Aircraft Engines: Piston Engine Questions

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

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

Which condition would be the least likely to be caused by failed or failing engine bearings?

What is the principal advantage of using propeller reduction gears?

Which of the following will decrease volumetric efficiency in a reciprocating engine?

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

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

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

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

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

Grinding the valves of a reciprocating engine to a feather edge is likely to result in

Which statement is correct regarding engine crankshafts?

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

Which type of bearings are generally used for connecting rods and cam shafts?

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

Cam-ground pistons are installed in some aircraft engines to

Exhaust closes 10°: ATDC.

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 temperatures for takeoff have been reached. When can this condition be expected?

What tool is generally used to measure the crankshaft rotation in degrees?

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

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

Some cylinder barrels are hardened by

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

On which part of the cylinder walls of a normally operating engine will the greatest amount of wear occur?

During overhaul, reciprocating engine exhaust valves are checked for stretch

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

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

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

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

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

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

How many of the following are factors in establishing the maximum compression ratio limitations of an aircraft engine?

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

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

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

What is the purpose of installing two or more springs on each valve in an aircraft engine?

During overhaul, the disassembled parts of an engine are usually degreased with some form of mineral spirits solvent rather than water-mixed degreasers primarily because

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

Compression ratio is the ratio between the

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

Regarding the above statements,

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

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?

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

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

What will be the likely result if the piston ring gaps happen to be aligned when performing a differential pressure compression check on a cylinder?

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

The floating control thermostat, used on some reciprocating engine installations, helps regulate oil temperature by

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

What is required by 14 CFR Part 43 Appendix D when performing an annual/100-hour inspection on a reciprocating engine aircraft?

After spark plugs from an opposed engine have been serviced, in what position should they be reinstalled?

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

During routine inspection of a reciprocating engine, a deposit of small, bright, metallic particles which do not cling to the magnetic drain plug is discovered in the oil sump and on the surface of the oil filter. This condition

A characteristic of dyna-focal engine mounts as applied to aircraft reciprocating engines is that the

If metallic particles are found in the oil filter during an inspection,

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

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

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

Excessive valve clearances will cause the duration of valve opening to

What does valve overlap promote?

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

Engine crankshaft runout is usually checked

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

An engine misses in both the right and left positions of the magneto switch. The quickest method for locating the trouble is to

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

If the oil pressure of a cold engine is higher than at normal operating temperatures, the

If an engine operates with a low oil pressure and a high oil temperature, the problem may be caused by a

Which fuel/air mixture will result in the highest engine temperature (all other factors remaining constant)?

If an engine cylinder is to be removed, at what position in the cylinder should the piston be?

The horsepower developed in the cylinders of a reciprocating engine is known as the

Engine operating flexibility is the ability of the engine to

Standard aircraft cylinder oversizes usually range from 0.010 inch to 0.030 inch. Oversize on automobile engine cylinders may range up to 0.100 inch. This is because aircraft engine cylinders

If the ignition switch is moved from BOTH to either LEFT or RIGHT during an engine ground check, normal operation is usually indicated by a slight

During ground check an engine is found to be rough-running, the magneto drop is normal, and the manifold pressure is higher than normal for any given RPM. The trouble may be caused by

What is the best indication of worn valve guides?

By use of a differential pressure compression tester, it is determined that cylinder 3 of a nine-cylinder radial engine will not hold pressure after the crankshaft has been rotated 260° from top dead center compression stroke cylinder 1. How can this indication usually be interpreted?

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

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

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

What is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up?

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

Direct mechanical push-pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted

Reduced air density at high altitude has a decided effect on carburetion, resulting in a reduction of engine power by

Increased water vapor (higher relative humidity) in the incoming air to a reciprocating engine will normally result in which of the following?

Regarding the above statements,

Which of the following engine servicing operations generally requires engine pre-oiling prior to starting the engine?

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

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

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

Which of the following would most likely cause a reciprocating engine to backfire through the induction system at low RPM operation?

How may it be determined that a reciprocating engine with a dry sump is pre-oiled sufficiently?

What is the basic operational sequence for reducing the power output of an engine equipped with a constant-speed propeller?

Which statement pertaining to fuel/air ratios is true?

Backfiring through the carburetor generally results from the use of

Which of these conditions will cause an engine to have an increased tendency to detonate?

When will small induction system air leaks have the most noticeable effect on engine operation?

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

One of the best indicators of reciprocating engine combustion chamber problems is

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

Excessive valve clearance in a piston engine

To what altitude will a turbo charged engine maintain sea level pressure?

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

One cause of afterfiring in an aircraft engine is