MCQ in Electronic Systems and Design Part 10 | ECE Board Exam

This is the Multiple Choice Questions in Electronic Systems and Design Part 10 of the Series as one of the Electronics Engineering Examination topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

MCQ Topic Outline included in ECE Board Exam Syllabi

6. Electronic Systems and Design

• MCQ in SCR’s, UJT, PUT, TRIAC, DIAC, and other Thyristors
• MCQ in Optoelectronic Devices and Sensors
• MCQ in Transducers, Data Acquisition, and Interfacing Techniques
• MCQ in Programmable Logic Controllers
• MCQ in Design and Integration in Building Management Systems and HVAC Controls,
  Security, Safety, and Surveillance Control Systems, and Audio-Video and Lighting
  Controls
• MCQ in Instrumentation and Control
• MCQ in Welding Systems
• MCQ in Robotic Principles
• MCQ in Bioelectrical Principles

Continue Practice Exam Test Questions Part 10 of the Series

Choose the letter of the best answer in each questions.

451. Sunlight corresponds to about

A. 30,000 lux

B. 50,000 lux

C. 40,000 lux

D. 60,000 lux

452. It is made up of two different metals joined at one end to produce a small voltage at a given temperature.

A. RTD

B. Thermistor

C. Thermocouples

D. Thermometer

453. What diode is used in seven-segment displays?

A. zener

B. LED

C. laser

D. Schottky

454. What is one of the most widely used sensing elements particularly for pressure ranges higher than 2 MPa?

A. Bellows

B. Bourdon tube

C. Capsule

D. Straight tube

455. What is also known as photodiffusion effect?

A. Dember effect

B. Skin effect

C. Destriau effect

D. Night effect

456. Sound waves emitted are in the range of

A. 2-13 MHz

B. 2-13 KHz

C. 2-15 MHz

D. 2-15 KHz

457. Which of the choices below is another name for a photoconductive cell?

A. Varicap

B. Varistor

C. Photoresistive device

D. Photodiode

458. Optocoupler is otherwise known as

A. Laser

B. Photodiodes

C. Optoisolator

D. Photoconductive cell

459. An LED and phototransistor is equivalent to a/an

A. Thermocouple

B. FET

C. Optocoupler

D. Regulator

460. What is the maximum current (rms) rating for commercially available LASCRs today?

A. 3 A

B. 15 A

C. 15 A

D. 25 A

461. It is also known as a solid state lamp which utilizes the fall of an electron from the conduction level to the valence level to develop an energy release in the form of heat or light.

A. LCD

B. PUT

C. Photodiode

D. Photoconductive cell

462. The specially designed semi-conductor diodes used as fast counters in electronic circuits are

A. Light emitting diodes

B. Photo diodes

C. Photo voltaic cell

D. Solar cells

463. Converts electrical power into visible light.

A. cathode ray tube

B. fluorescent lamp

C. photocell

D. antenna

464. Basic heat sensor

A. thermostat

B. radiator

C. thermistor

D. terminator

465. The common material of light dependent resistor (LDR) is

A. nickel cadmium

B. silicon

C. tungsten

D. Cadmium Sulphide

466. What is the effect of light in a photodiode?

A. Reverse current

B. Limits flow of current

C. Forwards current

D. Renders unstable current

467. The value of Planck’s constant

A. 6.36 x 10^-34 J

B. 3.66 x 10^-34 J

C. 3.63 x 10^-34 J

D. 6.63 x 10^-34 J

468. Light dependent resistor is type of

A. photo-voltaic device

B. photo-emissive device

C. photo-resistive device

D. photo-conductive device

469. In a forward-biased photo diode with increase in incident light intensity, the diode current:

A. Increases

B. Remains constant

C. Decreases

D. None of these

470. What happens to the photoconductive material when light strikes on it?

A. The conductivity of the material decreases

B. Nothing important happens

C. The conductivity of the material stays the same

D. The conductivity of the material increases

471. What is a typical light-to-dark resistance ratio for photocell?

A. 1:1000

B. 1:2000

C. 1:10000

D. 1:20000

472. Provides an analog output signal which id proportional to the variation in acoustic pressure acting upon a flexible diaphragm.

