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AMT 287 Exam 1 Makana questions & answers graded A+ passed
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AMT 287 Exam 1 Makana questions &answers graded A+ passed
Neglecting drag, how much power is needed to cause a 2500-pound airplane to climb at 1000 R2/mig
Express your answer in ft-lbs/min, watts and HP. - correct answer ✔✔2500 lb * 1000 ft= 2,500,000 ft-
lb/min
(1 HP/33,000 ft-lb/min) * (2,500,000 ft-lb/min) = 75.76 HP
(746 watts/ 1 HP)*(75.7 HP) = 56,515.115 watts
Three minutes after take-off how much potential energy will the aircraft of Question #1 possess (neglet
remaining fuel in the tanks)? - correct answer ✔✔2,500 lb * 1000 ft.min * 3 min = 7,500,000 ft-lb
PE = 7,500,000 ft-lb
What are the states of matter? Define or describe each. - correct answer ✔✔Solids: Have a definite
volume and a definite shape
Liquids: Have a definite volume but take the shape of vessel
Gases: Have neither a definite cilium nor shape but expands
Plasma: Made of very hot, ionized gases (sun and stars)
What distinguishes a liquid from a gas and what is a fluid? - correct answer ✔✔1) Gases fill their
containers completely, but liquids may not
2) Gases are lighter than equal climes of liquids
3) Gases are highly compressible, but liquids are essentially not compressible
Fluid: a substance which changes its shape easily and takes the shape of the container.
Show the value of pressure of the standard day atmosphere at sea level in five different units of
measure. - correct answer ✔✔1) 760 mm of mercury
2) 14.70 lbs/in^2
3) 1,1013.25 * 10^3 dynes
4) 1,013.25 millibars
,5) 101.325 kilopascals
Show the value of temperature of the standard day atmosphere at sea level in four different units of
measure. - correct answer ✔✔1) 59˚ F
2) 15˚ C
3) 298.18 ˚K
4) 518.67˚ R
What kind of a lever is your forearm? - correct answer ✔✔3rd class lever
What kind of a lever is a hydraulic wobble pump handle? - correct answer ✔✔3rd Class lever
What are the differences between inertia and momentum? - correct answer ✔✔Inertia is the resistance
offered by a body to the motion whereas momentum is the tendency of a body to continue moving.
What is the principal fluid used for propulsion by most heat engines? - correct answer ✔✔Air is the
principal fluid for propulsion
Define Thrust - correct answer ✔✔Thrust it the force which propels the aircraft.
What is THP (name and define, or describe it)? - correct answer ✔✔THP is thrust horsepower
calculated by multiplying thrust by by aircraft speed (in MPH) divided by by 375 mile-pounds per hour.
(thrust* aircraft speed (mph))/ (375 miles-punters per hour) = THP
How much thrust is being used by an atreraft that is using 100 THP to go 100 MPH? - correct answer
✔✔X(100mph)/375 = 100 THP
X= 375 lbs of thrust
How much more or less thrust than the airplane of Question #5 is another aircraft using that is using 100
THP, just like the airplane of Question #5, but is going 90 KTS? - correct answer ✔✔X(103.6)/375 = 100
THP
, X=632.0 lbs of thrust
13.0 lbs less than Q #5
What are the advantages of a hydraulic lifter? - correct answer ✔✔The advantages of a hydraulic valve
filter or tappets is that it automatically keep the value at 0, trapping the oil in the pressure chamber.
Then, a predetermined leakage occurs between the plunger and cylinder, compensating for any
expansion or contraction in the valve train.
Name all the parts in a typical cylinder assembly: describe the function of each and what material it is
made of. - correct answer ✔✔There are two major parts in a cylinder assembly: 1) Cylinder head 2)
Cylinder barrel.
1) The cylinder head is made out of aluminum alloy. Provides a place for the combustion of the fuel/air
mixture and to give the cylinder more heat conductivity for adequate cooling.
2) The cylinder barrel is made out of steel alloy. They hold the piston, therefore, the steel alloy must be
light and withstand high temperatures.
What is the purpose of the process called nitriding? - correct answer ✔✔The purpose of nitriding is for
the steel of the cylinder barrel to soak up nitrogen for the gas which forms iron nitrides on the exposed
surface.
What is the main function of a piston? - correct answer ✔✔The main purpose of the piston in a
reciprocating engine is to act as a moving wall within the combustion chamber. as the piston moves
down, it draws in fuel/air mixture. as it moves upward, it compresses the charge, ignition occurs.
Describe the purpose and operation of a dynamic damper. - correct answer ✔✔A dynamic damper is a
pendulum, fastened to the crankshaft. It is incorporated in the counterweight assembly and reduces
vibration during engine operation.
What three energy forms does the reciprocating engine utilize or convert? - correct answer ✔✔Chemical
energy into heat energy then into mechanical energy.
Describe the operating cycle of the typical aircraft reciprocating engine. - correct answer ✔✔The
operating cycles in general use is the (1) two-stroke cycle and the (2) four-stroke cycle. Most aircraft
operate on a four-stroke cycle.
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