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# MCQ in Electronic Systems and Design Part 4 | ECE Board Exam

This is the Multiple Choice Questions in Electronic Systems and Design Part 4 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 4 of the Series

Choose the letter of the best answer in each questions.

151. This device is two zener diodes connected back to back in series and is used to support voltage surges and transients.

a. Thyristor

b. Varactor

c. Thyrector

d. Phanatron

Solution:

152. Refers to the number of degrees of an AC cycle during which the SCR is turned on.

a. Conduction angle

b. Firing delay angle

c. Induction angle

d. ON angle

Solution:

153. A four-element solid state device that combines the characteristics of a both diodes and transistors.

a. Varactor

b. Zener diode

c. Tunnel diode

d. SCR

Solution:

154. Electron tube equivalent to solid state SCR.

a. Triode

b. VTVM

c. CRT

d. Thyratron

Solution:

155. Find the two stable operating conditions of an SCR.

a. Conducting and non-conducting

b. Oscillating and quiescent

c. NPN conduction and PNP conduction

d. Forward conducting and reverse conducting

Solution:

156. How do you stop conduction during which SCR is also conducting?

a. Remove voltage gate

b. Increase cathode voltage

c. Interrupt anode current

d. Reduce gate current

Solution:

157. When an SCR is triggered or on conducting, its electrical characteristics are similar to what other solid-state device (as measured between its cathode and anode)?

a. The junction diode

b. The varactor diode

c. The tunnel diode

d. The hotcarrier diode

Solution:

158. Which of the following does not have a base terminal?

a. UJT

b. PNP

c. SCR

d. NPN

Solution:

159. A series RC circuit that is connected in parallel with an SCR to eliminate false triggering.

a. Crowbar

b. Snubber

c. Varistor

d. Eliminator

Solution:

160. A circuit that protects a sensitive circuit from a sudden increase in supply voltage.

a. Crowbar

b. Snubber

c. Varistor

d. Eliminator

Solution:

161. A two-terminal, bidirectional thyristor.

a. DIAC

b. Shockley

c. TRIAC

d. Diode

Solution:

162. A DIAC is equivalent to inverse parallel combination of

a. Shockley diodes

b. Schottky

c. BJT

d. SCRโs

Solution:

163. A TRIAC is equivalent to inverse parallel combination of

a. Shockley

b. Schottky

c. BJT

d. SCRโs

Solution:

164. Which are the three terminals of a TRIAC?

a. Gate, anode1 and anode2

b. Gate, source and sink

c. Base, emitter and collector

d. Emitter, base1 and base2

Solution:

165. Which device can be modeled by a diode and two resistors?

a. BJT

b. DIAC

c. SCR

d. UJT

Solution:

166. The minimum emitter to base 1 voltage to trigger the UJT.

a. Forward breakover voltage

b. Trigger

c. Breakdown voltage

d. Peak voltage

Solution:

167. The ratio of the emitter to base1 resistance to the interbase resistance of a UJT.

a. Aspect ratio

b. Current gain

c. Voltage gain

d. Intrinsic standoff ratio

Solution:

168. For UJT, it is the region between the peak and valley points.

a. Active region

b. Negative resistance region

c. Trigger region

d. Saturation region

Solution:

169. Typical breakover voltage of an SBS.

a. 2 V

b. 4 V

c. 8 V

d. 16 V

Solution:

170. The trigger current is applied to theโฆ

a. Anode

b. Gate

c. Cathode

d. Base

Solution:

171. The region where breakover voltage of the SBS drops to 1 V instantaneously.

a. Falldown region

b. Fallback region

c. Breakback region

d. Breakdown region

Solution:

172. The ratio of RB1 and RBB is called

a. Intrinsic standoff ratio

b. Reuberโs ratio

c. Common mode rejection ratio

d. Catโs ratio

Solution:

173. The time between the first application of electrode force and the first application of welding current.

a. Squeeze time

b. Weld time

c. Hold time

d. Off period

Solution:

174. Process wherein coalescence is produced by the heat obtained from the resistance of the workpiece to the flow of low voltage, high density electric current in a circuit.

a. Forge welding

b. Resistance welding

c. Ultrasonic welding

d. LBW

Solution:

175. Time when electrode force is applied but the current is shut off.

a. Off period

b. Hold time

c. Squeeze time

d. Weld time

Solution:

