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Powerplant
| Question | Answer |
|---|---|
| Which statement is true regarding bearings used in high- powered reciprocating aircraft engines? | There is less rolling friction when ball bearings are used than when roller bearings are employed. |
| A 9 cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of | 1283 cubic inches |
| The actual power delivered to the propeller of an aircraft engine is called | Brake horsepower |
| After spark plugs from am opposed engine have been serviced, in which position should they be reinstalled? | Next in firing order to the one from which they were removed and swapped bottom to top |
| A characteristic of dyna-focal engine mounts as applied to aircraft reciprocating engines is that the | Shock mounts points toward the engineâs center of gravity. |
| If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is | Low oil pressure |
| At what speed must a crankshaft turn if each cylinder of a four-stroke cycle engine is to be fired 200 times a minute? | 400 RPM |
| If an engine cylinder is to be removed, at what position in the cylinder should the piston be? | Top dead center |
| During ground check an engine is found to be running rough, the magneto drop is normal, and the manifold pressure is higher than normal for any given rpm. The trouble may he caused by | A dead cylinder |
| An increase in manifold pressure with a constant rpm will cause the bearing load in an engine to | Increase |
| Which of these conditions will cause an engine to have an increased tendency to detonate? 1. High manifold pressure 2. High intake air temperature 3. Engine overheated 4. Late ignition timing | 1,2,3 |
| In a gas turbine engine, combustion occurs at a a constant | Pressure |
| When starting a turbine engine, | A hot start is indicated if the exhaust gas temperature exceeds specified limits |
| A turbine engine compressor which contains vanes on both sides of the impeller s a | Double entry centrifugal compressor |
| What is the proper starting sequence for a turbojet engine? | Starter, ignition, fuel |
| The pressure of subsonic air as it flows through a convergent nozzle | DecreaseS |
| Newtonâs First Law of Motion, generally termed the Law of Inertia, states: | Every body persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force |
| Newtonâs Law of Motion, generally termed the âLaw of Momentumâ, states | Acceleration is produced when a force acts on a mass. The greater the mass, the greater the amount of force needed. |
| Dirt particles in the air being introduced into the compressor of a turbine engine will form o all but which of the following? | Turbine blades |
| Which of the following influences the operation of an automatic fuel control unit on a turbojet engine? | Burner pressure |
| What is meant by a shrouded turbine? | The turbine blades are shaped so that their ends form a band or shroud. |
| 1) Accumulation of contaminants in the compressor of a turbojet engine reduces aerodynamic efficiency of the blades 2) Two common methods is for removing dirt deposits from turbojet engine compressor blades are a fluid wash and an abrasive grit blast | Both 1&2 are true |
| A condition known as âhot streakingâ in turbine engines is caused by | Partially clogged fuel nozzles |
Created by:
Stunt