The main function of a riser is to maintain the escaping of gases from the casting during solidification.
  • a) True
  • b) False
Which of the following materials can have the negative volumetric shrinkage of the casting?
  • a) Aluminium
  • b) Steel
  • c) Zinc
  • d) Grey cast iron
There is no requirement of any risers for the casting of grey cast iron.
  • a) True
  • b) False
Improper risering has always resulted in the formation of voids inside the castings.
  • a) True
  • b) False
The cooling characteristics of casting can be represented by the_____
  • a) volume to surface area ratio
  • b) product of volume and surface area
  • c) surface area to volume ratio
  • d) surface area to perimeter ratio
Which of the following relations is given by chvorinov for the solidification time of a casting?
  • a) ts = k(V/SA)2
  • b) ts = k(V/SA)
  • c) ts = k(V*SA)2
  • d) ts = k(V/SA)3
A sphere can be used as a riser because of its freezing ratio, which is greater than unity.
  • a) True
  • b) False
Which of the following methods is used for the determination of optimum riser size?
  • a) RMS method
  • b) Modulus method
  • c) Finn method
  • d) Ring method
Which of the following factors is used to define the casting type in riser design?
  • a) Plating factor
  • b) Ranginess factor
  • c) Caine factor
  • d) Pseudo factor
The core material should be highly refractory in nature to avoid any damages to it.
  • a) True
  • b) False
In casting system, the riser is located at the lightest section to avoid any disturbance.
  • a) True
  • b) False
Which of the following parts is used as exothermic materials or insulators for the increase in efficiency of the riser?
  • a) Chills
  • b) Feeding aids
  • c) Biscuit
  • d) Filler
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