cooling

#1. The most efficient method for cooling a piston engine is to use_____________. However, the most common method of cooling is to use_________ because of the _________ involved.

• Aair cooling liquid cooling reduced costs
• Bliquid cooling air cooling reduced costs
• Cfuel cooled air cooling reduced costs
• Dliquid cooling fuel cooling reduced costs

#2. At take off Cowl flaps should be selected:

• AFully closed to decrease drag.
• BOpen
• CPartially closed
• DFully closed to increase drag.

#3. A typical piston engine has a maximum thermal efficiency of:

• A70%
• B80%
• C90%
• D30%