MCQOPTIONS
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MCQOPTIONS
This section includes 382 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
While machining insulating ceramic materials using EDM, where is the sheet metal placed? |
| A. | over material |
| B. | below material |
| C. | under material |
| D. | none of the mentioned |
| Answer» B. below material | |
| 152. |
Which path of the components in wire EDM determines the path to be machined? |
| A. | horizontal worktable movement |
| B. | vertical worktable movement |
| C. | horizontal & vertical worktable movement |
| D. | none of the mentioned |
| Answer» B. vertical worktable movement | |
| 153. |
Which of the following are the steps included in the die sinking process of EDM? |
| A. | cad of electrode |
| B. | electrode manufacturing |
| C. | programming for die sinking |
| D. | all of the mentioned |
| Answer» E. | |
| 154. |
3 to 10 µm when machined using Electro discharge sawing. |
| A. | 0.001 to 0.022 mm |
| B. | 0.025 to 0.130 mm |
| C. | 0.236 to 0.352 mm |
| D. | 0.432 to 0.568 mm |
| Answer» C. 0.236 to 0.352 mm | |
| 155. |
When compared to the conventional abrasive sawing, how many times faster is the MRR? |
| A. | twice |
| B. | thrice |
| C. | four |
| D. | five |
| Answer» B. thrice | |
| 156. |
Electro discharge sawing is an application of EDM which employs as tool material. |
| A. | steel band |
| B. | disc |
| C. | steel band & disc |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 157. |
10 to 0.50 mm. |
| A. | 0.01 to 0.05 mm |
| B. | 0.1 to 0.5 mm |
| C. | 1 to 5 mm |
| D. | 10 to 15 mm |
| Answer» B. 0.1 to 0.5 mm | |
| 158. |
State whether the following statement is true or false regarding the HAZ in EDM. “In EDM, post treatment to recover fatigue strength is not recommended.” |
| A. | true |
| B. | false |
| Answer» C. | |
| 159. |
Which of the following processes can be used for restoration of fatigue properties? |
| A. | low-stress grinding |
| B. | chemical machining |
| C. | reheat treatment |
| D. | all of the mentioned |
| Answer» E. | |
| 160. |
During finishing process through Electro discharge machining, what is the value thickness of layer formed? |
| A. | <0.075 mm |
| B. | <0.125 mm |
| C. | <0.500 mm |
| D. | <0.750 mm |
| Answer» B. <0.125 mm | |
| 161. |
During roughing process through Electro discharge machining, what is the thickness of layer formed? |
| A. | <0.075 mm |
| B. | <0.125 mm |
| C. | <0.500 mm |
| D. | <0.750 mm |
| Answer» C. <0.500 mm | |
| 162. |
The depth of the annealed surface is to the amount of power used in machining operation. |
| A. | directly proportional |
| B. | inversely proportional |
| C. | exponential |
| D. | all of the mentioned |
| Answer» B. inversely proportional | |
| 163. |
What is the value of thickness of recast layer obtained when power of 5 µJ is given? |
| A. | 1 µm |
| B. | 3 µm |
| C. | 5 µm |
| D. | 7 µm |
| Answer» B. 3 µm | |
| 164. |
How much extra tolerances are achieved when we choose proper variables? |
| A. | ± 5 mm |
| B. | ± 10 mm |
| C. | ± 15 mm |
| D. | ± 20 mm |
| Answer» B. ± 10 mm | |
| 165. |
Using of a mate electrode in Electro discharge machining the surface roughness of material. |
| A. | increases |
| B. | decreases |
| C. | enhances |
| D. | none of the mentioned |
| Answer» C. enhances | |
| 166. |
What happens to the crater size if we decrease the pulse time keeping the current constant? |
| A. | increase |
| B. | decrease |
| C. | increase and decrease |
| D. | none of the mentioned |
| Answer» C. increase and decrease | |
| 167. |
In Electro discharge machining, materials with low melting point have which type of surface roughness? |
| A. | rough |
| B. | smooth |
| C. | fine |
| D. | all of the mentioned |
| Answer» B. smooth | |
| 168. |
Which of the following factors influence the material removal rate? |
| A. | pulse condition |
| B. | electrode polarity |
| C. | machining medium |
| D. | all of the mentioned |
| Answer» E. | |
| 169. |
State whether the following statement is true or false regarding the dielectric in EDM. “In EDM, flushing through the tool is more preferred than side flushing.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| 170. |
Few large holes are than many small flushing holes in Electro discharge machining. |
| A. | worse |
| B. | better |
| C. | well |
| D. | none of the mentioned |
| Answer» B. better | |
| 171. |
Which methods below, are used for introducing the dielectric in machining gap? |
| A. | normal flow |
| B. | reverse flow |
| C. | jet flushing |
| D. | all of the mentioned |
| Answer» E. | |
| 172. |
In EDM, inadequate flushing will not result in which of the following consequences? |
| A. | arcing |
| B. | debris removal |
| C. | decrease electrode life |
| D. | increased production time |
| Answer» C. decrease electrode life | |
| 173. |
Which of the following can be used as dielectric fluids in EDM? |
| A. | kerosene |
| B. | silicon fluids |
| C. | distilled water |
| D. | all of the mentioned |
