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.
| 651. |
Typical switching time for ECL is |
| A. | 5 nano seconds |
| B. | 5 micro seconds |
| C. | 5 milli seconds |
| D. | 5 seconds |
| Answer» B. 5 micro seconds | |
| 652. |
In a Karnaugh map for an expression having 'don't care terms' the don't cares can be treated as |
| A. | 0 |
| B. | 1 |
| C. | 1 or 0 |
| D. | none of the above |
| Answer» D. none of the above | |
| 653. |
A 12 bit ADC is operating with 1 μs clock period. Total conversion time is 14 μs. ADC is |
| A. | flash type |
| B. | counting type |
| C. | integrating type |
| D. | successive approximation type |
| Answer» D. successive approximation type | |
| 654. |
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. | |
| 655. |
The process of entering data into ROM is called |
| A. | writing |
| B. | burning |
| C. | decoding |
| D. | registering |
| Answer» C. decoding | |
| 656. |
The problem of logic race occurs in |
| A. | SOP functions |
| B. | POS functions |
| C. | Hybrid function |
| D. | SOP and POS functions |
| Answer» D. SOP and POS functions | |
| 657. |
Two numbers in excess-3 code are added and the result is less than 8. To get equivalent binary |
| A. | 0011 is subtracted |
| B. | 0011 is added |
| C. | 0110 is subtracted |
| D. | 0110 is added |
| Answer» D. 0110 is added | |
| 658. |
The output voltage of 5-bit D/A binary ladder that has a digital input of 11010 (Assuming 0 = 0 V and 1 = + 10 V) is |
| A. | 3.4375 V |
| B. | 6.0 V |
| C. | 8.125 V |
| D. | 8.6875 V |
| Answer» D. 8.6875 V | |
| 659. |
The output data lines of microprocessor and memories are usually tristated because |
| A. | more than one device can transmit information over the data bus by enabling only one device at a time |
| B. | more than one device can transmit information over the data bus at the same time |
| C. | the data lines can be multiplexed for both I/P and O/P |
| D. | it increases the speed of data transfers over the data bus |
| Answer» B. more than one device can transmit information over the data bus at the same time | |
| 660. |
A five bit binary adder is used to add 01001 and 00111. The adders from LSB position are numbered as FA0, FA1, FA2 and FA3. The outputs of FA2 are |
| A. | SUM = 0 |
| B. | SUM = 0, CARRY = 1 |
| C. | SUM = 1, CARRY = 0 |
| D. | SUM = 1, CARRY = 1 |
| Answer» B. SUM = 0, CARRY = 1 | |
| 661. |
If the mantissa of a digital computer is 37 bit long then the accuracy of the digital computer will be of |
| A. | 37 decimal places |
| B. | 23 decimal places |
| C. | 11 decimal places |
| D. | accuracy is independent of the length to mantissa |
| Answer» D. accuracy is independent of the length to mantissa | |
| 662. |
The number of logic devices required in a Mod-16 synchronous counter are |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 663. |
Is the interrupt-enable flag? |
| A. | Low |
| B. | High |
| C. | Never |
| D. | None |
| Answer» C. Never | |
| 664. |
ALU carries out |
| A. | arithmetic operations |
| B. | logic operations |
| C. | both arithmetic and logic operations |
| D. | none of the above |
| Answer» D. none of the above | |
| 665. |
(FE35)16 XOR (CB15)16 is equal to |
| A. | (3320)16 |
| B. | (FE35)16 |
| C. | (FF50)16 |
| D. | (3520)l6 |
| Answer» E. | |
| 666. |
74 HC series can sink upto 4 mA. The 74 LS series has IIL(max) - 0.4 mA. How many 74 LS inputs be driven by 74 HC output? |
| A. | 100 |
| B. | none |
| C. | 8 |
| D. | 10 |
| Answer» E. | |
| 667. |
Fundamental mode is another name for |
| A. | level operation |
| B. | pulse operation |
| C. | clock operation |
| D. | none of these |
| Answer» C. clock operation | |
| 668. |
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 | |
| 669. |
A microcomputer has memory locations from 0000 to FFFF, each storing 1 byte. How many bytes can be the memory store? |
| A. | 12333 |
| B. | 14666 |
| C. | 16384 |
| D. | 16655 |
| Answer» D. 16655 | |
| 670. |
A decoder can be used as a demultiplexer. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 671. |
Four memory chips of 16 x 4 size have their address buses connected together. This system will be of size |
| A. | 64 x 4 |
| B. | 16 x 16 |
| C. | 32 x 8 |
| D. | 256 x 1 |
| Answer» C. 32 x 8 | |
| 672. |
In a ring counter for N clock pulses the scale for the counter is |
| A. | N : 1 |
| B. | N : 2 |
| C. | N : 10 |
| D. | N : 100 |
| Answer» B. N : 2 | |
| 673. |
In a 4 input OR gate, the total number of High outputs for the 16 input states are |
| A. | 16 |
| B. | 15 |
| C. | 14 |
| D. | 13 |
| Answer» C. 14 | |
| 674. |
A logical expression Y = A + AB is equal to |
| A. | Y = AB |
| B. | Y = AB |
| C. | Y = A + B |
| D. | Y = A + B |
| Answer» E. | |
| 675. |
Assertion (A): In a magnitude comparator IC the cascading inputs provide a means to cascade the 4 bit comparators Reason (R): A magnitude comparator has three outputs, A = B, A > B and A < B |
