MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Phase Transformation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
General coarseness of the microstructure (Melt) is largely determined by the _______ |
| A. | Grain size of base metal |
| B. | Composition of base metal |
| C. | Texture |
| D. | Nothing can be said |
| Answer» B. Composition of base metal | |
| 2. |
Wire diameters in the Gas metal arc welding ranges from _______ |
| A. | 0.5-0.8cm |
| B. | 1-3m |
| C. | 1-4mm |
| D. | 0.65-0.8mm |
| Answer» E. | |
| 3. |
How much impact does a nucleation barrier can create to the solidification when melt has approximately the same composition as the base metal, wetting of the base metal is very efficient? |
| A. | It can increase the undercooling |
| B. | It can decrease the rate of undercooling |
| C. | It can melt the base metal |
| D. | No major effect |
| Answer» E. | |
| 4. |
In general dendritic and cellular substructures in welds tend to be on a finer scale than in casting. |
| A. | False |
| B. | True |
| Answer» C. | |
| 5. |
Calculate the heat density if the power transferred is 1000W and the corresponding surface area is 10m2? |
| A. | 100 |
| B. | 10 |
| C. | 1 |
| D. | 1000 |
| Answer» B. 10 | |
| 6. |
Which among the following is the first automated arc welding process? |
| A. | TIG |
| B. | Submerged arc welding |
| C. | Plasma arc welding |
| D. | Resistance arc process |
| Answer» C. Plasma arc welding | |
| 7. |
Plasma arc welding is a special form of ____ |
| A. | TIG welding |
| B. | Electron beam welding |
| C. | Resistance welding |
| D. | Submerged arc welding |
| Answer» B. Electron beam welding | |
| 8. |
Typical shielding gases in TIG welding includes ______ |
| A. | Helium |
| B. | Carbon |
| C. | Oxygen |
| D. | Methane |
| Answer» B. Carbon | |
| 9. |
TIG welding of thin plates will give steeper thermal gradients than submerged arc welding of thick plates, the latter process will have the higher heat input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
An important effect of increasing the welding speed is that the shape of the weld pool changes from an elliptical shape to a ___________ |
| A. | Circular shape |
| B. | Pear shape |
| C. | Rectangular shape |
| D. | Broad shape |
| Answer» C. Rectangular shape | |
| 11. |
Welding can be considered as a ______ |
| A. | Dynamic process |
| B. | Static process |
| C. | Rapid process |
| D. | Explosive process |
| Answer» B. Static process | |
| 12. |
It is seen that for crystal growth rate, R, to keep pace with the welding speed, 3m/s, the condition must be met that for this to happen is____ (wetting angle 60 ) |
| A. | R = 1.5m/s |
| B. | R = 3m/s |
| C. | R = 0 |
| D. | R = 1.33m/s |
| Answer» B. R = 3m/s | |
| 13. |
The breakdown of solid/liquid interface at the local equilibrium can be due to___ |
| A. | Slow cooling |
| B. | Slow heating |
| C. | Rapid cooling |
| D. | Rapid heating |
| Answer» D. Rapid heating | |
| 14. |
Which among the following solidification can occur without microsegregation? |
| A. | Crystalline solidification |
| B. | Mixed solidification |
| C. | Partial solidification |
| D. | Revert solidification |
| Answer» B. Mixed solidification | |
| 15. |
Solidification can also occur at much higher rates of 104-107K/s. In which among the following it is not applicable? |
| A. | Liquid metal atomization |
| B. | Melt spinning |
| C. | Roller quenching |
| D. | Solidification of weld |
| Answer» E. | |