Recip- Cooling, etc

preheat the intake air

A method commonly used to prevent carburetor icing is to?

air temperatures between 30 and 40°F

Carburetor icing is most severe at

The airstream ahead of the carburetor

Into what part of a reciprocating engine induction system is deicing alcohol normally ejected?

a decrease in manifold pressure with a constant RPM

Carburetor icing on an engine equipped with a constant-speed propeller can be detected by

Carburetor

What part of an aircraft in flight witt begin to accumulate ice before any other?

Alcohol spray and heated induction air

Carburetor icing may be eliminated by which of the following methods?

None is required

Where would a carburetor air heater be located in a fuel injection system?

ice was forming in the carburetor

An increase in manifold pressure when carburetor heat is applied indicates

Carburetor air scoop

During full power output of an unsupercharged engine equipped with a float-type carburetor, in which of the following areas will the highest pressure exist?

a decrease in power and possibly detonation

The use of the carburetor air heater when it is not needed causes

density of air in the cylinder increases.

As manifold pressure increases in a reciprocating engine, the

It is possible to exceed 100 percent volumetric efficiency of some engines by the use of superchargers of the proper type.

Which of the following statements regarding volumetric efficiency of an engine is true?

a transient increase in engine power

Bootstrapping of a turbocharged engine is indicated by

Improper adjustment of carburetor heat valve control linkage.

Which of the following would be a factor in the failure of an engine to develop full power at takeoff?

all the exhaust gases are directed through the turbine.

If the turbocharger waste gate is completely closed,

30 "Hg.

Boost manifold pressure is generally considered to be any manifold pressure above

Limits the maximum manifold pressure that can be produced by the turbocharger at full throttle.

What is the purpose of the density controller in a turbocharger system?

Controls the rate at which the turbocharger discharge pressure will increase.

What is the purpose of the rate-of-change controller in a turbocharger systen?

Waste gate

What directly regulates the speed of a turbocharger?

Compresses air to maintain manifold pressure constant from sea level to the critical altitude of the engine.

What is the purpose of a turbocharger system for a small reciprocating aircraft engine?

Exhaust bypass assembly, density controller, and differential pressure controller.

What are the three basic regulating components of a sea-level boosted turbocharger system?

The differential pressure controller in a turbocharger system

upper deck pressure.

The pressure between the turbocharger and the throttle valve is called

It controls all positions of the waste gate except at fully open position./

Which of the following is a function of the differential pressure controller?

limit the amount of air that can flow from the turbocharger into the cabin for/ pressurization.

The purpose of a sonic venturi on a turbocharged engine is to

Gear train from the crankshaft.

What is used to drive a supercharger?

mixture will become richer.

If carburetor or induction system icing is not present when carburetor heat is applied with no change in the throttle setting, the

COLD.

When starting an engine equipped with a carburetor air heater, in what position hould the heater be placed?

decrease the weight of the fuel/air charge.

The application of carburetor heat during engine operation will

The mixture will become richer.

The application of carburetor heat will have which of the following effects?

Enriching the mixture until the AMC can make a compensation.

When operating an engine, the application of carburetor heat will have what effect on the air-fuel mixture?

silicon fouling of spark plugs.

In addition to causing accelerated wear, dust or sand ingested by a reciprocating engine may also cause

system will automatically allow warm, unfiltered air to be drawn into the engine.

In an airptane equipped with an alternate air system, if the main air duct air filter becomes blocked or clogged, the

Continue cranking the engine.

If a fire starts in the induction system during the engine starting procedure, what Should the operator do?

circulating the fuel and air mixture through passages in the oil sump.

On small aircraft engines, fuel vaporization may be increased by

increase the pressure of the incoming air by ram effect.

The action of a carburetor airscoop is to supply air to the carburetor, but it may Also

loss of power and possible detonation.

A carburetor air pre-heater is not generally used on takeoff unless absolutely necessary because of the

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

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

To aid in cooling the engine.

What is the purpose of an augmenter used in some reciprocating engine exhaust systems

cooling.

Aircraft reciprocating engine cylinder baffles and deflectors should be repaired as required to prevent loss of

maybe repaired by removing the affected area and contour filing within limits.

Cracks in cooling fins that do not extend into the cylinder head

Engine manufacturer's service or overhaul manual.

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?

left alone if no crack has formed.

A bent cooling fin on an aluminum cylinder head should be

Cylinder head, cylinder barrel, and inside the piston.

Where are cooling fins usually located on air-cooled engines?

Controls the amount of air flowing around the cylinders.

How do cowl flaps aid in cooling a horizontally opposed aircraft engine?

