Casting, Forming and Welding Multiple Choice Questions & Answers (MCQs) on “Testing Of Core Sands”.
1. With an increase in volume of air passed, what change is seen in the permeable number?
a) Increases
b) Decreases
c) No change occurs
d) No relation among the two
Answer: a
Clarification: With an increase in the volume of air passed, there is an increase in the permeable number, since the two have a direct relation.
2. With an increase in height of the specimen, what change is seen in the permeable number?
a) Increases
b) Decreases
c) No change occurs
d) No relation among the two
Answer: a
Clarification: With an increase in the height of the specimen, there is an increase in the permeable number, since the two have a direct relation.
3. With an increase in volume of air passed, what change is seen in the air pressure measurement?
a) Increases
b) Decreases
c) No change occurs
d) No relation among the two
Answer: a
Clarification: None.
4. With an increase in the height of the specimen, what change is seen in the air pressure measurement?
a) Increases
b) Decreases
c) No change occurs
d) No relation among the two
Answer: a
Clarification: None.
5. With an increase in area of the specimen, what change is seen in the permeability number?
a) Increases
b) Decreases
c) No change occurs
d) No relation among the two
Answer: b
Clarification: With an increase in the area of the specimen, there is a decrease in the permeability number, since the two have an inverse relation.
6. With an increase in air pressure measurement of the specimen, what change is seen in the permeability number?
a) Increases
b) Decreases
c) No change occurs
d) No relation between the two
Answer: b
Clarification: With an increase in the air pressure measurement of the specimen, there is a decrease in the permeability number, since the two have an inverse relation.
7. With an increase in air pressure measurement of the specimen, what change is seen in the air pressure measurement?
a) Increases
b) Decreases
c) No change occurs
d) No relation between the two
Answer: b
Clarification: None.
8. For baking standard core sand, the specimen needs to be heated at what temperature?
a) 800°F
b) 900°F
c) 1000°F
d) 1100°F
Answer: c
Clarification: The core sand has to be baked first and brought to a comparatively high temperature. For baking standard core sand, the specimen needs to be heated at about 1000°F and above it.
9. For how long is a specimen heated in a standard core above 1000°F?
a) 8-10 minutes
b) 10-12 minutes
c) 12-14 minutes
d) 14-16 minutes
Answer: b
Clarification: The core sand has to be baked first and brought to a comparatively high temperature. A standard core sand bake has to be heated above 1000°F for about 10 to 12 minutes.
10. Core hardness test includes testing of only baked cores.
a) True
b) False
Answer: b
Clarification: In the core hardness test, the hardness of both green cores as well as the baked cores are taken into consideration.