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.
| 3601. |
The number of LED display indicators in logic probe are |
| A. | 1 |
| B. | 2 |
| C. | 1 or 2 |
| D. | 4 |
| Answer» C. 1 or 2 | |
| 3602. |
The time needed by a TTL circuit to switch from 0 to 1 or 1 to 0 is about |
| A. | 10 s |
| B. | 10 ns |
| C. | 100 s |
| D. | 50 ns |
| Answer» C. 100 s | |
| 3603. |
Assertion (A): R-2R ladder type DAC has higher speed of operation than weighted resistor DAC Reason (R): R-2R ladder type DAC uses only two different values of resistor network uses many different values of resistors |
| 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 | |
| 3604. |
Which of the following circuits can be used as parallel-to-series converter? |
| A. | Digital counter |
| B. | Decoder |
| C. | Demultiplexer |
| D. | Multiplexer |
| Answer» E. | |
| 3605. |
For an N bit ADC, the percentage resolution is [1/2N - 1)] 100. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3606. |
Commercial ECL gates use two ground lines and one negative supply to |
| A. | reduce power consumption |
| B. | increase fan out |
| C. | reduce loading effect |
| D. | eliminate the effect of power line glitches on the biasing circuit |
| Answer» E. | |
| 3607. |
Dynamic memory cells are constructed using |
| A. | FETs |
| B. | MOSFETs |
| C. | Transistors |
| D. | Flip flops |
| Answer» C. Transistors | |
| 3608. |
A 3 stage Johnson counter (ring) shown in figure is clocked at a constant frequency of fc from the starting state of Q0 Q1 Q2 = 101. The frequency of output Q0 Q1 Q2 will be |
| A. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/37-540-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/37-540-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/37-540-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/37-540-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/37-540-4.png"> | |
| 3609. |
If we need a low noise device, we should use |
| A. | BJT |
| B. | FET |
| C. | thyristor |
| D. | UJT |
| Answer» C. thyristor | |
| 3610. |
Which of the following bus is used to transfer data from main memory to peripheral device? |
| A. | DMA bus |
| B. | Output bus |
| C. | Input bus |
| D. | Data bus |
| Answer» B. Output bus | |
| 3611. |
The contents of the commands register are 23 H. Then port C |
| A. | is an input port |
| B. | is an output port |
| C. | is both input as well as output port |
| D. | none of the above |
| Answer» B. is an output port | |
| 3612. |
The principal of locality of reference justifies the use of |
| A. | interrupts |
| B. | DMA |
| C. | virtual memory |
| D. | cache memory |
| Answer» E. | |
| 3613. |
Which is correct with respect to computer memory? |
| A. | Only a particular address can have a particular memory |
| B. | Any address can have any memory |
| C. | To read a word from computer memory, it is not necessary to specify a location |
| D. | None of the above |
| Answer» C. To read a word from computer memory, it is not necessary to specify a location | |
| 3614. |
A 3 bit binary adder should use |
| A. | 3 full adders |
| B. | 2 full adders and 1 half adder |
| C. | 1 full adder and 2 half adders |
| D. | 3 half adders |
| Answer» C. 1 full adder and 2 half adders | |
| 3615. |
For a depletion type NMOS, Vp = - 4 volts. For VGS = 0, 1D = 16 mA in the pinch off region of VDS. For VGS = - 2, the value of ID in the pinch off region of VDS is given by |
| A. | 64 mA |
| B. | 32 mA |
| C. | 16 mA |
| D. | 4 mA |
| Answer» E. | |
| 3616. |
The two outputs of RS flip-flop are |
| A. | always low |
| B. | always high |
| C. | either low or high |
| D. | always complementary |
| Answer» E. | |
| 3617. |
A 3 bit binary adder can add |
| A. | 2 bits |
| B. | 2 bits |
| C. | 3 bits |
| D. | 8 bits |
| Answer» D. 8 bits | |
| 3618. |
The logic performed by the high-noise immunity logic circuit shown below is |
| A. | OR |
| B. | AND |
| C. | NOR |
| D. | NAND |
| Answer» E. | |
| 3619. |
An 8156 has A15 connected to its CE input. A14 to A8 are unconnected, and AD7 to AC0 are connected.Ignoring shadows, the port addresses |
| A. | 80 H |
| B. | 85 H |
| C. | 82 H, 83 H |
| D. | 80 H to 85 H |
| Answer» E. | |
| 3620. |
In 8085 microprocessor, what is the length of IR (instruction register)? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» C. 12 bits | |
| 3621. |
A sequence detector is required to give a logical output of 1 whenever the sequence 1011 is detected in the incoming pulse stream. Minimum number of flip-flops needed to built the sequence detector is |
| A. | 4 |
| B. | 3 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 3622. |
Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after ADI A4H? |
| A. | 4 AH, 0 |
| B. | 4 AH, 1 |
| C. | 4 BH, 0 |
| D. | 4 BH, 1 |
| Answer» C. 4 BH, 0 | |
| 3623. |
For wired AND connection we should use |
| A. | TTL gates with active pull up |
| B. | TTL gates with open collector |
| C. | TTL gates without active pull up and with open collector |
| D. | any of the above |
| Answer» D. any of the above | |
| 3624. |
In a monolithic IC, resistors are formed from |
| A. | ceramic material |
| B. | manganin wire |
| C. | P-type semiconductor |
| D. | aluminium ribbon |
| Answer» D. aluminium ribbon | |
| 3625. |
