Engine Cooling Systems Flashcards
1
Q
- What is the most common means of regulating the cooling airflow through a reciprocating engine?
A
Cowl flaps
2
Q
- What is the purpose of the fins on engine cylinders?
A
Increase cooling surface
3
Q
- What other engine characteristics are designed to aid in engine cooling beside cooling fins?
A
Engine cowlings & baffles are design to force air through the cooling fins
4
Q
- Whey is the “open and close” adjustment during installation of cow flaps important?
A
Cowl flaps are set for tolerance to open & close in correct amounts
5
Q
- What should be done to cylinders when too much of the cooling fin area is broken off?
A
Replace cylinder
6
Q
- When should cowl flaps be kept in the fully open position?
A
During ground run operations
7
Q
- What publication should be referred to before re-profiling cylinder cooling fins?
A
Manufactures service manual or over haul manual
8
Q
- What power sources are used to operate the cowling flaps?
A
Electrical
Hydrualic
Manually
9
Q
- What is the purpose of blast tubes
A
Direct cool air to high heat areas
10
Q
- What are the main reasons that excessive heat in a reciprocating engine is undesirable?
A
Shortens life of engine, parts, impairs lubricaiton
11
Q
- Describe the augmented system
A
Helps keep temperature of air cooled engines down by using exhaust gas energy to draw cool air over engine
12
Q
- What is the source of air directed to engine bearings for cooling?
A
Bleed air from compressor
13
Q
- What is the purpose of insulation on the exhaust duct of a turbine engine?
A
Reduce temperature of the structures & to reduce oil and fuel contacting exhaust
14
Q
- What types of materials are used to make insulation blankets for turbine engines?
A
Stainless steel
Layers of aluminum foil
Fiber glass
Silver foil
15
Q
- What areas of a turbine engine are cooled by the secondary air passing though the engine?
A
Combustion chamber & turbine
