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What are factors that decrease VE?
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Which strokes are both valves open?
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Final review 2201

QuestionAnswer
What are factors that decrease VE? Improper valve timing, sharp bends in the induction system, and high carburetor air temperatures
Which strokes are both valves open? Intake and exhaust
Three types of bearings used Plain, roller, and ball bearings
Which one has the least rolling friction? Ball bearing
Which would make a good thrust bearing? Deep grooved ball bearing
How many springs are required for valves? 2- Redundancy and reduction of vibration, valve flutter dampening
When is the air fuel mixture ignited? compression stroke
Operating valve clearance will be greater when hot
Cam ground piston Oval shaped that turns round when heated
Primary concern when establishing a firing order? – provide for balance and eliminate vibration to the greatest extent possible
Grinding the valves of a reciprocating engine to a feather edge is likely to result in – preignition and burned valves
Master rod bearing for a radial engine are generally what type? Plain
Which bearing is least likely to be a rolling or ball bearing in a radial engine? Master rod bearing
. What is the HP delivered to the propeller called? brake horsepower
When is the combustion process completed? Shortly after TDC on the power stroke
A condition that occurs in radial engines but not horizontally opposed engines is hydraulic lock
Five events of an engine Intake, compression, ignition, power, exhaust
Which statement is correct in regard to engine crankshafts? Moveable counterweights reduce dynamic vibrations
What is the principle advantage of propeller reduction gear? increase engine RPM without breaking sound barrier
What is a choke or tapered ground cylinder – slightly smaller at the top of the cylinder and expands when it heats up. Provides a straight cylinder bore at operating temperatures
What can happen if the intake valve opens too early? Backfiring into the induction system
What is valve overlap? When both valves are off their seat
Where do most cylinders wear-out the most? at the top because the heat and least amount of oil
What is the operating valve clearance for an engine with hydraulic lifters? 0
Method of hardening cylinder walls? nitriding or chrome plating
Which of the following is caused by excessive valve clearance? Intake and exhaust valves will open late and close early
Which statement is correct regarding 4-stroke engines? Intake valve closes on the compression stroke
What is compression ratio? the ratio between cylinder volume with piston at bottom dead center and top dead center
Which of the following will be caused by excessive valve clearance? opening late and closing early
Why does the smoothness of operation of an engine increase with a greater number of cylinders? The power impulses are closer together
What does valve overlap promote? Better scavenging and cooling characteristics
Excessive valve clearance causes the duration to increase
Excessive valve clearance causes Reduced valve overlap period
If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the engine? The valves will open late and close early
Which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearances? The valves will not seat positively during start and engine warmup
Primary purpose of proper valve timing and overlap obtain the best volumetric efficiency and lower cylinder operating temperatures
What do full floating piston heads allow motion between? the piston and the connecting rod
If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is low oil pressure
Cast iron piston rings may be used in chrome plated cylinders.
Chrome plated rings may be used in plain steel cylinders.
If the exhaust valve closed, and the intake valve just closed, what stroke is the engine on? Compression
A hissing sound from the exhaust when turning the prop manually exhaust valve isn’t seated
What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines? Reduced valve operating temperatures
What is oil viscosity? Resistance to flow
Which of the following has the greatest effect on the viscosity of lubricating oil? Temperature
What component controls the oil pressure Maybe oil pressure regulator
Horsepower in the cylinders indicated
Before starting a radial engine, what should be attempted? Rotate the prop in the same direction
If the oil pressure of a cold engine is higher than at operating temperature normal operation
When does valve overlap occur? At the end of the exhaust stroke and the beginning of the intake stroke
Which fuel/air mixture will burn all of the fuel and air? Stoichiometric
Backfiring from the carburetor is caused by using running excessively lean
Which of the following conditions will lead to bleeding detonation? Low octane fuel
Which of the following is true? preignition is caused by an area that is incandescent
When would small induction system air leaks have the most noticeable effects At low RPM
What can cause excessive build-up in the crankcase of a recip engine? Plugged crankcase breather
An unsupercharged aircraft reciprocating engine, operated at full throttle from sea level to 10,000 feet, provided the RPM is unchanged, will lose power due to the reduced density of the air drawn into the cylinders
What does a TSIO engine designation stand for? Turbocharged, supercharged, fuel injected, opposed
What is the advantage of an inline engine? aerodynamic
how many cylinders does a radial engine have in the first row An odd number of cylinders
What does the clearance between the rocker arm and the valve tip affect? Height of the valve opening, point at which the valve opens, duration of valve opening
What variable can the pilot control to increase VE RPM and Throttle
Back suction mixture control operates by varying the pressure acting on the fuel in the float chamber
Purpose of the economizer provide a richer mixture and cooling at maximum power output
What stroke does the fuel injection system inject fuel? all of them
Where is the carb heat in a fuel injection system? Doesn't have one
What are pole shoes made of? laminated soft iron to dissipate magnetism readily
E-gap angle is defined as several degrees of magnet rotation beyond the magnet's neutral position
Spark is produced when breaker points are Open
What is grounded when the ignition switch it turned off? P-leads
What is the purpose of using an impulse coupling with a magneto? To produce a momentary high rotational speed of the magneto
What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines? Reduced valve operating temperatures
Created by: ryan.schaff
 

 



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