What is the principal advantage of using propeller reduction gears?

Which statement is true regarding bearings used in high-powered reciprocating aircraft engines?

Which statement is correct regarding engine crankshafts?

Master rod bearings are generally what type?

Cam-round pistons are installed in some aircraft engines to

Which of the following is a characteristic of a thrust bearing used in most radial engines?

Which bearing is least likely to be a roller or ball bearing?

The operating temperature valve clearance of a radial engine as compared to cold valve clearance is

Some cylinder barrels are hardened by

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

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

Some aircraft engine manufacturers equip their product with choked or taper-ground cylinders in order to

An aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance in its valve-operating mechanism after the minimum inlet oil and cylinder head tenperatures for takeoff have been reached. When can this condition be expected?

Wnat special procedure must be followed when adjustiug the valves of an engine equipped with a floating cam ring?

What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines?

Valve clearance changes on opposed-type engines using hy draulic lifters are accomplished by

Full-floating piston pins are those which allow motion between the pin and

If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the engine?

The purpose of two or more valve springs in aircraft engines is to

Where are sludge chambets, when used in aircraft engine lubrication svstems, usually located?

Excessive oil is prevented from accurmulating on the cylinder walls of a reciprocating engine by

The valve assemblies of opposed reciprocating engines are lubricated by means of a

What could cause excessive pressure buildup in the crankcase of a reciprocating engine?

How is the oil coilected by the piston oil ring returned to the crankcase?

Oil accumulation in the cylinders of an inverted inline engine and in the lower cylinders of a radial engine is normally reduced or prevented by

Sodium-filled valves are advantageous to an aviation engine because they

At what speed nust a crankshaft turn if each cylinder of a four-stroke cycle engine is to be fired 200 times a minute?

You are performing a 100-hour inspection on an R985-22 aircraft engine. What does the 985" indicate?

How are the piston pins of most aircraft engines Iubricated?

Which of the following bearing types must be continuously lubricated by pressure oil?

The undersides of pistons are frequently finned. The principal reason is to

A nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of

Which of the following will decrease volumetric efficiency in a reciprocating engine? 1. Full throttle operation. 2. Low cylinder head temperatures. 3. Improper valve timing. 4. Sharp bends in the induction system. 5. High carburetor air temperatures.

If fuel/air ratio is proper and ignition timing is correct, the combustion process should be completed.

On which strokes are both valves on a four-stroke cycle reciprocating engine open?

The five events of a four-stroke cycle engine in the order of their occurence are

The primary concerm in establishing the firing order for an opposed engine is to

If an engine with a stroke of 6 inches is operated at 2,000 RPM, the piston movement within the cylinder will be

Which statement is correct regarding a four-stroke cycie aircraft engine?

The actual power delivered to the propeller of an aircraft engine is called

Using the following information, determine how many degrees the crankshaft will rotate with both the intake and exhaust valves seated. Intake opens 15° BTDC. Exhaust opens 70° BBDC. Intake closes 45° ABDC. Exhaust closes 10° ATDC.

Valve overlap is defined as the number of degrees of crankshaft travel

If the exhaust valve of a four-stroke cycle engine is closed and the intake valve is just closed, the piston is on the

Ignition occurs at 28° BTDC on a certain four-stroke cycle engine, and the intake valve opens at 15° BTDC. Aow many degrees of crankshrft travel after ignition does the intake valve open? (Consider one cylinder only.)

When is the fuel/air mixture ignited in a conventional reciprocating engine?

How many of the following are factors in establishing the maximum compression ratio limitation of an aircraft engine? 1. Detonation characteristics of the fuel used. 2. Design limitations of the engine. 3. Degree of supercharging. 4. Spark plug reach.

The primary purpose in setting proper valve timing and overlap is to

What does valve overlap promote?

The volume of a cylinder equals 70 cubic inches when the piston is at bottom center. When the piston is at the top of the cylinder, the volume equals 10 cubic inches. What is the compression ratio?

