Engine Cooling Sys-Powerplant

1 (8814) - The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to

B- force cooling air into close contact with all parts of the cylinders.

2 (8815) - What is the purpose of an augmenter used in some reciprocating engine exhaust systems?

B- To aid in cooling the engine.

3 (8816) - Aircraft reciprocating engine cylinder baffles and deflectors should be repaired as required to prevent loss of

C- cooling.

4 (8817) - Cracks in cooling fins that do not extend into the cylinder head may be repaired by

B- removing affected area and contour filing within limits.

5 (8818) - Which of the following should a mechanic consult to determine the maximum amount of cylinder cooling fin that could be removed when cracks are found?

B- Engine manufacturer's service or overhaul manual.

6 (8819) - A bent cooling fin on an aluminum cylinder head

B- should be left alone if no crack has formed.

7 (8820) - Where are cooling fins usually located on air-cooled engines?

C- Cylinder head, cylinder barrel, and inside the piston.

8 (8821) - How do cowl flaps aid in cooling a horizontally opposed aircraft engine?

C- Controls the amount of air flowing around the cylinders.

9 (8822) - The position of the cowl flaps during normal cruise flight conditions is

A- closed.

10 (8823) - Generally, a small crack just started in a cylinder baffle

C- may be stop drilled.

11 (8824) - Which of the following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly?

B- A baffle and cowl arrangement.

12 (8825) - During ground operation of an engine, the cowl flaps should be in what position?

B- Fully open.

13 (8826) - The component(s) in a turbine engine that operate(s) at the highest temperatures is/are the

A- first stage turbine nozzle guide vanes.

14 (8827) - During an operational check of an electrically powered radial engine cowl flap system, the motor fails to operate. Which of the following is the first to be checked?

A- Flap actuator motor circuit breaker.

15 (8828) - (1) Some aircraft exhaust systems include an augmenter system to draw additional air over the engine for cooling.(2) Augmenter systems are used to create a low pressure area at the lower rear of the aircraft engine cowling.Regarding the above statements,

B- both No. 1 and No. 2 are true.

16 (8829) - Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder?

A- Too much cooling fin area broken off.

17 (8830) - What part of an air-cooled cylinder assembly has the greatest fin area per square inch?

C- Exhaust valve port.

18 (8831) - Reciprocating engines used in helicopters are cooled by

B- a fan mounted on the engine.

19 (8832) - The greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is

B- carried out with the exhaust gases.

20 (8833) - A broken cooling fin on a cylinder head

B- may be filed to smooth contours if damage and/or repair limits are not exceeded.

21 (8834) - An engine becomes overheated due to excessive taxiing or improper ground runup. Prior to shutdown, operation must continue until cylinders have cooled, by running engine at

B- idle RPM.

22 (8835) - Cylinder head temperatures are measured by means of an indicator and a

B- wheatstone bridge sensing device.

23 (8836) - High cylinder head temperatures are likely to result from

A- a very lean mixture at high power settings.

24 (8837) - The purpose of an intercooler when used with a turbocharger is to cool the

C- air entering the carburetor from the turbocharger.

25 (8838) - Prolonged idling of an engine will usually result in

C- foreign material buildup on spark plugs.

26 (8839) - The most common method and generally the best conduction of heat from the inside of a cylinder barrel to the cooling air is accomplished by

A- machining fins directly on the outside of the barrel.

27 (8840) - What is the function of a blast tube as found on aircraft engines?

C- A device to cool an engine accessory.

28 (8841) - Which statement is true regarding the air passing through the combustion section of a jet engine?

A- Most is used for engine cooling.

29 (8842) - Which of the following results in a decrease in volumetric efficiency?

B- Part-throttle operation.

30 (8843) - The undersides of pistons are frequently finned. The principal reason is to

B- provide for greater heat transfer to the engine oil.

31 (8844) - What is the position of the cowl flaps during engine starting and warmup operations under normal conditions?

A- Full open at all times.

32 (8845) - Increased engine heat will cause volumetric efficiency to

B- decrease.