C. | S = 0, R = 0 |
| D. | S = 1, R = 0 |
| Answer» B. S = 0, R = 1 | |
| 3583. |
Flag bits in arithmetic unit provide |
| A. | status type information |
| B. | repeatability |
| C. | facilities for rechecks |
| D. | all of the above |
| Answer» B. repeatability | |
| 3584. |
The generic microprocessor contains a zero and a carry flag. These are located on theThe 8156 of a figure has RAM locations from 2000 H to 20 FFH. |
| A. | interrupt control |
| B. | status register |
| C. | either (a) or (b) |
| D. | none of the above |
| Answer» C. either (a) or (b) | |
| 3585. |
How many interrupts are there of 8085 P? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 3586. |
Assertion (A): A 4 input variable logic circuit can be implemented using a 8 : 1 multiplexer.Reason (R): When a multiplexer is used as a logic function generator, the logic design is simple. |
| 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 | |
| 3587. |
A 6 MHz channel is used by a digital signalling system initializing four-level signals. The maximum possible transmission rate is |
| A. | 6M bands/s |
| B. | 12M bands/s |
| C. | 6 M bits/s |
| D. | 12M bits/s |
| Answer» B. 12M bands/s | |
| 3588. |
Recommended fanout for ECL is |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 25 |
| Answer» E. | |
| 3589. |
Race condition occurs in |
| A. | synchronous circuit |
| B. | asynchronous circuit |
| C. | combinational circuit |
| D. | all the Digital circuit |
| Answer» C. combinational circuit | |
| 3590. |
What does the B register contain after the first MOV B, A has been executed? |
| A. | 40 H |
| B. | 60 H |
| C. | 80 H |
| D. | 80 D |
| Answer» C. 80 H | |
| 3591. |
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is |
| A. | TTL |
| B. | CMOS |
| C. | ECL |
| D. | TTLLS |
| Answer» D. TTLLS | |
| 3592. |
Which of the following is a self-complementing code? |
| A. | 8421 code |
| B. | Excess 3 codes |
| C. | Pure binary code |
| D. | Gray code |
| Answer» E. | |
| 3593. |
ALU processes |
| A. | decimal numbers |
| B. | binary numbers |
| C. | hexadecimal numbers |
| D. | all of the above |
| Answer» C. hexadecimal numbers | |
| 3594. |
Assertion (A): TTL uses multiple emitter transistor.Reason (R): Multiple emitter transistors with about 60 emitters have been developed. |
| 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 | |
| 3595. |
An 8085 microprocessor based system uses a 4 k x 8 bit RAM whose address in AAOOH. The address of the last byte in this RAM is |
| A. | OFFFH |
| B. | 1000H |
| C. | B9FFH |
| D. | BA00H |
| Answer» E. | |
| 3596. |
Read the following statements: Dual slope ADC provides higher speed as compared to other ADCvery good accuracygood rejection of power supplybetter resolutions compared to other ADC for the same number of bits Which of the above are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1, 2, 3 |
| D. | 1, 2, 3, 4 |
| Answer» C. 1, 2, 3 | |
| 3597. |
In 8085 microprocessor, how many I/O ports can be accessed by memory mapped method? |
| A. | 8 |
| B. | 256 |
| C. | 32 K |
| D. | 64 K |
| Answer» D. 64 K | |
| 3598. |
The open wired circuit in the given figure works as a |
| A. | EX - NOR gate |
| B. | AND gate |
| C. | XOR gate |
| D. | NOR gate |
| Answer» D. NOR gate | |
| 3599. |
The circuit shown below is functionally equivalent to |
| A. | NOR gate |
| B. | OR gate |
| C. | EX-OR gate |
| D. | NAND gate |
| Answer» D. NAND gate | |
| 3600. |
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 | |