| Answer» E. | |
| 174. |
State whether the following statement is true or false regarding wear in EDM. “In EDM, corner wear ratio does not depend on type of electrode material.” |
| A. | true |
| B. | false |
| Answer» C. | |
| 175. |
State whether the following statement is true or false regarding wear in EDM. “In EDM, electrode wear is less dominant when it comes to micromachining applications.” |
| A. | true |
| B. | false |
| Answer» C. | |
| 176. |
Quality of hole produced by orbiting motion is to that obtained by using stationary electrode. |
| A. | inferior |
| B. | superior |
| C. | lower |
| D. | all of the mentioned |
| Answer» C. lower | |
| 177. |
Electrode orbiting the flushing of dielectric fluid in Electro discharge machining. |
| A. | improves |
| B. | decreases |
| C. | reduces |
| D. | degrades |
| Answer» B. decreases | |
| 178. |
Which of the following parameters determines the size of cavities? |
| A. | size of electrode |
| B. | radius of orbit |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 179. |
In addition to the feed of tool, Electro discharge machining tool can have which type of motion? |
| A. | oscillatory |
| B. | rotary |
| C. | vibrational |
| D. | all of the mentioned |
| Answer» C. vibrational | |
| 180. |
Brass metal ensures which type of sparking conditions in Electro discharge machining? |
| A. | stable |
| B. | unstable |
| C. | unsteady |
| D. | insecure |
| Answer» B. unstable | |
| 181. |
Copper has Electro discharge machining wear and conductivity. |
| A. | good, better |
| B. | good, worse |
| C. | bad, better |
| D. | bad, worse |
| Answer» B. good, worse | |
| 182. |
Metals with melting point and electrical conductivity are chosen as tools in EDM. |
| A. | low, good |
| B. | low, bad |
| C. | high, good |
| D. | high, bad |
| Answer» D. high, bad | |
| 183. |
Which of the following are main components of EDM? |
| A. | dielectric system |
| B. | servomechanism |
| C. | power supply |
| D. | all of the mentioned |
| Answer» E. | |
| 184. |
Which of the following pulses contribute to the desired material removal in EDM? |
| A. | open circuit pulses |
| B. | short circuits |
| C. | arcs |
| D. | sparks |
| Answer» E. | |
| 185. |
When the electrode gap is too small or electrodes are in contact, how much material is removed? |
| A. | 10% |
| B. | 20% |
| C. | 30% |
| D. | no material removed |
| Answer» E. | |
| 186. |
Which components mentioned below are affected due to arcs? |
| A. | work piece |
| B. | tool |
| C. | work piece & tool |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 187. |
The layer formed when un expelled molten metal solidifies is known as |
| A. | reabsorbed layer |
| B. | recast layer |
| C. | un evaporated layer |
| D. | condensed layer |
| Answer» C. un evaporated layer | |
| 188. |
At the end of pulse, super-heated metal evaporates |
| A. | explosively |
| B. | normally |
| C. | periodically |
| D. | occasionally |
| Answer» B. normally | |
| 189. |
What are the values of pressure of the plasma in EDM? |
| A. | up to 2 atm |
| B. | up to 20 atm |
| C. | up to 200 atm |
| D. | up to 2000 atm |
| Answer» D. up to 2000 atm | |
| 190. |
State whether the following statement is true or false about material removal in EDM. “In EDM, high pressures allow the metal to evaporate.” |
| A. | true |
| B. | false |
| Answer» C. | |
| 191. |
Which of the following mechanisms is used for material removal? |
| A. | electro discharge erosion |
| B. | magnetic abrasion |
| C. | electro chemical dissolution |
| D. | mechanical erosion |
| Answer» B. magnetic abrasion | |
| 192. |
State whether the following statement is true or false regarding EDM. “In EDM, process is affected by hardness of material.” |
| A. | true |
| B. | false |
| Answer» C. | |
| 193. |
In Micro-Ultrasonic Machining, which of the following component vibrates? |
| A. | tool |
| B. | work piece |
| C. | feed pipe |
| D. | all of the mentioned |
| Answer» C. feed pipe | |
| 194. |
Which one of the following factors affects the accuracy of parts? |
| A. | steady abrasive flow |
| B. | accurate feed |
| C. | unsteady abrasive flow |
| D. | ultrasonic frequency |
| Answer» D. ultrasonic frequency | |
| 195. |
Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 196. |
Which of the following can be used as an abrasive carrying medium? |
| A. | water |
| B. | benzene |
| C. | glycerol |
| D. | all of the mentioned |
| Answer» E. | |
| 197. |
If splashing occurs, it will result in an increase of material removal rate in USM. |
| A. | true |
| B. | false |
| Answer» C. | |
| 198. |
The machinability of USM depends on brittleness criterion. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 199. |
In the following mechanisms, which one is dominant in material removal? |
| A. | hammering |
| B. | cavitation |
| C. | microchipping |
| D. | none of the mentioned |
| Answer» B. cavitation | |
| 200. |
In USM, tool tips must have low resistance and fatigue strength. |
| A. | true |
| B. | false |
| Answer» C. | |