MCQOPTIONS
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MCQOPTIONS
This section includes 303 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. |
Precision forging is a type of forging operation in which the metal stocks and dies are controlled very tightly. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 152. |
Which of the following defects occur at a lower temperature? |
| A. | undercut |
| B. | hot cracking |
| C. | cracking in weld metal |
| D. | cold cracking |
| Answer» E. | |
| 153. |
Which of the following defects occur due to scattering of metal around the vicinity of weld? |
| A. | undercut |
| B. | spatter |
| C. | cracking in weld metal |
| D. | cold cracking |
| Answer» C. cracking in weld metal | |
| 154. |
Which of the following defects occur due to incorrect welding techniques? |
| A. | undercut |
| B. | hot cracking |
| C. | cracking in weld metal |
| D. | cold cracking |
| Answer» D. cold cracking | |
| 155. |
Which of the following defects occur due to melting or burning away of base metal? |
| A. | undercut |
| B. | spatter |
| C. | cracking in weld metal |
| D. | cold cracking |
| Answer» B. spatter | |
| 156. |
Which of the following defects occur due to filler material having a different rate of contraction compared to parent metal? |
| A. | undercut |
| B. | spatter |
| C. | cracking in weld metal |
| D. | cold cracking |
| Answer» D. cold cracking | |
| 157. |
Which of the following defects occur due to the entrapment of gas bubbles by the freezing dendrites during the cooling of molten pad? |
| A. | inclusion of slag |
| B. | inadequate penetration |
| C. | incomplete fusion |
| D. | porosity |
| Answer» E. | |
| 158. |
Which of the following defects occur when weld metal layer fails to fuse together? |
| A. | inclusion of slag |
| B. | inadequate penetration |
| C. | incomplete fusion |
| D. | porosity |
| Answer» D. porosity | |
| 159. |
Which of the following defects occur when the deposited metal is not focused on the root of weld? |
| A. | inclusion of slag |
| B. | inadequate penetration |
| C. | incomplete fusion |
| D. | porosity |
| Answer» C. incomplete fusion | |
| 160. |
Which of the following defects occur due to flux employed and electrode coating? |
| A. | inclusion of slag |
| B. | inadequate penetration |
| C. | incomplete fusion |
| D. | porosity |
| Answer» B. inadequate penetration | |
| 161. |
In inertia friction welding, one workpiece is connected to |
| A. | flywheel |
| B. | the pin tool |
| C. | rotor |
| D. | generator |
| Answer» B. the pin tool | |
| 162. |
In inertia friction welding energy of welding machine is used. |
| A. | electrical |
| B. | potential |
| C. | rotational |
| D. | frictional |
| Answer» D. frictional | |
| 163. |
Which of the following holds true for friction welding? |
| A. | hazardous fumes are generated during the process |
| B. | argon is used as a shielding gas |
| C. | it is a power consuming process |
| D. | there are no solidification defects in the welded parts |
| Answer» E. | |
| 164. |
In direct drive friction welding, lower weld forces are generated. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 165. |
Weld strength in inertia friction welding is more than direct drive friction welding. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 166. |
Which of the following is not true about friction welding? |
| A. | dissimilar metals cannot be joined |
| B. | this technique is relatively faster as compared to the other techniques |
| C. | this technique is suitable for any parts of shape or size |
| D. | sheared surfaces can also be joined by the process |
| Answer» B. this technique is relatively faster as compared to the other techniques | |
| 167. |
Friction welding produces quality joints, with a 100% weld. |
| A. | lap joint |
| B. | tee-joint |
| C. | butt joint |
| D. | edge joint |
| Answer» D. edge joint | |
| 168. |
Friction welding is process. |
| A. | costly |
| B. | cost saving |
| C. | time consuming |
| D. | highly material selective |
| Answer» C. time consuming | |
| 169. |
All metallic engineering materials which are can be friction welded. |
| A. | soft |
| B. | weldable |
| C. | forgeable |
| D. | metamaterials |
| Answer» D. metamaterials | |
| 170. |
Upset butt welding is majorly used in the making of automobile parts. |
| A. | true |
| B. | false |
| Answer» C. | |
| 171. |
In friction welding process, materials are joined by motion between materials. |
| A. | rectilinear |
| B. | rubbing |
| C. | translatory |
| D. | brownian |
| Answer» C. translatory | |
| 172. |
What is the minimum power supply needed for the working of spot welding process? |
| A. | 10 kva |
| B. | 14 kva |
| C. | 6 kva |
| D. | 22 kva |
| Answer» B. 14 kva | |
| 173. |
What is the maximum power supply needed for the working of spot welding process? |
| A. | 135 kva |
| B. | 140 kva |
| C. | 145 kva |
| D. | 150 kva |
| Answer» E. | |
| 174. |
Which of the following method is not used in applying pressure in spot welding process? |
| A. | hand lever |
| B. | foot lever |
| C. | air pressure |
| D. | hydraulic cylinder |
| Answer» B. foot lever | |
| 175. |
Electrodes used in spot welding are made up of which material? |
| A. | only copper |
| B. | copper and tungsten |
| C. | copper and chromium |
| D. | copper and aluminium |
| Answer» E. | |
| 176. |
Which of the following can be easily be welded from flash butt welding process? |
| A. | tin |
| B. | lead |
| C. | cast irons |
| D. | carbon steel |
| Answer» E. | |
| 177. |
Which of the following process does not have high deposition rate? |
