Chemical Engineering - Chemical Engineering Basics

21.
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
2
5
10
20
Answer: Option
Explanation:
No answer description is available. Let's discuss.

22.
Which set of materials is used as a moderator in nuclear reactor ?
Zircalloy & berrylium.
Zircalloy & heavy water.
Zirconium & berrylium.
Heavy water & berrelium.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

23.
Malleabilisation heat treatment is performed on
cast steel
grey cast iron
white cast iron
spheroidal graphite cast iron
Answer: Option
Explanation:
No answer description is available. Let's discuss.

24.
For hardening high alloy steel, it is to be heated slowly and uniformly to avoid
local hardening
scale formation
segregation
warpage
Answer: Option
Explanation:
No answer description is available. Let's discuss.

25.
Disposable patterns are made of
metal
polystyrene
rubber
wood
Answer: Option
Explanation:
No answer description is available. Let's discuss.