Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
! ! ! Set-4
ENGINE COOLING SYSTEMS
| Question | Answer |
|---|---|
| 1.The greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is a. carried out with the exhaust gases. b. converted into useful power. c. dissipated through the cylinder walls and heads. | a |
| 2.What is the purpose of an augmenter used in some reciprocating engine exhaust systems? a. To reduce exhaust back pressure. b. To aid in cooling the engine. c. To assist in displacing the exhaust gases. | b |
| 3.The purpose of an intercooler when used with a turbocharger is to cool the a. turbocharger bearings. b. exhaust gases before they come in contact with the turbo drive. c. air entering the carburetor from the turbocharger. | c |
| 4.Where are cooling fins usually located on air-cooled engines? a. Cylinder head, cylinder walls, and inside the piston. b. Cylinder head, cylinder barrel, and inside the piston. c. Exhaust side of the cylinder head, inside the pistons, and connecting rods. | b |
| 5.Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder? a. Too much cooling fin area broken off. b. A cracked cylinder baffle. c. Cowling air seal leakage. | a |
| 6.Generally, a small crack just started in a cylinder baffle a. requires repair by reinforcing, such as installation of a doubler over the area. b. may be stop drilled. c. requires no action unless it grows or is branched into two cracks. | b |
| 7. (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 high pressure area at the lower rear of the aircraft engine cowling. -- Regarding the above statements, a. only No. 2 is true. b. both No. 1 and No. 2 are true. c. only No. 1 is true. | c |
| 8.The component(s) in a turbine engine that operate(s) at the highest temperatures is/are the a. turbine disks. b. first stage turbine nozzle guide vanes. c. exhaust cone. | b |
| 9.Increased engine heat will cause volumetric efficiency to a. remain the same. b. increase. c. decrease. | c |
| 10.A broken cooling fin on a cylinder head a. should be left alone. b. is cause for rejection of the head. c. may be filed to smooth contours if damage and/or repair limits are not exceeded. | c |
| 11.Prolonged idling of an engine will usually result in a. foreign material buildup on spark plugs. b. increased oil consumption. c. excessive cylinder head temperatures. | a |
| 12.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. b. shrinking on a jacket or muff of aluminum cooling fins around a steel cylinder sleeve. c. machining fins directly on the outside of the barrel and shrinking on a jacket or muff of aluminum cooling fins around a steel cylinder sleeve (on different areas of the barrel). | a |
| 13.Reciprocating engines used in helicopters are cooled by a. blast tubes on either side of the engine mount. b. the downdraft from the main rotor. c. a fan mounted on the engine. | c |
| 14.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? a. Flap actuator motor. b. Flap actuator motor circuit breaker. c. Flap actuator control switch. | b |
| 15.Cylinder head temperatures are measured by means of an indicator and a a. resistance bulb sensing device. b. Thermocouple sensing device. c. Wheatstone bridge sensing device. | b |
| 16.Aircraft reciprocating engine cylinder baffles and deflectors should be repaired as required to prevent loss of a. cooling. b. fin area. c. power. | a |
| 17.Which of the following results in a decrease in volumetric efficiency? a. Cylinder head temperature too low. b. Part-throttle operation. c. Short intake pipes of large diameter. | b |
| 18.A bent cooling fin on an aluminum cylinder head a. should be sawed off and filed smooth. b. should be left alone if no crack has formed. c. should be stop drilled or a small radius filed at the point of the bend. | b |
| 19.What is the position of the cowl flaps during engine starting and warmup operations under normal conditions? a. Full open at all times. b. Full closed at all times. c. Open for starting, closed for warmup. | a |
| 20.What part of an air-cooled cylinder assembly has the greatest fin area per square inch? a. Rear of the cylinder head. b. Exhaust valve port. c. Cylinder barrel. | b |
| 21.What is the function of a blast tube as found on aircraft engines? a. A means of cooling the engine by utilizing the propeller backwash. b. A tube used to load a cartridge starter. c. A device to cool an engine accessory. | c |
| 22.Which of the following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly? a. An intercooler system. b. A baffle and cowl arrangement. c. An engine induction system. | b |
| 23.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 a. low RPM with oil dilution system activated. b. idle RPM. c. high RPM with mixture control in rich position. | b |
| 24.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? a. AC 43.13-1A. b. Engine structure repair manual. c. Engine manufacturer's service or overhaul manual. | c |
| 25.The position of the cowl flaps during normal cruise flight conditions is a. open. b. closed. c. one half open. | b |
Created by:
sampizzuto
Popular Aviation sets