MCQOPTIONS
Saved Bookmarks
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.
| 701. |
What are the contents of the accumulator after the RIC has been executed? |
| A. | 40 H |
| B. | 41 H |
| C. | 42 H |
| D. | 43 D |
| Answer» E. | |
| 702. |
For the logic circuit of the given figure, Y = |
| A. | A + BC |
| B. | BC |
| C. | AB |
| D. | AB + C |
| Answer» D. AB + C | |
| 703. |
In the TTL circuit in the figure, S2 to S0 are select lines and X7 to X0 are input lines. S0 and X0 are LSBs. The output Y is |
| A. | Indeterminate |
| B. | A ‚äï B |
| C. | A ‚äï B |
| D. | C . A ‚äï B + C . (A ‚äï B) |
| Answer» C. A ‚äï B | |
| 704. |
Assertion (A): Even if TTL gates and CMOS gates used in a realization have the same power supply of + 5 V, suitable circuit is needed to interconnect themReason (R): VOH, VOL, VIH and VIL of a TTL gave are respectively 2.4, 0.4, 2 and 0.8 V respectively. If supply voltage is + 5 V. VIL and VIH for CMOS gate for the supply voltage of + 5 V are 1.5 V and 3.5 V respectively. |
| 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 | |
| 705. |
Assume that only x and y logic inputs are available. What is the minimum number of 2-input NAND gates required to implement x ‚äï y? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 706. |
Boolean algebra obeys |
| A. | commutative law |
| B. | associative law |
| C. | distributive law |
| D. | commutative, associative and distributive law |
| Answer» E. | |
| 707. |
The counter shown in the given figure is |
| A. | Synchronous |
| B. | Johnson |
| C. | Ring |
| D. | None of the above |
| Answer» E. | |
| 708. |
In sign magnitude numbers, |
| A. | the leading bit stands for the sign |
| B. | the leading bit is part of the magnitude |
| C. | the leading bit is always 0 |
| D. | the leading bit is always 1 |
| Answer» B. the leading bit is part of the magnitude | |
| 709. |
An interrupt in which the external device supplies its address as well as the interrupt is known as |
| A. | vectored interrupt |
| B. | maskable interrupt |
| C. | polled interrupt |
| D. | non-maskable interrupt |
| Answer» B. maskable interrupt | |
| 710. |
A certain JK FF has tpd = 12 n sec the largest MOD counter that can be constructed from these FF and still operate up to 10 MHz is |
| A. | any |
| B. | 8 |
| C. | 256 |
| D. | 10 |
| Answer» D. 10 | |
| 711. |
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 | |
| 712. |
2's complement of a given 3 or more bit number of non-zero magnitude is the same as the original number if all bits except |
| A. | MSB are zero |
| B. | LSB are zero |
| C. | MSB are 1 |
| D. | LSB are 1 |
| Answer» B. LSB are zero | |
| 713. |
When all the seven segments of a display are energized, the number shown is |
| A. | 0 |
| B. | 1 |
| C. | 7 |
| D. | 8 |
| Answer» E. | |
| 714. |
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. | |
| 715. |
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 | |
| 716. |
The hexadecimal number given below represent decimal numbers which are multiples of DC, C8, BE, 46, IE |
| A. | 2 |
| B. | 6 |
| C. | 7 |
| D. | 10 |
| Answer» D. 10 | |
| 717. |
The method used to transfer data from I/O units to memory by suspending the memory-CPU data transfer for one memory cycle is called |
| A. | I/O spooling |
| B. | Cycle stealing |
| C. | Line conditioning |
| D. | Demand paging |
| Answer» C. Line conditioning | |
| 718. |
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 | |
| 719. |
The sum S of A and B in a Half Adder can be implemented by using K NAND gates. The value of K is |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | none of these |
| Answer» C. 5 | |
| 720. |
In the given figure Y = |
| A. | A |
| B. | B |
| C. | A + B + C |
| D. | ABC |
| Answer» C. A + B + C | |
| 721. |
2's complement of (-24) = |
| A. | 11101000 |
| B. | 1001000 |
| C. | 1111111 |
| D. | 111111 |
| Answer» B. 1001000 | |
| 722. |
Microprocessors find applications in |
| A. | pocket calculators |
| B. | scientific instruments |
| C. | medical equipments |
| D. | all of the above |
| Answer» E. | |
| 723. |
If A = 0101, then A' is |
| A. | 1010 |
| B. | 1011 |
| C. | 1001 |
| D. | 110 |
| Answer» C. 1001 | |
| 724. |
(1111.11)2 is |
| A. | (1.01)10 |
| B. | (0.75)10 |
| C. | (15.3)10 |
| D. | (15.75)10 |
| Answer» E. | |
| 725. |
For the logic circuit of the given figure the simplified Boolean equation |
| A. | Y = (A + B) (C + D) (E + F) |
| B. | Y = A = B + C + D + E + F |
| C. | ABCDEF |
| D. | ABC + DEF |
| Answer» B. Y = A = B + C + D + E + F | |
| 726. |
Which of the following is 'synchronous'? |
| A. | Half adder |
| B. | Full adder |
| C. | R-S flip-flop |
| D. | Clocked R-S flip-flop |
| Answer» E. | |
| 727. |
If number of information bits is 11, the number of parity bits in Hamming code is |
| A. | 5 |
| B. | 4 |
| C. | 3 |
| D. | 2 |
| Answer» C. 3 | |
| 728. |
If a microcomputer has a 64 K memory; what is the hexadecimal notations for the first memory location? |
