 
			 
			MCQOPTIONS
 Saved Bookmarks
				| 1. | Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ C. | 
| A. | 250 | 
| B. | 650 | 
| C. | 850 | 
| D. | 1000 | 
| Answer» C. 850 | |