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MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 1701. |
A 16 bit binary adder has |
| A. | 16 half adders |
| B. | 16 full adders |
| C. | one half adders and 15 full adders |
| D. | 8 half adders and eight full adders |
| Answer» D. 8 half adders and eight full adders | |
| 1702. |
A 3 bit binary adder can add |
| A. | 2 bits |
| B. | 2 bits |
| C. | 3 bits |
| D. | 8 bits |
| Answer» D. 8 bits | |
| 1703. |
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 | |
| 1704. |
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 | |
| 1705. |
BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are |
| A. | a, b, d |
| B. | a, b, c |
| C. | all |
| D. | a, b, g, c, d |
| Answer» D. a, b, g, c, d | |
| 1706. |
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. | |
| 1707. |
TTL is used in electronic calculators. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 1708. |
In the DRAM cell in the figure is the Vt of the NMOSFET is 1 V. For the following three combinations of WL and BL voltages. |
| A. | 5 V, 3 V, 7 V |
| B. | 4 V, 3 V, 4 V |
| C. | 5 V, 5 V, 5 V |
| D. | 4 V, 4 V, 4 V |
| Answer» D. 4 V, 4 V, 4 V | |
| 1709. |
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 | |
| 1710. |
Which binary addition is incorrect? |
| A. | 1101.1 + 1011.1 = 11001.0 |
| B. | 101101 + 1101101 + 1100011 |
| C. | 0.0011 + 0.1110 + 1.0001 |
| D. | 1100.001 + 1011.011 = 10111.100 |
| Answer» E. | |
| 1711. |
The advantages of high density IC are |
| A. | more circuits on chip |
| B. | high operating speed |
| C. | low power consumption |
| D. | both (a) and (b) |
| Answer» E. | |
| 1712. |
Dual slope ADC uses an op amp comparator. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 1713. |
(FE35)₁₆ XOR (CB15)₁₆ is equal to |
| A. | (3320)₁₆ |
| B. | (FE35)₁₆ |
| C. | (FF50)₁₆ |
| D. | (3520)₁₆ |
| Answer» E. | |
| 1714. |
When two 4 bit parallel adders are cascaded we get |
| A. | 4 bit parallel adder |
| B. | 8 bit parallel adder |
| C. | 16 bit parallel adder |
| D. | none of the above |
| Answer» C. 16 bit parallel adder | |
| 1715. |
In 8086 microprocessor, if the segment register contains 1 FAB and IP register contains 10AI, the effective memory address is |
| A. | 20B51 |
| B. | 304C |
| C. | FBC0 |
| D. | FDB5 |
| Answer» B. 304C | |
| 1716. |
A microprocessor with a 16-bit address bus is used in a linear memory selection configuration (i.e., Address bus lines are directly used as chip selects of memory chips) with 4 memory chips. The maximum addressable memory space is |
| A. | 64 K |
| B. | 16 K |
| C. | 8 K |
| D. | 4 K |
| Answer» B. 16 K | |
| 1717. |
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. | |
| 1718. |
For the shaded area in Venn diagram of the given figure, the Boolean expression is |
| A. | AB + BC + CA |
| B. | ABC + A B C |
| C. | ABC + A B C |
| D. | ABC+AB |
| Answer» B. ABC + A B C | |
| 1719. |
ECL can be used to high frequencies in the order of |
| A. | 500 kHz |
| B. | 1 MHz |
| C. | 100 MHz |
| D. | 500 MHz |
| Answer» E. | |
| 1720. |
TTL circuit with active pull up is preferred because of its suitability for |
| A. | wired AND operation |
| B. | bus operated system |
| C. | wired logic operation |
| D. | reasonable dissipation and speed of operation |
| Answer» E. | |
| 1721. |
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 | |
| 1722. |
The principal of locality of reference justifies the use of |
| A. | interrupts |
| B. | DMA |
| C. | virtual memory |
| D. | cache memory |
| Answer» E. | |
| 1723. |
In 8085 microprocessor, what is the length of PC (program counter)? |
| A. | 6 bits |
| B. | 8 bit |
| C. | 12 bits |
| D. | 16 bits |
| Answer» E. | |
| 1724. |
Which of the following are included in the architecture of computer? 1. Addressing mode, design of CPU2. Instruction set, data format3. Secondary memory, operating system Select the correct answer using the codes given below: |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» B. 2 and 3 | |
| 1725. |
Hexadecimal number E is equal to binary number |
| A. | 1110 |
| B. | 1101 |
| C. | 1001 |
| D. | 1111 |
| Answer» B. 1101 | |
| 1726. |
The internal structure of PL A is similar to |
| A. | RAM |
| B. | ROM |
