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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.
| 601. |
If noise margin is high, there is lesser chance of false operation. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 602. |
A half adder adds __________ bits and a full adder adds __________ bits. |
| A. | two, three |
| B. | three, four |
| C. | four, six |
| D. | two, four |
| Answer» B. three, four | |
| 603. |
A pulse train with a 1 MHz frequency is counted using a 1024 modulus ripple counter using JK flip flops. The maximum propagation delay for each flip-flop should be |
| A. | 1 μs |
| B. | 0.5 μs |
| C. | 0.2 μs |
| D. | 0.1 μs |
| Answer» E. | |
| 604. |
Binary number 11011.01 when converted to its 2's complement will become |
| A. | 0101.110 |
| B. | 01111.10 |
| C. | 01100.10 |
| D. | 00100.11 |
| Answer» E. | |
| 605. |
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 | |
| 606. |
What will be output for decimal input 82? |
| A. | 0.82 V |
| B. | 8 V |
| C. | 0.1 V |
| D. | 10 mV |
| Answer» B. 8 V | |
| 607. |
In a 4 bit full adder how many half adders and OR gates are required |
| A. | 8 and 4 |
| B. | 7 and 4 |
| C. | 7 and 3 |
| D. | 8 and 3 |
| Answer» D. 8 and 3 | |
| 608. |
Which liquid crystal is used for LCD display? |
| A. | Mercury |
| B. | Pneumatic fluid |
| C. | Aqua regia |
| D. | Liquid boron |
| Answer» C. Aqua regia | |
| 609. |
EPROM can be |
| A. | UVPROM |
| B. | EEPROM |
| C. | both UVPROM and EEPROM |
| D. | none of the above |
| Answer» D. none of the above | |
| 610. |
The MOS symbol shown indicates that 1. It is depletion type2. It is enhancement type3. It is channel4. It is P-channel5. Electrons flow from s to D6. Holes flow from D to s The true statements are |
| A. | 1, 3, 6 |
| B. | 1, 3, 5 |
| C. | 2, 4, 6 |
| D. | 2, 3, 5 |
| Answer» E. | |
| 611. |
Point out the wrong statement, Sequential logic circuit is |
| A. | one that requires a clock to change states |
| B. | one in which past affects the present states |
| C. | one whose outputs changes immediately when the inputs change |
| D. | also called clock logic or synchronous logic |
| Answer» D. also called clock logic or synchronous logic | |
| 612. |
Which of the following can provide a digital signal? |
| A. | Slow change in the value of a resister |
| B. | Sine wave |
| C. | Square wave |
| D. | Gradual turning of a potentiometer |
| Answer» D. Gradual turning of a potentiometer | |
| 613. |
In Schottky TTL, a Schottky diode is used for |
| A. | forming the gate |
| B. | connecting the resistor |
| C. | clamping of the basic collector junction |
| D. | none of the above |
| Answer» D. none of the above | |
| 614. |
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 | |
| 615. |
In 2's complement representation, a certain negative number - N is 1011. The representation for + N is |
| A. | 0100 |
| B. | 0101 |
| C. | 0110 |
| D. | 0011 |
| Answer» C. 0110 | |
| 616. |
Schottky clamping is resorted to in TTL gates |
| A. | to reduce propagation delay |
| B. | to increase noise margin |
| C. | to increase packing density |
| D. | to increase fan out |
| Answer» B. to increase noise margin | |
| 617. |
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 | |
| 618. |
A 3 bit synchronous counter uses FF with propagation delay time of 20 ns each. The maximum possible time required for change of state will be. |
| A. | 60 ns |
| B. | 40 ns |
| C. | 20 ns |
| D. | None |
| Answer» C. 20 ns | |
| 619. |
Consider the following statements Timer 555 can be used as 1. monostable multivibrator2. bistable multivibrator3. astable multivibrator Which of the above statements are correct? |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 1, 2, 3 |
| Answer» C. 2 and 3 | |
| 620. |
The minimum number of comparators required to build an 8 bit flash ADC is |
| A. | 8 |
| B. | 63 |
| C. | 255 |
| D. | 256 |
| Answer» D. 256 | |
| 621. |
Which family of logic circuits uses field effect transistors? |
| A. | TTL |
| B. | CMOS |
| C. | Both LED and well as LCD |
| D. | None of the above |
| Answer» C. Both LED and well as LCD | |
| 622. |
If a microcomputer has a 64 K memory; what is the hexadecimal notations for the last memory location? |
| A. | 1111 |
| B. | 1A1A |
| C. | EEEF |
| D. | FFFF |
| Answer» E. | |
| 623. |
In a 4 bit parallel in parallel out shift register A = 1, B = 1, C = 0, D = 1. The data output after 3 clock pulses is |
| A. | 1101 |
| B. | 1001 |
| C. | 0101 |
| D. | 0001 |
| Answer» B. 1001 | |
| 624. |
The simplest register is |
| A. | buffer register |
| B. | shift register |
| C. | controlled buffer register |
| D. | bidirectional register |
