MCQ in Electronic Systems and Design Part 9 | ECE Board Exam

This is the Multiple Choice Questions in Electronic Systems and Design Part 9 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 9 of the Series

Choose the letter of the best answer in each questions.

401. One of the most widely used forms of light sensor is the photodiode. Which of the following statements is correct?

A. A photodiode is an example of a photoconductive sensor.

B. A photodiode is an example of a photovoltaic sensor.

C. A photodiode can be used as either a photoconductive or a photovoltaic sensor.

D. None of these.

402. Inductive sensors are also known as______sensor.

A. eddy voltage

B. pierre current

C. eddy current

D. pierre voltage

403. The development of a DC voltage between two regions of a photoconductive semiconductor when one of the regions is illuminated by diffusion of an optically generated hole and electron pairs away from the illuminated region.

A. Destriau effect

B. Isotope effect

C. Dember effect

D. Hawks effect

404. What is the other term for thermoelectric effect?

A. Seebeck effect

B. Hall effect

C. Photoelectric effect

D. Thermal effect

405. The fastest and most sensitive photodiode available is the

A. avalanche photodiode

B. PIN diode

C. photo-Darlington

D. germanium photodiode

406. A transduction principle used primarily in optical sensors.

A. Photoconductive transduction

B. Photovoltaic transduction

C. Electromagnetic transduction

D. Piezoelectric transduction

407. Which of the following transducer is preferred for measurement involving sound?

A. piezoelectric pickup

B. thermocouple

C. photo-emessive cell

D. all of these

408. Germanium photodiodes have dark currents typically of the order of _______mA.

A. 10

B. 15

C. 20

D. 25

409. Process in industrial electronics where electrons are emitted from the surface of certain metals when expose to the light is called

A. photonics

B. photosensitive

C. phoovoltaic

D. photoemission

410. What type of bias is required for an LED to produce luminescence?

A. Reverse bias

B. Forward bias

C. Zero bias

D. Inductive bias

411. An SCR whose state is controlled by the light falling upon a silicon semiconductor layer of the device.

A. SCS

B. GTO

C. Thyristor

D. LASCR

412. It is used to measure along one axis and is insensitive to orthogonal directions

A. Tachometer

B. Potentiometer

C. Accelerometers

D. Speedometer

413. The value of dark-current of a photoconductive cell is

A. negligibly small

B. very high

C. zero

D. high

414. What are the solid state gallium arsenide devices that emit beam of radiant flux when forward biased?

A. LEDs

B. Photoconductive cells

C. IR emitters

D. Photodiodes

415. What device measures humidity directly with a single sensing element?

A. UJT

B. Tachometer

C. Venturi meter

D. Hydrometer

416. It is used in counting applications

A. Ultrasonic sensors

B. Photogates

C. proximity sensor

D. magnetic sensor

417. The smallest change it can detect in the quantity that it is measuring.

A. sensitivity

B. resolution

C. precision

D. range

418. The major advantage of a phototransistor as compared to a photodiode is its

A. Response to higher frequencies

B. AC operation

C. Increased sensitivity

D. Durability

419. What is the typical operating current of an LED?

A. 50 mA

B. 10 mA

C. 20 mA

D. 5 mA

420. Temperature range of RTD thermistor

A. -45°C – 150°C

B. -65°C – 170°C

C. -25°C – 120°C

D. -85°C – 190°C

421. Converts pressure changes into electrical form.

A. piezoelectric crystal

B. microphone

C. speaker

D. tactile transducer

422. LEDs are made out of

A. silicon.

B. germanium.

C. gallium.

D. silicon and germanium, but not gallium.

423. What is the normal operating voltage and current for a light-emitting diode?

A. 60 volts and 20 mA

B. 5 volts and 50 mA

C. 1.7 volts and 20 mA

D. 0.7 volts and 60 mA

424. A law states that there is a transition temperature at which ferromagnetic materials exhibit paramagnetic behavior.

A. Curie-Weiss Law

B. Amperes’s Law

C. Faraday’s Law of Induction

D. Ohm’s Law

425. What is the typical power range of thermocouple sensors

A. 0.1 mW to 100 W

B. 0.1 µW to 100 mW

C. 0.1 nW to 100 µW

D. 0.1 pW to 100 nW

426. The minimum magnitude of input signal required to produce a specified output signal having a specified signal-to-noise ratio.