A. microphone

B. transducer

C. speaker

D. none of these

473. It is used for position measurements

A. Ultrasonic sensors

B. Photogates

C. proximity sensor

D. magnetic sensor

474. Which of the following photocell is most sensitive to?

A. Radio waves

B. Sound waves

C. Light waves

D. Heat waves

475. An opto-isolator contains _______.

A. an infrared LED

B. a photodetector

C. both an infrared LED and a photodetector

D. None of these

476. The span of input physical signals that may be converted to electrical signal by the sensor.

A. dynamic range

B. static range

C. signal span

D. life span

477. A measure of the ability of an LED to produce the desired number of lumens generated per applied watt of electrical energy.

A. Luminous intensity

B. Luminous efficiency

C. Luminous efficacy

D. Luminous ability

478. Optocoupler is otherwise known as

A. Laser

B. Photodiodes

C. Optoisolator

D. Photoconductive cell

479. The _________ as fundamental particle is considered as a bundle of radiant energy or light, the amount energy being related to the frequency.

A. Protons

B. LED

C. Photons

D. Comet

480. What is also known as photodiffusion effect?

A. Dember effect

B. Skin effect

C. Destriau effect

D. Night effect

481. Those substances which change their electrical resistance when illuminated by light are known as

A. photoconductive

B. photo emissive

C. photo voltaic

D. photomultiplier

482. What sensor provides a dc voltage approximately 1 V at 10 mW?

A. Diode sensor

B. Thermocouple sensor

C. Thermal sensor

D. Thermistor sensor

483. The minimum detectable signal fluctuation.

A. resolution

B. bias

C. degree

D. scale

484. Potentiometers are examples of

A. Passive transducers

B. Electromechanical transducers

C. Electromagnetic transducers

D. Active transducers

485. The most widely used light source in fiber-optic systems is the

A. gallium arsenide LED

B. incandescent lamp

C. indium phosphide LED

D. injection laser

486. The especially designed semiconductor diodes used as indicator lamps in electronic circuits are

A. switch

B. light emitting diode

C. photo diode

D. Solar cells

487. Photoconductive effect means.

A. The decreased conductivity of an illuminated semiconductor junction

B. The increased conductivity of an illuminated semiconductor junction

C. The conversion of photonic energy to electromagnetic energy

D. The conversion of an electromagnetic energy to photonic energy

488. Which of the following light sources cannot be used in fiber-optic systems?

A. semiconductor laser

B. gallium arsenide LED

C. incandescent lamp

D. indium phosphide LED

489. Simple sensors that work by using a circuit.

A. light sensor

B. shaft encoder

C. switch

D. sound sensor

490. Simply provide an on off output to indicate whether or not the target is present in front of the probe.

A. proximity switch

B. sensor

C. on-off switch

D. switch

491. A photodiode which conducts current only when forward biased and is exposed to light.

A. LAD

B. LED

C. PIN

D. Photoconductor

492. What semiconductor device produces electrical energy when exposed to light?

A. Photoelectronic cell

B. Photovoltaic cell

C. Photoelectric cell

D. Optoelectronic device

493. What is the most commonly used color of an LED?

A. Orange

B. Blue

C. Red

D. Green

494. The isolation resistance between the input and output of an optocoupler is

A. low

B. very low

C. high

D. very high

495. Measures apparent brightness (power multiplied by the human eye’s sensitivity).

A. lumen

B. intensity

C. lux

D. none of these

496. A laser diode normally emits

A. coherent light.

B. monochromatic light.

C. coherent and monochromatic light.

D. neither coherent nor monochromatic light.

497. The ratio between the small change in electrical signal to a small change in physical signal.

A. accuracy

B. linearity

C. sensitivity

D. resolution

498. Discovered piezoelectric effect in quartz crystal.

A. Marie Currie

B. Pierre Currie

C. Michael Faraday

D. Nikola Tesla

499. An LED and phototransistor is equivalent to a/an

A. Thermocouple

B. FET

C. Optocoupler

D. Regulator

500. Control system that maintains a speed voltage, or other variable within specified limits of a preset level.

A. Controller

B. Regulator

C. Sensor

D. Computer

Questions and Answers in Electronic Systems and Design

Following is the list of multiple choice questions in this brand new series:

Complete List of MCQ in Electronics Engineering per topic