Question

Match the following sand mould casting defects with their respective causes.

	Defect		Cause
P.	Blow hole	1.	Poor collapsibility
Q.	Misrun	2.	Mould erosion
R.	Hot tearing	3.	Poor permeability
S.	Wash	4.	Insufficient fluidity

• A. P-4, Q-3, R-1, S-2
• B. P-3, Q-4, R-2, S-1
• C. P-3, Q-4, R-1, S-2
• D. P-2, Q-4, R-1, S-3

Answer 1

The correct option is C P-3, Q-4, R-1, S-2

$\text{Blow holes}\to \text{Poor permeability}$

$\text{Misrun}\to \text{Insufficient fluidity}$

$\text{Hot tears}\to \text{Poor collapsibility}$

$\text{Wash}\to \text{Mould erosion}$