Term
| why does ice form in the throat of a float carburetor? |
|
Definition
| when liquid fuel evaporates it absorbs enough from the air to cause moisture to condense out and freeze |
|
|
Term
| does the application of carb heat cause the fuel air mixture to become richer or leaner? |
|
Definition
| the less dense, heated air draws the same amount of fuel from the carb as cold air, therfore the mixture becomes richer. |
|
|
Term
| what happens to the engine RPM when carb heat is applied? |
|
Definition
|
|
Term
| why should the use of carb heat be limited when operating an engine when the aircraft is on the ground |
|
Definition
| the air that flows into the engine when carb heat is applied is not filtered. |
|
|
Term
| why is a fuel injected reciprocating enginenot as prone to icing as an engine equipped with a float carb? |
|
Definition
| in a fuel injected engine, the liquid fuel evaporates in the intake valve chamber of the hot cylinder head. |
|
|
Term
| how is ice prevented from forming on the nose cowl, dome nose, and inlet guide vanes of a turbine engine? |
|
Definition
| hot compressor bleed air flows through passages in these components too keep them to warm for ice to form. |
|
|
Term
| where is heat taken from that is used to heat the induction air in a reciprocating engine? |
|
Definition
| from a muff that is installed around some part of the exhaust system. |
|
|
Term
| where does the alternate come from that is used with a pressure carb or a fuel injection system? |
|
Definition
| from inside the engine cowling |
|
|
Term
| where does carb ice normally form in a carb? |
|
Definition
| in the throat of the carb, on and around the throttle valve. |
|
|
Term
| does the application of carb heat cause the fuel air mixture to become richer or to become leaner? |
|
Definition
|
|
Term
| what is used to drive most of the external superchargers used on modern reciprocating engines? |
|
Definition
|
|
Term
| what controls the speed of a turbocharger compressor? |
|
Definition
| the amount of exhaust gas that is forced to flow through the turbine. this is controlled by the position of the waste gate. |
|
|
Term
| what is meant by a convergent inlet duct for a turbine engine? |
|
Definition
| a convergent duct is one whose cross sectional area becomes smaller in the direction the air flows. |
|
|
Term
| what is meant by a divergent inlet duct for a turbine engine? |
|
Definition
| cross sectional area becomes greater inthe direction the air flows. |
|
|
Term
| what kind of inlet duct is often used on turbine powered helicopters |
|
Definition
| a bell mouthed inlet duct |
|
|
Term
| what is the danger of operating an aircraft reciprocating engine with too high a carb air temp? |
|
Definition
|
|
Term
| why do some turbine engines use variable inlet guide vanes? |
|
Definition
| vanes adjusted to keep RPM vs velocity for efficiency. |
|
|
Term
| how do some turbine engines prevent ice formation on the inlet guide vanes? |
|
Definition
| hot compressor bleed air flows through hollow inlet guide vanes |
|
|
Term
| what is usually installed in a large reciprocating engine between the turbo charger and the carb? |
|
Definition
| intercooler, air to air heat exchanger |
|
|
Term
| in what position should the carburetor heat control be placed when starting a reciprocating engine? |
|
Definition
|
|
Term
| how does an engine air inlet vortex destroyer help prevent foreign object damage to the engine? |
|
Definition
| a high velocity stream of compressor bleed air is blown out in front of the engine to break up the vortices that form in front of the engine when it is operating at high power on the ground. |
|
|