Compression ratio is the ratio between the

An unsupercharged air oraft reciprocating engine, operated at full throttle from sea level to 10,000 feet, provided the RPM is unchanged, will

The norsepower develor 2d in the cylinders of a reciprocating engine is known as the

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

An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to

Increased engine heat wIll cause volumetric efficiency to

Why does the smoothness of operation of an engine increase with a greater number of cylinders?

Which of these conditicns 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.

Excessive valve clearance in a piston engine

Which of the following results in a decrease in volumetric efficiency?

If the intake valve is opened too early in the cycle of operation of a four-stroke cycle engine, it may result in

What is the purpose of a power check on a reciprocating engine?

Which unit most accurately indicates fuel consumption of a reciprocating engine?

A condition that can occur in radial engines but is uniikely to occur in horizontally opposed engines is

If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is

Excessive valve clearances will cause the duration of valve opening to

Which of the following will be caused by excessive valve clearance of a cylinder on a reciprocating aircraft engine?

As the pressure is applied during a reciprocating engine compression check using a differential pressure tester, what would a movement of the propeller in the direction of engine rotation indicate?

Excessive valve clearance results in the valves opening

Which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearances?

If air is heard coming from the crankcase breather or oil filler during a differential compression check, what is this an indication of?

standard sea level pressure is

Before attempting to starta radial engine that has been shut down for more than 30 minutes,

A hissing sound from the exhaust stacks when the propeller is being pulled through manually indicates

The fuel flow meter used with a continuous-fuel injection system installed on an aircraft horizontally opposed reciprocating engine measures the fuel pressure drop across the

The principle fault in the pressure type fuel flow meter indicating system, installed on a horizontally opposed continuous-flow fuel injected aircraft reciprocating engine, is that a plugged fuel injection nuzzle will cause a

Motor driven impeller and turbine fuel flow transnitters are designed to transmit data

Using standard atmospheric conditions, the standard sea level temnperature is

Newton's First Law of Motion, generally tenned the Law of Inertia, states:

What section in the instructions for continued airworthiness is FAA approved?

In addition to fuel quantity. a computerized fuel system (CFS) with a totalizer-indicator provides indication of how many of the following? 1. Fuel flow rate 2. Fuel used since reset or initial sart-up. 3. Fuel time remaining at curent power seting. 4. Fuel termperature.

The fuel-flow indication data sent from motor driven impeller and turbine, and motorless type fuel flow transmitters is a measure of

The fuel-flow indicator rotor and needle for a motor-impeller and turbine indicating system is driven by

On a twin-engine aircraft with fuel-injected reciprocating engines, one fuel-flow indicator reads considerably higher than the other in all engine operating configurations. What is the probable cause of this indication?

The fuel-flow indication system used with many fuel-injected opposed engine airplanes utilizes a measure of

Which of the following types of electric motors are commonly used in electric tachometers?

Where are the hot and cold junctions located in an engine cylinder temperature indicating system?

In an aircraft equipped with a pressure-drop type fuel-How indicating system. if one of the injector nozzles becomes restricted, this would cause a decrease in fuel flow with

A manifold pressure gauge is designed to

The purpose of an exhaust gas analyzer is to indicate the

Which statement is true regarding a thermocouple type cylinder head temperature measuring system?

What basic meter is used to indicate cylinder head temperature in most aircraft?

Which of the following is a primary engine instrument

Basically, the indicator of a tachometer system is responsive to change in

Which statement is correct concerning a thermocouple-type temperature indicating instrument system?

What unit in a tachometer system sends information to the indicator?

At what point in an axial-flow curbojet engine will the highest gas pressures occur?

One function of the nozzle diaphragm in a turbine engine is to

What is the profile of a turbine engine compressor blade?

Turbine nozzle diaphrags located on the upstream side of each turbine wheel are used in the gas turbine engine to

Some high-volume turboprop and turbojet engines are equipped with two-spool or split compressors. When these engines are operated at high altitudes, the