Multiple Choice Questions Topic Outline
- MCQs in Industrial Electronics
- MCQs in Electronic Control System
- MCQs in Industrial Solid State Services
- MCQs in Welding Systems
- MCQs in Thyristors
- MCQs in High Frequency Heating
- MCQs in Feedback Systems / Servomechanism
- MCQs in Transducers
- MCQs in Motor Speed Control Systems
- MCQs in Robotic Principles
- MCQs in Bioelectrical Principles
- MCQs in Instrumentation and Control
The Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part IV 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
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