206. The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase in

1. 1. freezing range

   
   
   

   2. viscosity

   
   
   

   3. degree of superheat

   
   
   

   4. surface tension

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

207. Match the following sand mold casting effects with their respective causes.
     

1. 1. P-3, Q-4, R-1, S-2

   
   
   

   2. P-3, Q-4, R-2, S-1

   
   
   

   3. P-4, Q-3, R-1, S-2

   
   
   

   4. P-2, Q-4, R-1, S-3

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

208. The hot tearing in a metal casting is due to

1. 1. high fluidity

   
   
   

   2. high melt temperature

   
   
   

   3. wide range of solidification temperature

   
   
   

   4. low coefficient of thermal expansion

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

209. Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known -as

1. 1. cold shut

   
   
   

   2. swell

   
   
   

   3. sand wash

   
   
   

   4. scab

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---

210. Misrun is a casting defect which occurs due to

1. 1. very high pouring temperature of the metal

   
   
   

   2. insufficient fluidity of the molten metal

   
   
   

   3. absorption of gases by the liquid metal

   
   
   

   4. improper alignment of the mould flasks

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---