| C. | both RAM and ROM |
| D. | neither RAM nor ROM |
| Answer» E. | |
| 1727. |
Examine the following truth table. The product of sum from this truth table is |
| A. | (X̅ + Y̅) (X + Y) |
| B. | (X + Y̅) (X̅ + Y̅) |
| C. | (X̅ + Y) (X̅ + Y̅) |
| D. | (X + Y̅) (X + Y) |
| Answer» E. | |
| 1728. |
A seven bit code (even parity) 1111101 may have error. The correct code is |
| A. | 1111101 |
| B. | 1111111 |
| C. | 0101011 |
| D. | 1100011 |
| Answer» C. 0101011 | |
| 1729. |
Words having 8 bits are to be stored into computer memory. The number of lines required for writing into memory are |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» E. | |
| 1730. |
It is desired to route data from many registers to one register. The device needed is |
| A. | decoder |
| B. | multiplexer |
| C. | demultiplexer |
| D. | counter |
| Answer» C. demultiplexer | |
| 1731. |
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. | |
| 1732. |
In floating point representation, the number of bits of mantissa is |
| A. | 10 |
| B. | 9 |
| C. | 8 |
| D. | 7 |
| Answer» B. 9 | |
| 1733. |
A mod-2 counter followed by a mod 5 is same as |
| A. | mod-7 counter |
| B. | A decade counter |
| C. | mod-3 counter |
| D. | none |
| Answer» C. mod-3 counter | |
| 1734. |
In order to enable RST 5.5, RST 6.5 and RST 7.5 interrupts, which of the following instructions are needed? |
| A. | El only |
| B. | SIM only |
| C. | El and SIM only |
| D. | None |
| Answer» D. None | |
| 1735. |
The circuit in the figure is has two CMOS-NOR gates. This circuit functions as a |
| A. | flip-flop |
| B. | schmitt trigger |
| C. | monostable multivibrator |
| D. | astable multivibrator |
| Answer» D. astable multivibrator | |
| 1736. |
A NOR gate has 3 inputs A, B, C. For which combination of inputs is output HIGH |
| A. | A = B = C = 0 |
| B. | A = B = C = 1 |
| C. | A = B = 1 and C = 0 |
| D. | A = C = 1 and B = 0 |
| Answer» B. A = B = C = 1 | |
| 1737. |
Bit is |
| A. | smallest piece of electronic hardware |
| B. | a drilling tool |
| C. | an abbreviation for binary digit |
| D. | the smallest number |
| Answer» D. the smallest number | |
| 1738. |
Which of the following input is not possible in case of a SR flip-flop? |
| A. | S = 0, R = 0 |
| B. | S = 0, R = 1 |
| C. | S = 1, R = 0 |
| D. | S = 1, R = 1 |
| Answer» E. | |
| 1739. |
Assertion (A): The carry look ahead adder is very fast Reason (R): The carry look ahead adder generates the carry and sum digits directly. |
| 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 | |
| 1740. |
In a digital counter the number of flip-flops is |
| A. | always 2 |
| B. | always even |
| C. | always odd |
| D. | equal to the number of bits required in the final binary count |
| Answer» D. equal to the number of bits required in the final binary count | |
| 1741. |
For the circuit shown in the figure, what is the frequency of the output Q? |
| A. | Twice the input clock frequency |
| B. | Half the input clock frequency |
| C. | Same as input clock frequency |
| D. | Inverse of the propagation delay of the FF |
| Answer» C. Same as input clock frequency | |
| 1742. |
1274₁₆ - 3A7₁₆ = __________ . |
| A. | ACA₁₆ |
| B. | ACB₁₆ |
| C. | ECD₁₆ |
| D. | AAA₁₆ |
| Answer» D. AAA₁₆ | |
| 1743. |
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 | |
| 1744. |
The number of bits in ASCII is |
| A. | 12 |
| B. | 10 |
| C. | 9 |
| D. | 7 |
| Answer» E. | |
| 1745. |
The Truth Table shown is for a |
| A. | CMO |
| B. | counter |
| C. | flip-flop |
| D. | half adder |
| Answer» E. | |
| 1746. |
A VF display operates on the principle of a vacuum diode. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 1747. |
A̅̅ + AB̅ = |
| A. | A |
| B. | A̅ |
| C. | A̅ + B̅ |
| D. | A + B̅ |
| Answer» D. A + B̅ | |
| 1748. |
4 bit 2's complement representation of a decimal number is 1000. The number is |
| A. | + 8 |
| B. | 0 |
| C. | - 7 |
| D. | - 8 |
| Answer» E. | |
| 1749. |
In a J-K flip flop the input J = K = 1 pulse is about |
| A. | set |
| B. | reset |
| C. | no change |
| D. | toggle |
| Answer» E. | |
| 1750. |
The basic shift register operations are |
| A. | serial in - serial out |
| B. | serial in - parallel out |
| C. | parallel in - serial out |
| D. | all of the above |
| Answer» E. | |