The resolution of a 12-bit D/A converter using a binary ladder with + 10V as the full scale output will be |
| A. | 2.44 mV |
| B. | 3.50 mV |
| C. | 4.32 mV |
| D. | 5.12 mV |
| Answer» B. 3.50 mV | |
| 3626. |
The sum of 11101012 and 110112 in decimal form will be |
| A. | 65 |
| B. | 75 |
| C. | 85 |
| D. | 95 |
| Answer» D. 95 | |
| 3627. |
Binary 1111 when added to binary 11111, the result in binary is |
| A. | 111111 |
| B. | 1111 |
| C. | 1000 |
| D. | 10000 |
| Answer» E. | |
| 3628. |
The widely used binary multiplication method is |
| A. | repeated addition |
| B. | add and shift |
| C. | shift and add |
| D. | any of the above |
| Answer» C. shift and add | |
| 3629. |
In the 2's complement Adder-Subtractor |
| A. | sign magnitude numbers represent negative numbers |
| B. | the sign magnitude numbers have "1" as leading bit |
| C. | the sign magnitude numbers have '0' as leading bit |
| D. | 2's complement represents positive numbers |
| Answer» D. 2's complement represents positive numbers | |
| 3630. |
Shifting digits from left to right and vice versa is needed in |
| A. | storing numbers |
| B. | arithmetic operations |
| C. | counting |
| D. | storing and counting |
| Answer» C. counting | |
| 3631. |
What is the length of SP (Stack pointer) of 8085 p? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» E. | |
| 3632. |
In the above case the hexadecimal notation for the last memory location is |
| A. | 0000 |
| B. | FFFF |
| C. | 3FFF |
| D. | 5FFF |
| Answer» C. 3FFF | |
| 3633. |
Current requirement of a piezo buffer is about |
| A. | 100mA |
| B. | 20mA |
| C. | 4mA |
| D. | 0.4mA |
| Answer» D. 0.4mA | |
| 3634. |
Consider the following instruction of 8085 p :MOV M, AAODCMVI A, FFCMP M Which of these cause change in the status of flag(s)? |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 3 and 4 |
| D. | 2 and 4 |
| Answer» E. | |
| 3635. |
In a shift register the data is loaded in one operation but shifted out one bit at a time, The shift register is |
| A. | serial in-serial out |
| B. | parallel in-serial out |
| C. | serial in-parallel out |
| D. | parallel in-parallel out |
| Answer» C. serial in-parallel out | |
| 3636. |
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 | |
| 3637. |
In CCD |
| A. | a small charge is deposited for logical 1 |
| B. | a small charge is deposited for both logical 1 and 0 |
| C. | a small charge is deposited for logical 0 and large charge for logical 1 |
| D. | none of the above |
| Answer» D. none of the above | |
| 3638. |
Dual slope ADC uses an op amp comparator. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3639. |
The output of the 74 series of TTL gates is taken from a BST in |
| A. | totem pole and common collector configuration |
| B. | either totem pole or open collector configuration |
| C. | common base configuration |
| D. | common collector configuration |
| Answer» C. common base configuration | |
| 3640. |
Assertion (A): Demorgan's first theorem replaces a NOR gate by bubbled AND gate.Reason (R): Double complement of a variable equals the variable. |
| 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 | |
| 3641. |
A flip-flop circuit is |
| A. | monostable |
| B. | bistable |
| C. | multistable |
| D. | unstable |
| Answer» C. multistable | |
| 3642. |
If the switch is thrown to the START position, Q and Y will be equal to |
| A. | Q = 0, Y = 0 |
| B. | Q= 1, Y= 1 |
| C. | Q = 1, Y = CLK |
| D. | Q = 0, Y = CLK |
| Answer» D. Q = 0, Y = CLK | |
| 3643. |
The hexadecimal number system is |
| A. | widely used in analyzing and programming microprocessors |
| B. | an obsolete system no more in use |
| C. | used in calculators only |
| D. | none of the above |
| Answer» B. an obsolete system no more in use | |
| 3644. |
The stack is a specialized temporary __________ access memory during __________ and __________ instructions.The 8156 of a figure has RAM locations from 2000 H to 20 FFH. |
| A. | random, store, load |
| B. | random, push, load |
| C. | sequential, store, pop |
| D. | sequential, push, pop |
| Answer» E. | |
| 3645. |
Which material is generally used for LED? |
| A. | Compounds of silica |
| B. | Compounds of gallium |
| C. | Compounds of phosphorus |
| D. | Compounds of sulphur |
| Answer» C. Compounds of phosphorus | |
| 3646. |
The counter shown in the given figure is |
| A. | Synchronous |
| B. | Johnson |
| C. | Ring |
| D. | None of the above |
| Answer» E. | |
| 3647. |
The number of bits in a nibble is |
| A. | 8 |
| B. | 4 |
| C. | 2 |
| D. | 16 |
| Answer» C. 2 | |
| 3648. |
Assertion (A): Decoder is not a combinational circuit.Reason (R): Every memory element of semi conductor form has a decoder. |
| 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 | |
| 3649. |
In 8085 microprocessor, in order to enable RST 5.5, RST 6.5 and RST 7.5 interrupts, which of the following instruction are needed? |
| A. | EI only |
| B. | SIM only |
| C. | EI and SIM both |
| D. | None |
| Answer» D. None | |
| 3650. |
A retriggerable one shot is one which |
| A. | can be triggered only once |
| B. | has two quasi stable states |
| C. | can not be retriggered till the complete pulse appears at output |
| D. | can be retriggered while the output is being generated |
| Answer» E. | |