AS 356 Exam 1

For a 4 cycle, how many power strokes will each cylinder have if the engine crank shaft turns 2 full revolutions?

1

In a 4-cycle reciprocating engine, if the piston moves up and down 4 times to complete a full cycle, each valve will open

1 times

Add or subtract 1in Hg for each ____ ft of field elevation from the altimeter setting. This is termed the Attitude Effect.

1000

A reciprocating engine's crank shaft turns at _____% of the speed of the cam shaft.

200 (2:1)

_____ is the termed used to describe the altitude where the throttle is fully open in order to achieve the desired power setting. The desired power setting cannot be maintained above this altitude.

Critical Altitude

The best and most accurate indication a pilot has of engine combustion efficiency is _____ for most reciprocating engines.

Exhaust Gas Temperature

Which component is used to decrease the high temperature of the compressed air destined for the engine induction system and for combustion? this is needed on some engines to prevent detonation and/or pre ignition.

Intercooler

The wire that grounds the magnetos when the magneto switch is in the OFF position is called the

P-lead

Which of the following is not a bearing used in an aircraft engine?

Plain, Ball and roller bearings can all be used in aircraft engines

Is the propeller blade angle(fixed pitch propeller) smaller or larger at the blade tip?

Smaller

What will happen if the air inlet in the engine cowl is completely covered by ice?

The alternate air source must be opened either automatically or manually to avoid engine failure.

In a multi engine plane with a reciprocating engine and a constant speed propeller, what happens when the pilot pulls the propeller control knob/ lever aft(out)?

The hub spring pushes the propeller into a high pitch, low RPM position

The air pressure inside the crankcase (not cylinders)of a reciprocating engine, for an aircraft in normal cruise flight will be

about equal to ambient pressure

A large amount of water vapor in the air will cause a significant reduction of power produced by reciprocating aircraft engines

agree

The turbocharger on an aircraft engine compresses

air

What is the principal fluid used for propulsion by virtually all heat engines, including the airplane reciprocating engine?

air

At a sea level airport, with the engine not running, the manifold pressure(MAP) gauges should indicate pressure equal to the

ambient atmospheric pressure

The type of engine oil most commonly used in modern general aviation horizontally opposed reciprocating engine which is fifty hours or more past its last major overhaul and the "break in" period is:

ashes-dispersant

A condition in which Mapo fluctuates after making a power change but doesn't damage the engine is termed _____ Not NA engine

bootstrapping

The engine component causes/starts the engine's valves to open and close at the proper time and for the proper duration

camshaft

Intake and exhaust valves for an engine cylinder are spring loaded in the

closed position

The letter W used in aircraft engine oil designations (ex SAE 5W30) indicates that the oil is approved for

cold winter operations

Which type of propeller will give an aircraft near optimal performance under all flight conditions?

constant speed propeller

The foundation of a reciprocating engine is the

crankcase

A journal will most commonly be found on which engine component

crankshaft

This components main purpose is to transform the reciprocating motion of the pistons and connecting rods into rotary motion for the rotation of the propeller. On many small planes this component drives the propeller.

crankshaft

When the fuel-air mixture in a cylinder reaches a certain pressure and temperature, it will explode in a destructive manner rather than burn evenly, and this explosion is known as

detonation

A reciprocating engine's cylinder's intake and exhaust valves will never/can never be open at the same time during normal operation.

disagree

When first applying carb heat to an operating reciprocating engine (fixed pitch propeller) the engine rpm will____ because of a change in the air density caused by the introduction of warm air.

drop

The type of aircraft reciprocating engine lubrication system which has a separate( not attached to the engine) oil reservoir is termed a

dry-sump

The flatter side( not cambered) of a propeller is termed the blade

face

Oil which flows slowly is said to have this kind of viscosity

high

On a single engine general aviation aircraft, equipped with a constant speed propeller, engine oil pressure is needed to primarily overcome propeller dome spring pressure to _____ the prop blade angle.

increase

On an aircraft equipped with a constant speed propeller, pulling the cockpit prop control(blue handle) back with the engine power set in the flight regime (MAP) will cause the propeller blade angle to ______ and the prop RPM to ______

increase, decrease

Manifold Absolute Pressure is a measure of absolute pressure in the reciprocating engine's____ and is measured on the MAP indicator in the cockpit in inches of HG

intake manifold

Turning a propeller by hand can be dangerous, pilots should know the engine could start if there is a malfunction of the

magnetos switch/wiring

A fuel injected aircraft engine is more efficient than an engine with a carburetor due to

more precise/ even distribution of fuel to each cylinder

What is the relationship between commercial aviation grade lubricating oil numbers and SAE numbers?

no relationship

What is the third cycle/stroke of the 4 stroke complete operating cycle?

power

As a general rule, when in cruise flight and applying engine power for a climb in an aircraft with a constant speed propeller, the _____ should be adjusted/changed first.

propeller

For a reciprocating airplane engine equipped with a constant speed propeller, the _____ controls the engine/prop RPM and the ____ controls the engine manifold pressure(MAP).

propeller control; throttle

Does the application of carburetor heat richen or lean the engine's fuel mixture?

richen

The difference between the geometric pitch and the effective pitch of the propeller us termed

slip

The most efficient propeller angle of attack(AOA) for achieving maximum efficiency is

small - approx. 3 degrees

Which device causes the loss of some of the engine hp/performance due to the load it places on the engine?

supercharger

The force that tends to bend a propeller blade forward under high power settings is termed

thrust bending force

A waste gate is a component found on a reciprocating engine eqquipped with a

turbocharger

Which engine performance improving device is driven by the engine exhaust?

turbocharger

What creates the low pressure at the fuel discharge nozzle of a float carburetor

venturi

When cruising at a high power settings a pilot can quickly add accurately tell the difference between pre-ignition and detonation in the cylinders of the engine by

you can't tell any of these