FREE AVIATION AND STUDY GAMES ABOUT ENG. COOLING

PDF Download

FREE AVIATION AND STUDY GAMES ABOUT ENG. COOLING

SYS. EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -32 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: the greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is

Answer:

carried out with the exhaust Question 2: which statement is true regarding the air passing through the combustion section of a jet engine?

Answer:

most is used to engine cooling

Question 3: a broken cooling fin on a cylinder head

Answer:

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

Question 4: increased engine heat will cause volumetric efficiency to

Answer:

decrease

Question 5: aircraft reciprocating engine cylinder baffles and reflectors should be repaired as required to prevent loss of

Answer:

cooling

Question 6: prolonged idling of an engine will usually result in

Answer:

foreign material buildup on spark plugs

Question 7: generally, a small crack just started in a cylinder baffle

Answer:

may be stop drilled

Question 8: reciprocating engines used in helicopters are cooled by

Answer:

a fan mounted on the engine Question 9: 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

Answer:

machining fins directly on the outside of the barrel

Question 10: high cylinder head temperature are likely to result from

Answer:

a very lean mixture at high power settings.Question 11: what is the position of the cowl flaps during engine starting to warmup operations under normal conditions?

Answer:

full open at all times Question 12: the undersides of pistons are frequently finned. the principal reason is to

Answer:

provide for greater heat transfer to engine oil

Question 13: a bent cooling fin on an aluminum cylinder head should be

Answer:

left alone if no crack has formed

Question 14: cracks in cooling fins that do not extend into the cylinder head

Answer:

may be repaired by removing the affected area and contour filling within limits Question 15: the component(s) in a turbine engine that operate(s) at the highest temperature is/are the

Answer:

first stage turbine nozzle inlet guide vanes Question 16: (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

Answer:

Both are true Question 17: which of the following should a mechanic consult to determine the maximum amount of cylinder colling fin that could be removed when cracks are found?

Answer:

engine manufacturer's service pr pverhaul manual Question 18: the primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to

Answer:

force cooling air into close contact with all parts of the cylinders Question 19: cylinder head temperature are measured by means of an indicator and a

Answer:

thermocouple sensing device

Question 20: which of the following results in a decrease in volumetric efficiency?

Answer:

part-throttle operation Question 21: during an operational check of an electrically powered aircraft engine cowl flap system, the motor fails to operate. which of the following is the first to be checked?

Answer:

flap actuator motor circuit breaker Question 22: how do cowl flaps aid in cooling horizontally opposed aircraft engines?

Answer:

controls the amount of air flowing around the cylinders Question 23: which of the following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly?

Answer:

a baffle and cowl arrangment Question 24: What part of an air-cooled assembly has the greatest fin area per square inch?

Answer:

exhaust valve port

Question 25: where are cooling fins usually located on air-cooled engines?

Answer:

cylinder head, cylinder barrel, and inside the piston

Question 26: what is the function of a blast tube as found on aircraft engines?

Answer:

a device to cool an engine accessory Question 27: what is the purpose of an augmenter used in some reciprocating engine exhaust systems?

Answer:

to aid in cooling the engine