| A. | shielded metal arc welding |
| B. | electro slag welding |
| C. | gas-shielded metal arc welding |
| D. | flux core arc welding |
| Answer» B. electro slag welding | |
| 178. |
Which of the following is not correct about electro slag welding? |
| A. | high deposition rates |
| B. | welds flat or vertical joints only |
| C. | multiple electrodes may not be used |
| D. | complicated set-up |
| Answer» D. complicated set-up | |
| 179. |
What is the differentiating factor between flux core arc welding and gas-shielded metal arc welding processes? |
| A. | structure and chemical composition of electrode |
| B. | structure and chemical composition of metal plate |
| C. | time of welding |
| D. | process of welding |
| Answer» B. structure and chemical composition of metal plate | |
| 180. |
Which of the following welding process is preferred for field application? |
| A. | shielded metal arc welding |
| B. | submerged arc welding |
| C. | gas-shielded metal arc welding |
| D. | flux core arc welding |
| Answer» B. submerged arc welding | |
| 181. |
Which of the following is not correct about submerged arc welding? |
| A. | high deposition rate |
| B. | short set-up time |
| C. | high quality welds |
| D. | slag removal needed |
| Answer» C. high quality welds | |
| 182. |
Choose the correct option regarding metal- active gas welding? |
| A. | not suitable for thin metal sheets |
| B. | need to stop welding to change the consumed electrode |
| C. | equipment is not expensive |
| D. | high deposition rate |
| Answer» E. | |
| 183. |
Which of the following is true about flux core arc welding? |
| A. | low deposition rate |
| B. | cannot weld narrow angles |
| C. | slag removal required |
| D. | generates less volume of fumes and smoke. |
| Answer» D. generates less volume of fumes and smoke. | |
| 184. |
Which of the following is true about shielded metal arc welding? |
| A. | equipment cost is high |
| B. | cannot weld different types of metals |
| C. | cannot be used for metal sheets under 1.5mm thickness |
| D. | entire electrode can be used |
| Answer» D. entire electrode can be used | |
| 185. |
Why hydrogen not used excessively for welding? |
| A. | increases welding rate |
| B. | decreases welding rate |
| C. | destroys the metal plate |
| D. | affects the weld |
| Answer» E. | |
| 186. |
Which of the following can be non-low hydrogen process? |
| A. | shielded metal arc welding |
| B. | submerged arc welding |
| C. | gas-shielded metal arc welding |
| D. | flux core arc welding |
| Answer» B. submerged arc welding | |
| 187. |
Which of the following parameters control the quality of weld? |
| A. | composition of electrode |
| B. | size of electrode |
| C. | size of metal plate |
| D. | composition of metal plate |
| Answer» C. size of metal plate | |
| 188. |
In order to prevent oxidation and retain molten metal in stud welding which of the following is used? |
| A. | ceramic rings |
| B. | metal rings |
| C. | non-metal rings |
| D. | flux |
| Answer» B. metal rings | |
| 189. |
Which of the following gas welding process uses constant voltage? |
| A. | submerged arc welding |
| B. | tungsten inert gas welding |
| C. | stud welding |
| D. | gas metal arc welding |
| Answer» E. | |
| 190. |
If the total efficiency is 0.35 in arc welding. Then what is the welding speed in mm/sec if the cross-sectional area is 5mm2, welding power is 2 kW and the heat required in melting the metal is 100 J/mm3. |
| A. | 1.4 |
| B. | 14 |
| C. | 1400 |
| D. | 140 |
| Answer» B. 14 | |
| 191. |
The deflection of the arc in arc blow is by? |
| A. | electric field |
| B. | magnetic field |
| C. | combination of both |
| D. | hydrostatic field |
| Answer» C. combination of both | |
| 192. |
If the heat transfer efficiency is 0.5 and the melting efficiency is 0.6, then the overall efficiency will be? |
| A. | 0.83 |
| B. | 0.03 |
| C. | 0.30 |
| D. | 0.12 |
| Answer» D. 0.12 | |
| 193. |
In plasma arc welding the gas is? |
| A. | ionized |
| B. | heated |
| C. | magnetized |
| D. | vaporized |
| Answer» B. heated | |
| 194. |
What is the function of flux in submerged arc welding? |
| A. | to completely cover the welded zone |
| B. | to prevent oxidation of joint |
| C. | to prevent spattering of molten metal |
| D. | to prevent sticking of molten metal |
| Answer» E. | |
| 195. |
How does the arc voltage V depends upon the length of arc L? |
| A. | v = f(l) |
| B. | v = 1/f(l) |
| C. | v = f(l2) |
| D. | v = f(√l) |
| Answer» B. v = 1/f(l) | |
| 196. |
In which of the following gas welding process a non-consumable electrode is used? |
| A. | submerged arc welding |
| B. | tungsten inert gas welding |
| C. | stud welding |
| D. | gas metal arc welding |
| Answer» C. stud welding | |
| 197. |
4 MANUAL METAL ARC WELDING - GAS TUNGSTEN ARC WELDING - GAS METAL ARC WELDING - SUBMERGED ARC WELDING |
| A. | open circuit current |
| B. | closed circuit current |
| C. | short circuit current |
| D. | arc current |
| Answer» D. arc current | |
| 198. |
Amount of voltage required to generate the arc under no load condition is called? |
| A. | open circuit voltage |
| B. | closed circuit voltage |
| C. | short circuit voltage |
| D. | arc voltage |
| Answer» B. closed circuit voltage | |
| 199. |
The chemical formula of acetylene is? |
| A. | c2h4 |
| B. | c2h6 |
| C. | c2h5oh |
| D. | c2h2 |
| Answer» E. | |
| 200. |
The oxy acetylene gas welding is a type of? |
| A. | endothermic reaction |
| B. | exothermic reaction |
| C. | neutral reaction |
| D. | both endothermic reaction and exothermic reaction |
| Answer» C. neutral reaction | |