Engine (RECIPROCATING) Quiz

Which of the following would indicate a general weak-engine condition when operated with a fixed-pitch propeller or test club?

• Lower than normal static RPM, full throttle operation.

• Manifold pressure lower at idle RPM than at static RPM.

• Lower than normal manifold pressure for any given RPM.

When does valve overlap occur in the operation of an aircraft reciprocating engine?

• At the end of the exhaust stroke and the beginning of the intake stroke.

• At the end of the compression stroke and the beginning of the power stroke.

• At the end of the power stroke and the beginning of the exhaust stroke.

During the inspection of an engine control system in which push-pull control rods are used, the threaded rod ends should

• Be checked for thread engagement of at least two threads but not more than four threads.

• Be checked for the amount of thread engagement by means of the inspection holes.

• Ensure that the safety wire passes through the hole in the shank of the rod-end.

To reduce the power output of an engine equipped with a constant-speed propeller and operating near maximum BMEP, the

• RPM is reduced with the propeller control before the manifold pressure is reduced with the throttle control.

• Manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control.

• Manifold pressure is reduced with the propeller control before the RPM is reduced with the throttle control.

When cleaning aluminum and magnesium engine parts, it is inadvisable to soak them in solutions containing soap because

• Some of the soap will become impregnated in the surface of the material and subsequently cause engine oil contamination and foaming.

• The soap can chemically alter the metals causing them to become more susceptible to corrosion.

• The parts can be destroyed by dissimilar metal electrolytic action if they are placed together in the solution for more than a few minutes.

How is proper end-gap clearance on new piston rings assured during the overhaul of an engine?

• By using rings specified by the engine manufacturer.

• By accurately measuring and matching the outside diameter of the rings with the inside diameter of the cylinders.

• By placing the rings in the cylinder and measuring the end-gap with a feeler gauge.

What is the purpose of the safety circlet installed on some valve stems?

• To prevent valves from falling into the combustion chamber.

• To hold the valve spring retaining washer in position.

• To hold the valve guide in position.

Which of the following conditions would most likely lead to detonation?

• Use of fuel with too high an octane rating.

• Late ignition timing.

• Use of fuel with too low an octane rating.

The valve clearance of an engine using hydraulic lifters, when the lifters are completely flat or empty, should not exceed

• 0.00 inch.

• A specified amount above zero.

• A specified amount below zero.

If the crankshaft runout readings on the dial indicator are plus .002 inch and minus .003 inch, the runout is

• Minus .001 inch

• Plus .001 inch

• .005 inch