Closed

The position of the cowl flaps during normal cruise flight conditions is

may be stop drilled.

Generally, a small crack just started in a cylinder baffle

A baffle and cowl arrangement.

Which of the following assists in removing heat from the metal walts and fins of an air-cooled cylinder assembly?

Fully open.

During ground operation of an engine, the cowl flaps should be in what position?

Flap actuator motor circuit breaker.

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?

Augmenter systems are used to create a low-pressure area at the lower rear of the aircraft engine cowling.

Which of the following statements is true?

Too much cooling fin area broken off.

Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder?

Exhaust valve port.

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

a fan mounted on the engine.

Reciprocating engines used in helicopters are cooted by

carried out with the exhaust gases.

The greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is

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

A broken cooling fin on a cylinder head

idle RPM.

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

thermocouple sensing device.

Cylinder head temperatures are measured by means of an indicator and a

a very lean mixture at high power settings.

High cylinder head temperatures are likely to result from

air entering the carburetor from the turbocharger.

The purpose of an intercooler when used with a turbocharger is to cool the

foreign material buildup on spark plugs.

Prolonged idling of an engine will usually result in

machining fins directly on the outside of the barrel.

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 device to cool an engine accessory.

What is the function of a blast tube as found on aircraft engines?

Part-throttle operation.

Which of the following results in a decrease in volumetric efficiency?

provide for greater heat transfer to the engine oil.

The undersides of pistons are frequently finned. The principal reason is to

Full open at all times.

What is the position of the cowl flaps during engine starting and warmup operations under normal conditions?

decrease.

Increased engine heat will cause volumetric efficiency to

exhaust gases.

One source commonly used for carburetor air heat is

destroy vortices that can suck debris from the ground into engines that are mounted in pods that are low to the ground.

Using compressor bleed air directed into a nozzle, a vortex dissipater's primary function is to

both A and B are true.

If an engine air filter element is not routinely cleaned and becomes excessively dirty, it can cause

in the induction system or the exhaust system.

When a fireguard is standing by during an engine start, they should be watching for potential fires that could start

cause engine surges due to an erratic manifold pressure.

A malfunction that causes the turbocharger waste gate or controller to fluctuate will

Corrosion resistance and low expansion coefficient.

Why is high nicket chromium steel used in many exhaust systems?

spring loaded ball joints, slip joints, and bellows.

Reciprocating engine exhaust system designs commonly used to provide for ease of installation and/or allow for expansion and contraction may include the use of

It aids in alignment and absorbs expansion.

What is the purpose of a slip joint in an exhaust collector ring?

dissipate heat well.

Sodium-filled valves are advantageous to an aviation engine because they

Brass or heat-resistant nuts.

What type of nuts are used to hold an exhaust system to the cylinders?

is not recommended to be accomplished in the field.

Repair of exhaust system components

With the heater air shroud removed.

On an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat, how should the exhaust system be inspected?

By degreasing.

How should ceramic-coated exhaust components be cleaned?

The weld should taper off smoothly into the base metal.

Select a characteristic of a good weld on exhaust stacks.

By driving the crankshaft through suitable couplings.

How do the turbines which are driven by the exhaust gases of a turbo-compound engine contribute to total engine power output?

Use sand which has not previously been used on iron or steel.

How should corrosion-resistant steel parts such as exhaust collectors be blast cleaned?

velocity of the exhaust gases.

Power recovery turbines used on some reciprocating engines are driven by the

local hot spots.

Reciprocating engine exhaust systems that have repairs or sloppy weld beads which protrude internally are unacceptable because they cause

loose enough to permit some movement.

Ball joints in reciprocating engine exhaust systems should be

Lead pencil.

All of the following are recommended markers for reciprocating engine exhaust systems except

Exhaust.

Augmenter tubes are part of which reciprocating engine system?

excessive exhaust back pressure.

Dislodged internal muffler baffles on a small reciprocating engine may cause

To prevent dislodged muffler baffles from obstructing the muffler outlet.

What is the purpose of an exhaust outlet guard on a small reciprocating engine?

Pilot/passenger incapacitation caused by carbon monoxide entering the cabin.

What could be a result of undetected exhaust system leaks in a reciprocating engine powered airplane?

Signs of exhaust soot inside cowling and on adjacent components.

How may reciprocating engine exhaust system leaks be detected?

higher temperatures and higher pressures.

Compared to normally aspirated engines, turbocharged engine exhaust systems operate at

the high temperatures at which the exhaust system operates.

Most exhaust system failures result from thermal fatigue cracking in the areas of stress concentration. This condition is usually caused by