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

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

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

154. Electron tube equivalent to solid state SCR.

a. Triode

b. VTVM

c. CRT

d. Thyratron

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

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

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

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

a. UJT

b. PNP

c. SCR

d. NPN

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

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

a. Crowbar

b. Snubber

c. Varistor

d. Eliminator

161. A two-terminal, bidirectional thyristor.

a. DIAC

b. Shockley

c. TRIAC

d. Diode

162. A DIAC is equivalent to inverse parallel combination of

a. Shockley diodes

b. Schottky

c. BJT

d. SCR’s

163. A TRIAC is equivalent to inverse parallel combination of

a. Shockley

b. Schottky

c. BJT

d. SCR’s

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

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

a. BJT

b. DIAC

c. SCR

d. UJT

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

a. Forward breakover voltage

b. Trigger

c. Breakdown voltage

d. Peak voltage

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

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

169. Typical breakover voltage of an SBS.

a. 2 V

b. 4 V

c. 8 V

d. 16 V

170. The trigger current is applied to the…

a. Anode

b. Gate

c. Cathode

d. Base

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

172. The ratio of RB1 and RBB is called

a. Intrinsic standoff ratio

b. Reuber’s ratio

c. Common mode rejection ratio

d. Cat’s ratio

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

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

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

176. The time when electrode force is released.

a. Hold time

b. Squeeze time

c. Off period

d. Weld time

177. The fusion of the grain structure of materials.

a. Forge

b. Weld

c. Recombination

d. Coalescence

178. Time when current is applied to the workpiece.

a. Weld time

b. Squeeze time

c. Hold time

d. Off period

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

a. Time duration

b. Current

c. Electrical resistance

d. Pressure applied

180. Resistance welding machine component that holds the workpieces.

a. Electrical circuit

b. Electrode system

c. Mechanical system

d. None of the above

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

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

a. Control system

b. Electrical system

c. Electrode system

d. Mechanical system

183. Welder machine with capacities up to 500 kVa

a. Miniature welders

b. Rocker-arm welder

c. Press-type welder

d. Portable spot welder

184. Regulates the time of the welding cycle.

a. Electrode

b. Current regulator

c. Control system

d. Mechanical system

185. Welding machine use for large workpieces.

a. Miniature welders

b. Rocker-arm welder

c. Press-type welder

d. Portable spot welder

186. Another name for hammer welding

a. Fusion welding

b. RW

c. Maul welding

d. Forge welding

187. Referred to as a localized coalescence

a. Weld

b. Mold

c. Cast

d. Metal

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

189. The overlapped RSW.

a. RSEW (Resistance Seam Welding)

b. ORSW

c. OSW

d. USW

190. Spot welding are most commonly used in

a. Ships

b. Automobiles

c. Airplanes

d. Rafts

191. The last step in welding time control.

a. Off period

b. Weld time

c. Squeeze time

d. Hold time

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.

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

194. The year when resistance welding was discovered.

a. 1935

b. 1798

c. 1886

d. 1945

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

a. Coalition

b. Coincidence

c. Coalescense

d. Mixing

196. Arc welding requires a voltage around _________.

a. 60 – 100 V

b. 150 -200 V

c. 400 – 440 V

d. 1000 – 5000 V

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

a. 1 – 5 A

b. 5 – 50 A

c. 50 – 400 A

d. 500 – 4000 A

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

a. Gas welding

b. Spot welding

c. Induction welding

d. Arc welding

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

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

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