176. The time when electrode force is released.

a. Hold time

b. Squeeze time

c. Off period

d. Weld time

Solution:

177. The fusion of the grain structure of materials.

a. Forge

b. Weld

c. Recombination

d. Coalescence

Solution:

178. Time when current is applied to the workpiece.

a. Weld time

b. Squeeze time

c. Hold time

d. Off period

Solution:

179. Heat in resistance welding is produced by the following factors except one

a. Time duration

b. Current

c. Electrical resistance

d. Pressure applied

Solution:

180. Resistance welding machine component that holds the workpieces.

a. Electrical circuit

b. Electrode system

c. Mechanical system

d. None of the above

Solution:

181. Resistance spot welding (RSW) machine type that is controlled by hydraulic cylinders.

a. Miniature welders

b. Rocker-arm welder

c. Press-type welder

d. Portable spot welder

Solution:

182. Machine component made up of the transformer and the current regulator.

a. Control system

b. Electrical system

c. Electrode system

d. Mechanical system

Solution:

183. Welder machine with capacities up to 500 kVa

a. Miniature welders

b. Rocker-arm welder

c. Press-type welder

d. Portable spot welder

Solution:

184. Regulates the time of the welding cycle.

a. Electrode

b. Current regulator

c. Control system

d. Mechanical system

Solution:

185. Welding machine use for large workpieces.

a. Miniature welders

b. Rocker-arm welder

c. Press-type welder

d. Portable spot welder

Solution:

186. Another name for hammer welding

a. Fusion welding

b. RW

c. Maul welding

d. Forge welding

Solution:

187. Referred to as a localized coalescence

a. Weld

b. Mold

c. Cast

d. Metal

Solution:

188. Part of the welding electric circuit that is used to produce high amperage current at low voltages.

a. Capacitor

b. Voltage regulator

c. Transformer

d. The secondary circuit

Solution:

189. The overlapped RSW.

a. RSEW (Resistance Seam Welding)

b. ORSW

c. OSW

d. USW

Solution:

190. Spot welding are most commonly used in

a. Ships

b. Automobiles

c. Airplanes

d. Rafts

Solution:

191. The last step in welding time control.

a. Off period

b. Weld time

c. Squeeze time

d. Hold time

Solution:

192. The relative maximum workpiece thickness where spot welding can be used.

a. 0.5 in

b. 1 in.

c. 1.5 in.

d. 0.25 in.

Solution:

193. Resistance welding was developed by this man in and revolutionized the welding industry.

a. Isaac Asimov

b. Karel Capek

c. Thomas Seebeck

d. Elihu Thomson

Solution:

194. The year when resistance welding was discovered.

a. 1935

b. 1798

c. 1886

d. 1945

Solution:

195. It is the fusion or growing of the materials being together.

a. Coalition

b. Coincidence

c. Coalescense

d. Mixing

Solution:

196. Arc welding requires a voltage around _________.

a. 60 โ 100 V

b. 150 -200 V

c. 400 โ 440 V

d. 1000 โ 5000 V

Solution:

197. During arc welding, the current is in the range of _________.

a. 1 โ 5 A

b. 5 โ 50 A

c. 50 โ 400 A

d. 500 โ 4000 A

Solution:

198. The body structure of the car is welded by _________.

a. Gas welding

b. Spot welding

c. Induction welding

d. Arc welding

Solution:

199. For inspection of welding defects in thick metals, which of the following ray is used to photograph thick metals objects?

a. Gamma rays

b. Cosmic rays

c. Infrared rays

d. Ultraviolet rays

Solution:

200. The voltage across an SCR when it is turned on is about

a. 0.5 V

b. 0.1 V

c. 1 V

d. 5 V

Solution:

#### Questions and Answers in Electronic Systems and Design

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

MCQ in Electronic Systems and Design
PART 1: MCQ from Number 1 โ 50                         Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                    Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                  Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                  Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                  Answer key: PART 5
PART 6: MCQs from Number 251 โ 300                Answer key: PART 6
PART 7: MCQ from Number 301 โ 350                  Answer key: included
PART 8: MCQ from Number 351 โ 400                  Answer key: included
PART 9: MCQ from Number 401 โ 450                  Answer key: included
PART 10: MCQ from Number 451 โ 500                Answer key: included

### Complete List of MCQ in Electronics Engineering per topic

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