Final review 2201
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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| What are factors that decrease VE? | Improper valve timing, sharp bends in the induction system, and high carburetor air temperatures
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| Which strokes are both valves open? | Intake and exhaust
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| Three types of bearings used | Plain, roller, and ball bearings
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| Which one has the least rolling friction? | Ball bearing
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| Which would make a good thrust bearing? | Deep grooved ball bearing
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| How many springs are required for valves? | 2- Redundancy and reduction of vibration, valve flutter dampening
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| When is the air fuel mixture ignited? | compression stroke
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| Operating valve clearance | will be greater when hot
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| Cam ground piston | Oval shaped that turns round when heated
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| Primary concern when establishing a firing order? | – provide for balance and eliminate vibration to the greatest extent possible
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| Grinding the valves of a reciprocating engine to a feather edge is likely to result in – | preignition and burned valves
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| Master rod bearing for a radial engine are generally what type? | Plain
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| Which bearing is least likely to be a rolling or ball bearing in a radial engine? | Master rod bearing
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| . What is the HP delivered to the propeller called? | brake horsepower
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| When is the combustion process completed? | Shortly after TDC on the power stroke
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| A condition that occurs in radial engines but not horizontally opposed engines is | hydraulic lock
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| Five events of an engine | Intake, compression, ignition, power, exhaust
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| Which statement is correct in regard to engine crankshafts? | Moveable counterweights reduce dynamic vibrations
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| What is the principle advantage of propeller reduction gear? | increase engine RPM without breaking sound barrier
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| 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
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| What can happen if the intake valve opens too early? | Backfiring into the induction system
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| What is valve overlap? | When both valves are off their seat
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| Where do most cylinders wear-out the most? | at the top because the heat and least amount of oil
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| What is the operating valve clearance for an engine with hydraulic lifters? | 0
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| Method of hardening cylinder walls? | nitriding or chrome plating
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| Which of the following is caused by excessive valve clearance? | Intake and exhaust valves will open late and close early
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| Which statement is correct regarding 4-stroke engines? | Intake valve closes on the compression stroke
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| What is compression ratio? | the ratio between cylinder volume with piston at bottom dead center and top dead center
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| Which of the following will be caused by excessive valve clearance? | opening late and closing early
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| Why does the smoothness of operation of an engine increase with a greater number of cylinders? | The power impulses are closer together
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| What does valve overlap promote? | Better scavenging and cooling characteristics
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| Excessive valve clearance causes the duration | to increase
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| Excessive valve clearance causes | Reduced valve overlap period
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| 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
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| 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
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| Primary purpose of proper valve timing and overlap | obtain the best volumetric efficiency and lower cylinder operating temperatures
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| What do full floating piston heads allow motion between? | the piston and the connecting rod
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| If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is | low oil pressure
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| Cast iron piston rings may be used in | chrome plated cylinders.
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| Chrome plated rings may be used in | plain steel cylinders.
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| If the exhaust valve closed, and the intake valve just closed, what stroke is the engine on? | Compression
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| A hissing sound from the exhaust when turning the prop manually | exhaust valve isn’t seated
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| What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines? | Reduced valve operating temperatures
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| What is oil viscosity? | Resistance to flow
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| Which of the following has the greatest effect on the viscosity of lubricating oil? | Temperature
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| What component controls the oil pressure | Maybe oil pressure regulator
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| Horsepower in the cylinders | indicated
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| Before starting a radial engine, what should be attempted? | Rotate the prop in the same direction
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| If the oil pressure of a cold engine is higher than at operating temperature | normal operation
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| When does valve overlap occur? | At the end of the exhaust stroke and the beginning of the intake stroke
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| Which fuel/air mixture will burn all of the fuel and air? | Stoichiometric
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| Backfiring from the carburetor is caused by using | running excessively lean
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| Which of the following conditions will lead to bleeding detonation? | Low octane fuel
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| Which of the following is true? | preignition is caused by an area that is incandescent
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| When would small induction system air leaks have the most noticeable effects | At low RPM
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| What can cause excessive build-up in the crankcase of a recip engine? | Plugged crankcase breather
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| 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
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| What does a TSIO engine designation stand for? | Turbocharged, supercharged, fuel injected, opposed
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| What is the advantage of an inline engine? | aerodynamic
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| how many cylinders does a radial engine have in the first row | An odd number of cylinders
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| 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
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| What variable can the pilot control to increase VE | RPM and Throttle
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| Back suction mixture control operates by | varying the pressure acting on the fuel in the float chamber
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| Purpose of the economizer | provide a richer mixture and cooling at maximum power output
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| What stroke does the fuel injection system inject fuel? | all of them
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| Where is the carb heat in a fuel injection system? | Doesn't have one
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| What are pole shoes made of? | laminated soft iron to dissipate magnetism readily
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| E-gap angle is defined as | several degrees of magnet rotation beyond the magnet's neutral position
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| Spark is produced when breaker points are | Open
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| What is grounded when the ignition switch it turned off? | P-leads
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| What is the purpose of using an impulse coupling with a magneto? | To produce a momentary high rotational speed of the magneto
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| What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines? | Reduced valve operating temperatures
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Created by:
ryan.schaff