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.
| 751. |
Assertion (A): Schottky transistors are preferred over normal transistors in digital circuits Reason (R): A Schottky transistor when used as a switch, between cutoff and active region. |
| 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 | |
| 752. |
One XOR gate can work as |
| A. | one bit magnitude comparator |
| B. | two bit magnitude comparator |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. two bit magnitude comparator | |
| 753. |
ECL has high switching speed because the transistors are |
| A. | switching between cutoff and saturation regions |
| B. | switching between cutoff and active regions |
| C. | switching between active and saturation regions |
| D. | none of the above |
| Answer» C. switching between active and saturation regions | |
| 754. |
What is the length of SP (Stack pointer) of 8085 μp? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» E. | |
| 755. |
The number of bits in a nibble is |
| A. | 8 |
| B. | 4 |
| C. | 2 |
| D. | 16 |
| Answer» C. 2 | |
| 756. |
Which of the following logic family is fastest of all? |
| A. | TTL |
| B. | RTL |
| C. | DCTL |
| D. | ECL |
| Answer» E. | |
| 757. |
A universal shift register can shift |
| A. | from left to right |
| B. | from right to left |
| C. | both from left to right and right to left |
| D. | none of the above |
| Answer» D. none of the above | |
| 758. |
The initial state of MOD-16 down counter is 0110. What state will it be after 37 clock pulses? |
| A. | Indeterminate |
| B. | 110 |
| C. | 101 |
| D. | 1 |
| Answer» E. | |
| 759. |
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 | |
| 760. |
Which of the following conversion is incorrect? |
| A. | 2048.0625 = 100000000000.00012 |
| B. | 100000011.10012 = 131.562510 |
| C. | 1011012 = 458 |
| D. | Hexadecimal B6C7 = 4679110 |
| Answer» D. Hexadecimal B6C7 = 4679110 | |
| 761. |
A 3 input NAND gate is to be used as inverter. Which of the following will give better results? |
| A. | The two unused inputs are left open |
| B. | The two unused inputs are connected to 0 |
| C. | The two unused inputs are connected to 1 |
| D. | None of the above |
| Answer» D. None of the above | |
| 762. |
An A/D converter uses for reference purposes |
| A. | DC voltage |
| B. | a saw tooth generator |
| C. | set of keys |
| D. | a flip-flop |
| Answer» C. set of keys | |
| 763. |
A 4 bit parallel type A/D converter uses a 6 volt reference. How many comparators are required and what is the resolution in volts? |
| A. | 0.375 V |
| B. | 15 V |
| C. | 4.5 V |
| D. | 10 V |
| Answer» B. 15 V | |
| 764. |
Assuming accumulator contain A 64 and the carry is set (1).What will register A and (CY) contain after RAR? |
| A. | 4 DH, 0 |
| B. | D 3H, 0 |
| C. | 4 DH, 1 |
| D. | 53 H, 0 |
| Answer» C. 4 DH, 1 | |
| 765. |
A XOR gate has inputs A and B and output Y. Then the output equation is |
| A. | Y = AB |
| B. | Y = AB + A B |
| C. | Y = A B + A B |
| D. | Y = A B + A B |
| Answer» D. Y = A B + A B | |
| 766. |
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 | |
| 767. |
Recommended fanout for ECL is |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 25 |
| Answer» E. | |
| 768. |
All digital circuits can be realised using only |
| A. | EX-OR gates |
| B. | Multiplexers |
| C. | Half adders |
| D. | OR gates |
| Answer» C. Half adders | |
| 769. |
A 16:1 multiplexer has 4 select input lines. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 770. |
In a decimal digital computer, the number 127 is stored |
| A. | 1111111 |
| B. | 0001 00100111 |
| C. | 10001 |
| D. | 11000111 |
| Answer» B. 0001 00100111 | |
| 771. |
Parallel adder is |
| A. | sequential circuit |
| B. | combinational circuit |
| C. | either sequential or combinational circuit |
| D. | none of the above |
| Answer» C. either sequential or combinational circuit | |
| 772. |
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. | |
| 773. |
23.610 = __________ 2 |
| A. | 11111.1001 |
| B. | 10111.1001 |
| C. | 111.101 |
| D. | 10111.1 |
| Answer» C. 111.101 | |
| 774. |
Some of MOS families are PMOS, CMOS, the family dominating the LSI field, where low power consumption is necessary is |
| A. | NMOS |
| B. | CMOS |
| C. | PMOS |
| D. | both NMOS, CMOS |
| Answer» C. PMOS | |
| 775. |
In the generic microprocessor |
| A. | instruction cycle time period is shorter than machine cycle time period |
| B. | machine cycle time period is shorter than instruction cycle time period |