| A. | AAAA |
| B. | FFFF |
| C. | AAA0 |
| D. | 0 |
| Answer» E. | |
| 729. |
Fastest memory cell |
| A. | bubble memory |
| B. | core memory |
| C. | semiconductor memory |
| D. | superconductor memory |
| Answer» D. superconductor memory | |
| 730. |
The number of product terms in the minimized sum of product expression obtained through the following K-map, where d, don't care. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 731. |
Assertion (A): ECL is fast as compared to TTL.Reason (R): ECL dissipates less power than TTL. |
| 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» D. A is false, R is true | |
| 732. |
A 4 bit ripple counter starts in 0000 state. When the counter reads 0010 the number of clock pulses which have occurred is |
| A. | 2 |
| B. | 18 |
| C. | 2 or 18 |
| D. | 2 or 18 or 34 |
| Answer» E. | |
| 733. |
In a microprocessor system the stack is used for |
| A. | starting the program return address whenever a subroutine jump instruction is execute |
| B. | transmitting and receiving input and output data |
| C. | starting all important CPU register contents whenever an interrupt is to be serviced |
| D. | storing program instructions for interrupt service routine |
| Answer» B. transmitting and receiving input and output data | |
| 734. |
For the NMOS gate in the given figure, F = |
| A. | ABCDE |
| B. | (AB + C) (D + E) |
| C. | A(B + C) + DE |
| D. | A + B C + DE |
| Answer» D. A + B C + DE | |
| 735. |
Binary number 1101101101 is equal to decimal number |
| A. | 3289 |
| B. | 2289 |
| C. | 1289 |
| D. | 289 |
| Answer» B. 2289 | |
| 736. |
In a modem digital computer, a subtractor in normally not used because |
| A. | subtractors are very expensive |
| B. | the design of a subtractor is very complex |
| C. | the adder is geared for doing subtraction |
| D. | most of the programs do not require subtraction |
| Answer» D. most of the programs do not require subtraction | |
| 737. |
Quantization error occurs in |
| A. | D/A converter |
| B. | A/D converter |
| C. | both D/A and A/D converter |
| D. | neither D/A nor A/D converter |
| Answer» C. both D/A and A/D converter | |
| 738. |
Consider the following instruction of 8085 μp :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. | |
| 739. |
FF16 when converted to 8421BCD = |
| A. | 0000 0101 0101 |
| B. | 0010 0101 0101 |
| C. | 1111 0101 0101 |
| D. | 1000 0101 0101 |
| Answer» C. 1111 0101 0101 | |
| 740. |
A semiconductor Read-only-Memory basically is |
| A. | a combinational logic circuit |
| B. | a set of flip-flop memory elements |
| C. | a sequential circuit with flip-flops and gates |
| D. | none of the above |
| Answer» B. a set of flip-flop memory elements | |
| 741. |
4 bit ripple counter and 4 bit synchronous counter are made using flip-flop having a propagation delay of 10 ns each. If the worst case delay in the ripple counter and the synchronous counter be R and S respectively, then |
| A. | R = 10 ns, S = 40 ns |
| B. | R = 40 ns, S = 10 ns |
| C. | R = 10 ns, S = 30 ns |
| D. | R = 30 ns, S = 10 ns |
| Answer» C. R = 10 ns, S = 30 ns | |
| 742. |
Assertion (A): BCD code is used in pocket calculatorsReason (R): BCD code is slower than binary. |
| 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 | |
| 743. |
Out of multiplexer and demultiplexer, which has select inputs? |
| A. | Multiplexer only |
| B. | Demultiplexer only |
| C. | Both multiplexer and demultiplexer |
| D. | None |
| Answer» D. None | |
| 744. |
The advantages of flash memory over EEPROM are |
| A. | higher density |
| B. | lower cost |
| C. | both higher density and lower cost |
| D. | none of the above |
| Answer» D. none of the above | |
| 745. |
A current tracer responds to |
| A. | steady current only |
| B. | pulsating current only |
| C. | both pulsating and steady current |
| D. | none of the above |
| Answer» C. both pulsating and steady current | |
| 746. |
One of the function of the Sio2 layer in an IC is to |
| A. | act as a dielectric for capacitors |
| B. | prevent shorting of elements by interconnections |
| C. | from cathodes for diodes |
| D. | afford protection from the radiations |
| Answer» C. from cathodes for diodes | |
| 747. |
Which memory requires periodic recharging? |
| A. | All ROMS |
| B. | All RAMS |
| C. | Static RAM |
| D. | Dynamic RAM |
| Answer» E. | |
| 748. |
The figure of merit for a logic family is |
| A. | gain band width product |
| B. | (propagation delay time) (power dissipation) |
| C. | (fan out) (power dissipation) |
| D. | (noise margin) (power dissipation) |
| Answer» C. (fan out) (power dissipation) | |
| 749. |
In floating point representation, mantissa is expressed in |
| A. | excess 3 notation |
| B. | gray code |
| C. | excess 32 notation |
| D. | 2's complement |
| Answer» D. 2's complement | |
| 750. |
The no. of comparators required in a 3 bit comparator type ADC is |
| A. | 2 |
| B. | 3 |
| C. | 7 |
| D. | 8 |
| Answer» D. 8 | |