Reciprocating engines Flashcards
If the ignition swath is moved from both to either left or right during an engine ground check,normal operation is usually indicated by a slight?
Drop in torque meter pressure indication
What engine does this statement go with “The intake valve closes on the compression stroke”
A four stroke cycle aircraft engine
What is the best indication of worn valve guides?
High oil consumption
Which condition would be the least likely to be caused by failed or failing engine bearings?
Low oil temperatures
To reduce the power output of an engine equipped with a constant speed propeller and operating near maximum BMEP, the
Manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control
(1)Preignition is caused by improper ignition timing
(2) Detonation occurs when an area of the combustion chamber becomes incandescent and ignites the air fuel mixture in advance of normal timed ignition.
What describes theses statements?
Neither 1 or 2 is true
Which of the following would indicate a general weak-engine condition when operated with a fixed-pitch propeller or test club
Lower than normal static RPM full throttle operation
What does vale overlap promoter
Better scavenging and cooling characterstics
By use of a differential pressure compression tester it is determined the cylinder 3 of a nine-cylinder radial engine will not hold pressure after the crankshaft has been rotated 260 degrees from top dead center compression stroke cylinder 1. How can this indications usually be interpreted
A normal indication
One of the best indicators of reciprocating engine combustion chamber problems is
Spark plug condition
Which of the following is a characteristic of a thrust bearing used in most radial engines
Deep-groove ball
(1) Cast iron piston rings may be used in chrome-plated cylinders.
(2) Chrome-plated rings may be used in plain steel cylinders.
What is the best explanation for these statements
Both 1 and 2 are true
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?
7:1
There is less rolling friction when ball bearings are used than when roller bearing are employed is true regauging bearing used in what?
High-powered reciprocating aircraft engines
Excessive valve clearance will casue the duration of valve opening to
Decrease for both intake and exhaust valeves
The valve clearance of an engine using hydraulic lifters,when the lifters are completely flat or empty should not exceed?
A specified amount above zero
If the oil pressure gauge fluctuates over a wide range from xero to normal operating pressure, the most likely cause is?
Low oil supply
Engine operating flexibility is the ability of the engine to
run smoothly and give the desired performance at all speeds
If air-fule ratio is proper and ignition timing is correct the combustion process should be completed
Judt after top center at the beginning of the power stroke
If the hot clearance is used to set the valves when the engine is cold what will occur during operations of the engine
The valves will open late and close early
The five events of a four-stroke cycle engine in the order of their occurrence are
Intake,compression, ignition,power,and exhaust
After spark plugs from an opposed engine have been serviced in what position should they be reinstalled.
Next in firing order to the one from which they were removed and swapped bottom to top
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
An engine misses in both the right and left positions of the magneto switch.The quickest method for locating the trouble is to
Check for one or more cold cylinders