| C. | instruction cycle time period is exactly half of machine cycle time period |
| D. | instruction cycle time period is exactly equal to machine cycle time period |
| Answer» C. instruction cycle time period is exactly half of machine cycle time period | |
| 776. |
11012 - 10012 = |
| A. | 1000 |
| B. | 100 |
| C. | 10 |
| D. | 1 |
| Answer» C. 10 | |
| 777. |
A binary ladder network D/A converter requires |
| A. | resistors of one value only |
| B. | resistors of many different values |
| C. | resistors of two different values |
| D. | none of the above |
| Answer» D. none of the above | |
| 778. |
The binary number 101100.110 in octal number will be |
| A. | 152.6 |
| B. | 154.6 |
| C. | 145.6 |
| D. | 174.6 |
| Answer» C. 145.6 | |
| 779. |
In 8085 microprocessor, which of the following is not vectored interrupt? |
| A. | RST 5.5 |
| B. | RST 6.5 |
| C. | RST 7.5 |
| D. | INTR |
| Answer» E. | |
| 780. |
A register is |
| A. | a group is memories |
| B. | a group of devices that store digital data |
| C. | a chip used in computers |
| D. | a pure silica piece used in digital systems |
| Answer» C. a chip used in computers | |
| 781. |
The device 'one shot' has |
| A. | two stable states |
| B. | one stable state |
| C. | either 1 or 2 stable states |
| D. | no stable state |
| Answer» C. either 1 or 2 stable states | |
| 782. |
Status register in the 8156 is read with |
| A. | IN 20 H |
| B. | OUT 20 H |
| C. | either (a) or (b) |
| D. | none of the above |
| Answer» B. OUT 20 H | |
| 783. |
In hexadecimal number system, A is equal to decimal number |
| A. | 10 |
| B. | 11 |
| C. | 17 |
| D. | 18 |
| Answer» B. 11 | |
| 784. |
Subroutines are used in larger programs not |
| A. | to increase the programming case |
| B. | to reduce storage equipment |
| C. | to reduce program extension time |
| D. | for ease of program testing at the program development time |
| Answer» E. | |
| 785. |
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 | |
| 786. |
(62)10 in binary system is |
| A. | 110000 |
| B. | 111100 |
| C. | 111110 |
| D. | 111111 |
| Answer» D. 111111 | |
| 787. |
The open collector gates in the given figure are tied together. The output Y = |
| A. | A + B + C + D |
| B. | A + B + C + D |
| C. | (A + B) (C + D) |
| D. | AB + CD |
| Answer» B. A + B + C + D | |
| 788. |
With a JK master-slave flip-flop the master is clocked when the clock is __________ , and the slave is triggered when the clock is __________ . |
| A. | low, low |
| B. | high, low |
| C. | low, high |
| D. | high, high |
| Answer» C. low, high | |
| 789. |
In 8085 microprocessor, what is the length of temporary register? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» C. 12 bits | |
| 790. |
In which of these does thermionic emission occur? |
| A. | LED |
| B. | LCD |
| C. | VF display |
| D. | None |
| Answer» D. None | |
| 791. |
For a microprocessor system using IO-mapped IO the following statement is NOT true |
| A. | memory space available is greater |
| B. | not all data transfer instructions are available |
| C. | IO and memory address spaces are distinct |
| D. | IO address space is greater |
| Answer» E. | |
| 792. |
ICs are |
| A. | analog |
| B. | digital |
| C. | both analog and digital |
| D. | mostly analog |
| Answer» D. mostly analog | |
| 793. |
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. | |
| 794. |
Binary 1000 multiplied by binary 1000 gives |
| A. | 10000 |
| B. | 100000 |
| C. | 1000000 |
| D. | 10000000 |
| Answer» D. 10000000 | |
| 795. |
The output Y of the circuit shown in the figure is |
| A. | (A + B) C + DE |
| B. | AB + C(D + E) |
| C. | (A + B) C + D + E |
| D. | (AB + C) . DE |
| Answer» B. AB + C(D + E) | |
| 796. |
The number of digit 1 present in the binary representation of 3 x 512 + 7 x 64 + 5 x 8 + 3 is |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 797. |
Karnaugh map can not be drawn when the number of variables is more than 4 |
| A. | 1 |
| B. | |
| Answer» C. | |
| 798. |
The two outputs of RS flip-flop are |
| A. | always low |
| B. | always high |
| C. | either low or high |
| D. | always complementary |
| Answer» E. | |
| 799. |
+12 V supply is given to plates a, d, g, and 0 V to other plates and grid of a VF display. The plates which will glow are |
| A. | a, d, g |
| B. | b, c, e, f |
| C. | all |
| D. | none |
| Answer» D. none | |
| 800. |
Assertion (A): ECL gate has very high speed of operation.Reason (R): Transistors in ECL do not go into saturation region. |
| 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 | |