Casting Interview Questions and Answers for Experienced people on “Functions of Gating Systems”.
1. For the functioning of the gating system, which of the following factors need not be controlled?
a) Type of sprue
b) Size of runner
c) Temperature of molten metal
d) Type of riser
Answer: d
Clarification: For the most proper functioning of the gating system, all the above factors should be taken into considerations, but not the type of riser.
2. Sprues up to what diameters are round in section?
a) 10mm
b) 20mm
c) 30mm
d) 40mm
Answer: b
Clarification: Sprues up to a diameter of 20mm cross section are round in shape. Sprues required with a larger cross section are known to be rectangular in shape.
3. What prevents the liquid metal from entering the gate?
a) Gate basin
b) Sprue
c) Runner
d) Riser
Answer: a
Clarification: A gate basin plays a very vital role in stopping the liquid metal flow. A gate basin does not allow the turbulently flowing liquid metal to enter the gate.
4. When would dross and slag tend to float on the metal surface?
a) When pouring basins are doubled
b) When pouring basins are made large
c) When pouring basins are made small
d) When pouring basins are removed
Answer: b
Clarification: The metal could be stopped from entering the sprue, and would cause the dross and slag to float on the metal surface, when the pouring basins are made large.
5. Which of the following helps connecting runner and the mold cavity?
a) Sprue
b) Riser
c) Gate
d) Pouring cup
Answer: c
Clarification: One or more than one gates can be employed in the apparatus, as these gates are the links connecting the runner and the mold cavity.
6. Which of the following is not a type of a gate?
a) Top gate
b) Bottom gate
c) Parting gate
d) Middle gate
Answer: d
Clarification: Among the given types, middle gate is not a type of gate. Gates are classified into top, bottom and side gate only.
7. Which of the following gate is also called as ‘drop gate’?
a) Top gate
b) Bottom gate
c) Parting gate
d) Middle gate
Answer: a
Clarification: Top gate is also known by the name of drop gate. This is because the molten metal simply gets dropped down through this gate on the sand beneath.
8. Which of the following gates is used for making stove plate castings?
a) Edge gate
b) Wedge gate
c) Ring gate
d) Finger gate
Answer: b
Clarification: Among the following, edge gate, ring gate and finger gate, are not used for the making of stove plate castings. A wedge gate is used when a stove plate casting has to be made.
9. Which of the following gates is not favourble for non ferrous castings?
a) Top gate
b) Bottom gate
c) Parting gate
d) Middle gate
Answer: a
Clarification: When a non ferrous casting is made to drop from the top gate, there is a tendency of it to form dross. Hence, top gates are not favourable for non ferrous castings.
10. Ring gates retain slag.
a) True
b) False
Answer: a
Clarification: Ring gates hinder the fall of liquid with a core. These ring gates are observed to retain slag.
Casting for Interviews,