MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Assertion (A): Chills are used to reduce shrinkage porosity.Reason (R): the function of chill is to increase the rate of solidification in a critical region. |
| A. | Both A and R is correct, and R is a correct explanation for A |
| B. | Both A and R is correct, and R is an incorrect explanation for A |
| C. | A is wrong but R is correct |
| D. | A is correct but R is wrong |
| Answer» B. Both A and R is correct, and R is an incorrect explanation for A | |
| 2. |
Which one of the statements is not correct in metal casting? |
| A. | Rapid cooling produces a solidified skin or shell |
| B. | Those grain that have favourable orientation will grow preferentially |
| C. | Cast iron has wide mushy zones |
| D. | Lack of uniformity in grains size and distribution will cause anisotropic properties |
| Answer» D. Lack of uniformity in grains size and distribution will cause anisotropic properties | |
| 3. |
Dissolved gases may be removed from molten metal by? |
| A. | Flushing or purging with inert gas |
| B. | Melting and pouring the metal in vacuum |
| C. | Flushing or purging with inert gas or Melting and pouring the metal in vacuum |
| D. | Melting and pouring the metal in nitrogen atmosphere |
| Answer» D. Melting and pouring the metal in nitrogen atmosphere | |
| 4. |
Which one of the following expands during solidification? |
| A. | Mild steel |
| B. | Grey cast iron |
| C. | Aluminium |
| D. | Copper |
| Answer» C. Aluminium | |
| 5. |
According to Chvorinov s rule the solidification time is a function of volume and surface area and is given by the relationship between volume, area and some exponential power n . What is the value of n? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 6. |
If we decrease the freezing range, then the fluidity of metal will? |
| A. | Increase |
| B. | Decrease |
| C. | Will not change |
| D. | Initially increase and then decrease |
| Answer» B. Decrease | |