FAA RECIPROCATING ENGINE INDUCTION AND COOLING SYS 2

Cracks in cooling fins that do not extend into the cylinder head. should be left alone and monitored. may be repaired by removing the affected area and contour filing within limits. may be repaired by adding a stiffener.

A bent cooling fin on an aluminum cylinder head should be. sawed off and filed smooth. left alone if no crack has formed. straightened out as much as possible without breaking.

What directly regulates the speed of a turbocharger?. Turbine. Waste gate. Throttle.

If a turbocharger waste gate is not able to close fully,. the aircraft will not be able to reach its critical altitude. the engine is more likely to over boost. none of the exhaust gases will flow through the turbine.

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?. Flap actuator motor circuit breaker. Flap actuator control switch. Flap actuator motor.

High cylinder head temperatures are likely to result from. a very lean mixture at high power settings. fouled spark plugs. a very rich mixture at high power settings.

How do cowl flaps aid in cooling a horizontally opposed aircraft engine?. Recirculates air through the engine cylinders. Directs air through the engine cylinders. Controls the amount of air flowing around the cylinders.

What part of an aircraft in flight will begin to accumulate ice before any other?. Wing leading edge. Propeller spinner or dome. Carburetor.

Increased engine heat will cause volumetric efficiency to. remain the same. decrease. increase.

The undersides of pistons are frequently finned. The principal reason is to. provide sludge chambers and sediment traps. provide for greater heat transfer to the engine oil. support ring grooves and piston pins.

Boost manifold pressure is generally considered to be any manifold pressure above. 14.7 "Hg. 50 "Hg. 30 "Hg.

A method commonly used to prevent carburetor icing is to. preheat the intake air. mix alcohol with the fuel. electrically heat the throttle valve.

The purpose of a sonic venturi on a turbocharged engine is to. limit the amount of air that can flow from the turbocharger into the cabin for pressurization. increase the amount of air that can flow from the turbocharger into the cabin for pressurization. increase the velocity of the fuel/ air charge.

As manifold pressure increases in a reciprocating engine, the. volume of air in the cylinder increases. weight of the fuel/air charge decreases. density of air in the cylinder increases.

Which of the following statements regarding volumetric efficiency of an engine is true?. The volumetric efficiency of an engine will remain the same regardless of the amount of throttle opening. It is impossible to exceed 100 percent regardless of the hope of sypercharger used. It is possible to exceed 100 percent volumetric efficiency of some engines by the use of superchargers of the proper type.

Where would a carburetor air heater be located in a fuel injection system?. At the air intake entrance. None is required. Between the air intake and the venturi.

Carburetor icing is most severe at. air temperatures between 30 and 40°F. high altitudes. low engine temperatures.

Generally, a small crack just started in a cylinder baffle. requires repair by reinforcing, such as installation of a doubler over the area. requires no action unless it grows or is branched into two cracks. may be stop drilled.

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. machining fins directly on the outside of the barrel. shrinking on a jacket or muff of aluminum cooling fins around a steel cylinder sleeve. 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).

In addition to causing accelerated wear, dust or sand ingested by a reciprocating engine may also cause. silicon fouling of spark plugs. sludge formation. acid formation.

During ground operation of an engine, the cowl flaps should be in what position?. Fully closed. Fully open. Opened according to ambient conditions.

The purpose of a bellmouth compressor inlet is to. provide an increased ram air effect at low airspeeds. maximize the aerodynamic efficiency of the inlet. provide an increased pressure drop in the inlet.

Which of the following statements is true?. Some aircraft exhaust systems include an augmenter system to remove air over the engine for cooling. Augmenter systems are used to create a low-pressure area at the lower rear of the aircraft engine cowling. Augmenter systems are used to create a high-pressure area at the lower rear of the aircraft engine cowling.

An increase in manifold pressure when carburetor heat is applied indicates. ice was forming in the carburetor. mixture was too lean. overheating of cylinder heads.

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?. Venturi. Intake manifold. Carburetor air scoop.