A. sensitivity

B. precision

C. accuracy

D. resolution

427. What sensor provides a change of resistance with typical power range of 1µW to 10mW and with maximum frequency greater than 100GHz?

A. Thermal converter

B. Diode sensor

C. Thermocouple sensor

D. Thermistor sensor

428. In a phototransistor, base current is

A. set by bias voltage

B. directly proportional to light

C. inversely proportional to light

D. not a factor

429. The average energy of an atom at room temperature.

A. 6.3 x 10^-21 J

B. 3.6 x 10^-21 J

C. 6.3 x 10^-22 J

D. 3.6 x 10^-22 J

430. The process of emitting photons from a semiconductive material is called

A. photoluminescence.

B. gallium arsenide.

C. electroluminescence.

D. gallium phosphide.

431. Discovered piezoelectric effect in quartz crystal.

A. Marie Currie

B. Pierre Currie

C. Michael Faraday

D. Nikola Tesla

432. A displacement sensor that can be angular or linear.

A. ammeter

B. voltmeter

C. multimeter

D. potentiometer

433. A measure of how straight the line is when the target position is plotted against the driver’s output.

A. proportionality

B. equation of a line

C. exponentially

D. linearity

434. What is the approximate voltage drop of LED?

A. 0.3 V

B. 0.7 V

C. 1.5 V

D. 3.8 V

435. What semiconductor material is used in the construction of LED?

A. Silicon

B. Germanium

C. Gallium

D. Gallium arsenide

436. When light strikes certain semiconductor materials, the resistance of the material decreases

A. lightning effect

B. Photoconductive Effect

C. faraday effect

D. Currie effect

437. A coil resist a change in magnetic field by generating an opposing voltage/current

A. Curie-Weiss Law

B. Amperes’s Law

C. Faraday’s Law of Induction

D. Lenz Law

438. The basic principle of optoelectronic device is

A. to free electrons from matter

B. to provide electrons to matter

C. interaction of photon with matter

D. bombarding of electrons on matter

439. A ________ is a light-sensitive device whose number of free electrons generated is proportional to the intensity of the incident light.

A. Varicap

B. Photodiode

C. Schottky diode

D. LED

440. . What diode gives off light when energized?

A. Photodiode

B. LED

C. Photoconductive cell

D. Tunnel diode

441. The final result of the accumulated error sources that exist in any measurement system.

A. sensitivity

B. efficiency

C. accuracy

D. precision

442. Characterizes the degree of mutual agreement among a series of individual measurements.

A. sensitivity

B. accuracy

C. precision

D. resolution

443. The elastic scattering of photons by electron. Since the total energy and total momentum are conserved in the collisions, the wavelength of the scattered radiation is changed by an amount that depends on the angle of scattering, and part of the photon energy is transferred to electrons. This effect is called

A. Compton effect

B. Hall effect

C. Malter effect

D. Thomson effect

444. An artificial olfaction device with an array of chemical gas sensors, a sampling system, and a system with a pattern-classification algorithm used for analysis of gases, vapors, or odors.

A. e-nose

B. scent sensor

C. multi-gas sensor

D. aroma sensor

445. A transduction principle used primarily in optical sensors.

A. Photoconductive transduction

B. Photovoltaic transduction

C. Electromagnetic transduction

D. Piezoelectric transduction

446. The electric charge of a single electron

A. -1.6 x 10^-17

B. -6.1 x 10^-19

C. -1.6 x 10^-19

D. -6.1 x 10^-17

447. An LED is forward-biased. The diode should be on, but no light is showing. A possible trouble might be

A. the diode is open.

B. the series resistor is too small.

C. none. The diode should be off if forward-biased.

D. the power supply voltage is too high.

448. Temperature range of RTD

A. -166°C – 452°C

B. -176°C – 462°C

C. -186°C – 472°C

D. -196°C – 482°C

449. A law states that a current carrying conductor in a magnetic field experiences a force

A. Amperes’s Law

B. Lenz Law

C. Faraday’s Law

D. Curie-Weiss Law

450. Measure of closeness on reading a measurement to a standard value

A. accuracy

B. precision

C. sensitivity

D. resolution

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