This set of Metal Casting Multiple Choice Questions & Answers (MCQs) focuses on “Processing of Thermosetting Plastics”.
1. What is the minimum pressure required in a compression molding process?
a) 0.5 MPa
b) 1 MPa
c) 1.5 MPa
d) 2 MPa
View Answer
Explanation: Processing of thermosetting plastics is classified as, compression molding and transfer molding. The minimum pressure that is required for the complete operation of compression molding is 0.5 MPa.
2. What is the minimum temperature required in a compression molding process?
a) 120°C
b) 125°C
c) 130°C
d) 135°C
View Answer
Explanation: None.
3. What is the maximum pressure required in a compression molding process?
a) 35 MPa
b) 40 MPa
c) 45 MPa
d) 50 MPa
View Answer
Explanation: The maximum pressure that is required for the complete operation of compression molding is 50 MPa.
4. What is the maximum temperature required in a compression molding process?
a) 240°C
b) 245°C
c) 250°C
d) 255°C
View Answer
Explanation: Processing of thermosetting plastics is classified as, compression molding and transfer molding. The maximum temperature that is required for the complete operation of compression molding is 250°C.
5. In compression molding, the curing time does not depend on which of the following factors?
a) Material
b) Curing temperature
c) Geometry
d) Thickness
View Answer
Explanation: When there has to be molding done for thermosetting materials, mainly compression molding is preferred. While doing this, curing has to be done. The time needed for curing depends on the material used, geometry and thickness of the material.
6. What is the maximum curing time required in a compression molding process?
a) 2 minutes
b) 3 minutes
c) 4 minutes
d) 5 minutes
View Answer
Explanation: The maximum curing time that is required for the complete operation of compression molding is 5 minutes.
7. What is the minimum curing time required in a compression molding process?
a) 0.4 minutes
b) 0.5 minutes
c) 0.6 minutes
d) 0.7 minutes
View Answer
Explanation: The minimum curing time that is required for the complete operation of compression molding is 0.5 minutes.
8. What is the maximum pressure required in a transfer molding process?
a) 80 MPa
b) 90 MPa
c) 100 MPa
d) 120 MPa
View Answer
Explanation: Processing of thermosetting plastics is classified as, compression molding and transfer molding. The maximum pressure that is required for the complete operation of transfer molding is 100 MPa.
9. What is the minimum pressure required in a transfer molding process?
a) 20 MPa
b) 40 MPa
c) 50 MPa
d) 70 MPa
View Answer
Explanation: The maximum pressure that is required for the complete operation of transfer molding is 20 MPa.
10. Speed of production in transfer molding is higher than that of compression molding?
a) True
b) False
View Answer
Explanation: It is counted among one of the advantages of transfer molding over compression molding that the speed of production is quite higher. Not just that, but the maintenance in transfer molding too is lower than compression molding.
Sanfoundry Global Education & Learning Series – Metal Casting, Forming and Welding.
Practice 1000+ Multiple Choice Questions and Answers on Metal Casting and Metal Forming and Welding.