| Answer» B. shift register | |
| 625. |
In magnetic film memory, the memory element consits of |
| A. | plated wires |
| B. | superconductive material |
| C. | nickel iron alloy |
| D. | doped aluminium |
| Answer» D. doped aluminium | |
| 626. |
As per Boolean algebra, inputs can be interchanged in |
| A. | OR gates |
| B. | AND gates |
| C. | both OR and AND gates |
| D. | none of the above |
| Answer» D. none of the above | |
| 627. |
The following switching functions are to be implemented using a decoder 1. f1 = ∑m (1, 2, 4, 8, 10, 14)2. f2 = ∑m (2, 5, 9, 15)3. f3 = ∑m (2, 4, 5, 6, 7) The minimum configuration of decoder is |
| A. | 2 to 4 line |
| B. | 3 to 8 line |
| C. | 4 to 16 line |
| D. | 5 to 32 line |
| Answer» D. 5 to 32 line | |
| 628. |
In N channel MOSFET with gate reverse biased, the gate current is of the order |
| A. | 10‾³ amp |
| B. | 10‾⁶ amp |
| C. | 10‾⁹ amp |
| D. | 10‾¹² amp |
| Answer» E. | |
| 629. |
An equivalent 2's complement representation of the 2's complement number 1101 is |
| A. | 110100 |
| B. | 001101 |
| C. | 110111 |
| D. | 111101 |
| Answer» E. | |
| 630. |
Assertion (A): A PROM can be used as a synchronous counter Reason (R): Each memory location in a PROM can be read synchronously. |
| 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» E. | |
| 631. |
Multiplexer can be used as logic function generator. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 632. |
The Boolean function A + BC is a reduced form of |
| A. | AB + BC |
| B. | (A + B) . (A + C) |
| C. | A̅B + AB̅C |
| D. | (A + C) . B |
| Answer» D. (A + C) . B | |
| 633. |
A depletion type NMOS is operated in enhancement mode. Vp = - 4 volts. For VGS = + 3 volts as VDS is increased, ID becomes nearly constant when Vps equals |
| A. | 1 volt |
| B. | 3 volts |
| C. | 4 volt |
| D. | 7 volts |
| Answer» E. | |
| 634. |
In a 4 input AND gate, the total number of High outputs for 16 input states are |
| A. | 16 |
| B. | 8 |
| C. | 4 |
| D. | 1 |
| Answer» E. | |
| 635. |
The Central Processing Unit (CPU) of the 16-processor system developed by hardware and software teams of C-DOT, Bangalore is configured around |
| A. | Motorola 68020 |
| B. | Motorola 68040 |
| C. | Intel 80386 |
| D. | Intel 80486 |
| Answer» B. Motorola 68040 | |
| 636. |
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 | |
| 637. |
A 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity then resolution in percent and volts. |
| A. | 3% 7 V |
| B. | 6.4 V, 2% |
| C. | 0.1%, 1.57 V |
| D. | 1.57%, 0.1 V |
| Answer» E. | |
| 638. |
Read the following statements: Dual slope ADC provides 1. higher speed as compared to other ADC2. very good accuracy3. good rejection of power supply4. better resolutions compared to other ADC for the same number of bits Which of the above are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1, 2, 3 |
| D. | 1, 2, 3, 4 |
| Answer» C. 1, 2, 3 | |
| 639. |
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 | |
| 640. |
In 8085 microprocessor, a RIM instruction is used to |
| A. | disable the interrupts 7.5, 6.5, 5.5 |
| B. | enable the interrupts 7.5, 6.5, 5.5 |
| C. | read in the serial input data |
| D. | none of the above |
| Answer» D. none of the above | |
| 641. |
The hexadecimal number (3E8)₁₆ is equal to decimal number |
| A. | 1000 |
| B. | 982 |
| C. | 768 |
| D. | 323 |
| Answer» B. 982 | |
| 642. |
Least expensive logic |
| A. | RTL |
| B. | DTL |
| C. | TTL |
| D. | ECL |
| Answer» B. DTL | |
| 643. |
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 | |
| 644. |
The code which provides for parity check is |
| A. | Baudot |
| B. | ASCII |
| C. | EBCDIC |
| D. | Excess-3 |
| Answer» C. EBCDIC | |
| 645. |
The amplifier used in bootstrap voltage sweep should have a gain of |
| A. | +1 |
| B. | +∞ |
| C. | -1 |
| D. | -∞ |
| Answer» D. -∞ | |
| 646. |
Equation x₁₀ = 11001001₂ when solved for x gives the value of x as |
| A. | 8 |
| B. | 111 |
| C. | 152 |
| D. | 201 |
| Answer» E. | |
| 647. |
An AND gate has four inputs. One of the inputs is low and other inputs are high. The output |
| A. | is low |
| B. | is high |
| C. | is alternately low and high |
| D. | may be high or low depending on relative magnitudes of inputs |
| Answer» B. is high | |
| 648. |
The clock shown in figure has a frequency of 6 MHz. The frequency of the Q output will be |
| A. | 12 MHz |
| B. | 24 MHz |
| C. | 3 MHz |
| D. | 1.5 MHz |
| Answer» D. 1.5 MHz | |
| 649. |
How many interrupts are there of 8085 μP? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 650. |
The hexadecimal number 'A0' has the decimal value |
| A. | 80 |
| B. | 256 |
| C. | 100 |
| D. | 160 |
| Answer» E. | |