| 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 | |
| 676. |
Current requirement of a piezo buffer is about |
| A. | 100mA |
| B. | 20mA |
| C. | 4mA |
| D. | 0.4mA |
| Answer» D. 0.4mA | |
| 677. |
In a four variable K map eight adjacent cells give |
| A. | single variable term |
| B. | two variable term |
| C. | three variable term |
| D. | four variable term |
| Answer» B. two variable term | |
| 678. |
-8 is equal to signed binary number |
| A. | 10001000 |
| B. | 1000 |
| C. | 10000000 |
| D. | 11000000 |
| Answer» B. 1000 | |
| 679. |
The number of counter states which an 8 bit stair step A/D converter has to pass through before conversion takes place is equal to |
| A. | 1 |
| B. | 8 |
| C. | 255 |
| D. | 256 |
| Answer» E. | |
| 680. |
Binary multiplication can be done by repeated addition. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 681. |
A 555 timer can be used as |
| A. | an astable multivibrator |
| B. | monostable multivibrator |
| C. | frequency Divider only |
| D. | any of the above |
| Answer» E. | |
| 682. |
The number of bits in EBCDIC is |
| A. | 12 |
| B. | 10 |
| C. | 8 |
| D. | 6 |
| Answer» D. 6 | |
| 683. |
The initial state of a Mod-16 counter is 0110. After 37 clock pulses the state of counter will be |
| A. | 1011 |
| B. | 110 |
| C. | 10 |
| D. | 1 |
| Answer» B. 110 | |
| 684. |
Which of the following memory is preferred in case of calculators? |
| A. | Dynamic RAM |
| B. | Dynamic ROM |
| C. | Static ROM |
| D. | Static RAM |
| Answer» B. Dynamic ROM | |
| 685. |
Given figure is the voltage transfer characteristic of |
| A. | an N MOS inverter with enhanced mode transistor as load |
| B. | an N MOS inverter with depletion mode transistor as load |
| C. | a CMOS inverter |
| D. | BJT inverter |
| Answer» D. BJT inverter | |
| 686. |
Assertion (A): Boolean expressions can be easily simplified using Karnaugh map.Reason (R): Karnaugh map can be drawn for minterms as well as max terms. |
| 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 | |
| 687. |
Digital technologies being used now-a-days are |
| A. | DTL and EMOS |
| B. | TTL, ECL, CMOS and RTL |
| C. | TTL, ECL and CMOS |
| D. | TTL, ECL. CMOS and DTL |
| Answer» C. TTL, ECL and CMOS | |
| 688. |
In 8085 microprocessor, which of the following interrupts has the lowest priority? |
| A. | RST 5.5 |
| B. | RST 7.5 |
| C. | TRAP |
| D. | INTR |
| Answer» B. RST 7.5 | |
| 689. |
A + AB = |
| A. | A |
| B. | A |
| C. | A + B |
| D. | A + B |
| Answer» D. A + B | |
| 690. |
Binary number 1101 is equal to octal number |
| A. | 17 |
| B. | 16 |
| C. | 15 |
| D. | 14 |
| Answer» D. 14 | |
| 691. |
Number of cards read per minute by a card reader may be of the order of |
| A. | 20 |
| B. | 1 |
| C. | 10000 |
| D. | 300 |
| Answer» E. | |
| 692. |
The K-map for a Boolean function is shown in figure. The number of essential prime implicants for this function is |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» B. 5 | |
| 693. |
In a clocked NAND latch, race condition occur when |
| A. | R and S are high CLK is low |
| B. | R and CLK are high and S is low |
| C. | R, S, CLK are high |
| D. | R, S, CLK are low |
| Answer» D. R, S, CLK are low | |
| 694. |
Without any addition circuitry, an 8:1 MUX can be used to obtain. |
| A. | some but not all Boolean functions of 3 variables |
| B. | all functions of 3 variables but none of 4 variables |
| C. | all functions of 3 variables and some but not all of 4 variables |
| D. | all functions of 4 variables |
| Answer» C. all functions of 3 variables and some but not all of 4 variables | |
| 695. |
Assertion (A): It is possible that a digital circuit gives the same output for different input voltages Reason (R): A digital circuit is also called logic circuit. |
| 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 | |
| 696. |
The minterm designation for ABCD is |
| A. | m8 |
| B. | m10 |
| C. | m14 |
| D. | m15 |
| Answer» E. | |
| 697. |
A seven bit code (even parity) 1111101 may have error. The correct code is |
| A. | 1111101 |
| B. | 1111111 |
| C. | 101011 |
| D. | 1100011 |
| Answer» C. 101011 | |
| 698. |
Program counter in a digital computer |
| A. | counts the number of program run in the machine |
| B. | counts the number of times a subroutine is called |
| C. | counts the number of times the loops are executed |
| D. | points the memory address of the current or the next instruction to be executed |
| Answer» E. | |
| 699. |
Two voltages are -5 V and -10 V. In positive logic |
| A. | -5 V is 1 and -10 V is 0 |
| B. | -10 V is 1 and -5 V is 0 |
| C. | -5 V is 1 in some circuits and 0 in others |
| D. | -10 V is 1 in some circuits and 0 in others |
| Answer» B. -10 V is 1 and -5 V is 0 | |
| 700. |
The number of unused states in a 4 bit Johnson counter is |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 12 |
| Answer» D. 12 | |