MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
Gibbs triangle is _______ |
| A. | An equilateral triangle |
| B. | An isosceles triangle |
| C. | A scalene triangle |
| D. | Right angled triangle |
| Answer» B. An isosceles triangle | |
| 2. |
Under what conditions three phases may coexist for some ternary system? |
| A. | Fixed pressure and temperature |
| B. | Fixed volume and pressure |
| C. | Fixed volume and temperature |
| D. | Fixed pressure and concentration |
| Answer» B. Fixed volume and pressure | |
| 3. |
A critical point at which liquid and vapor phase are identical is known as____ |
| A. | Bait point |
| B. | Gibbs point |
| C. | Plait point |
| D. | Lever point |
| Answer» D. Lever point | |
| 4. |
Which of the following can provide useful information about the formation of the reaction layer sequence when used together with the isothermal sections? |
| A. | Activity diagram |
| B. | Triangle rule |
| C. | Cooling curve |
| D. | Phase diagrams |
| Answer» B. Triangle rule | |
| 5. |
The Cu6Sn5 phase does not nucleate until below___________ |
| A. | 222 degree Celsius |
| B. | 275 degree Celsius |
| C. | 250 degree Celsius |
| D. | 300 degree Celsius |
| Answer» B. 275 degree Celsius | |
| 6. |
Which among the following cannot exist in local equilibrium with solder enriched with Bi at 200 degree Celsius? |
| A. | Cu<sub>6</sub>Sn<sub>5</sub> |
| B. | Cu<sub>3</sub>Sn |
| C. | Cu<sub>9</sub>Sn<sub>5</sub> |
| D. | CuSn<sub>7</sub> |
| Answer» D. CuSn<sub>7</sub> | |
| 7. |
Three-phase equilibrium in a ternary system exists _____ |
| A. | At a particular temperature |
| B. | Within a certain temperature range |
| C. | Over a wide range of temperature |
| D. | Not temperature dependent |
| Answer» C. Over a wide range of temperature | |
| 8. |
No two tie-lines at the same temperature may ever cross. |
| A. | False |
| B. | True |
| Answer» C. | |
| 9. |
Which of the following is true about the direction of tie-lines? |
| A. | They must run from liquidus to solidus |
| B. | They must run from solidus to liquidus |
| C. | They can run from solidus to liquidus and vice versa |
| D. | They have no specific direction |
| Answer» B. They must run from solidus to liquidus | |
| 10. |
The chemical potentials of A, B and C in any phase are then given by the points where the tangential plane to the free energy surfaces intersects the A, B and C axes in a Gibbs triangle.(Where A, B and C are individual components). |
| A. | False |
| B. | True |
| Answer» C. | |
| 11. |
The composition of a ternary alloy can be indicated on a ___________ |
| A. | Thomson s triangle |
| B. | Hershel s triangle |
| C. | Gibbs triangle |
| D. | Harley s triangle |
| Answer» D. Harley s triangle | |