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ASA POWERPLANT ORAL STUDY GUIDE WITH COMPLETE SOLUTIONS 2024 GRADED A+
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ASA POWERPLANT ORAL STUDY GUIDE WITH COMPLETE SOLUTIONS 2024 GRADED A+
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ASA POWERPLANT ORAL STUDY GUIDE WITHCOMPLETE SOLUTIONS 2024 GRADED A+
Does a break in a continuous-loop fire detection system keep the system from detecting a fire? -
ANSWER...No, the unit will show a fault when it is tested, but it will still warn of a fire.
Does the pressure-type continuous-element fire detector system detect a general overheat
condition, as well as a fire? - ANSWER...Yes, a high temperature on a small portion of the
sensor or a lower temperature over the entire sensor will cause it to release enough gas to close
the diaphragm switch and warn of a fire.
What are the two most commonly used fire extinguishing agents used for engine fires? -
ANSWER...Halogenated hydrocarbon, such as Halon 1301, and carbon dioxide.
What extinguishing agent is used in the high-rate-discharge fire extinguishing systems installed
in most turbojet engine installations? - ANSWER...Halon 1301.
What happens when the pilot pulls the fire-pull T-handle in the cockpit of a jet transport
airplane? - ANSWER...The bottle discharge switch is uncovered and armed, the generator field
relay is tripped, fuel is shut off to the engine, hydraulic fluid is shut off to the pump, the engine
bleed air is shut off, and the hydraulic pump low-pressure lights are deactivated.
Which type of fire detection system operates on the rate of temperature rise? - ANSWER...The
thermocouple system.
What is indicated if the yellow blow-out plug of the fire extinguisher system on the side of an
engine nacelle is blown out? - ANSWER...The built-in fire extinguishing system has been
discharged by normal operation.
How is a pressure-type continuous-element fire detector system checked for operation? -
ANSWER...Low-voltage alternating current is sent through the sheath of the detector element.
This heats the element, and it releases enough gas to close the diaphragm switch.
Why is stranded wire used rather than solid wire, in most powerplant electrical systems? -
ANSWER...Solid wire is likely to break when it is subjected to vibration.
,What two things must be considered in selection of wire size when making an electrical
installation in an aircraft? - ANSWER...The current-carrying capability of the wire and the
amount of voltage drop that is caused by current flowing through the wire.
Why are the wires in certain electrical installations twisted together? - ANSWER...By twisting
the wires together, the magnetic fields caused by current flowing in the wires are minimized.
What is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead
or frame? - ANSWER...A grommet around the edges of the hole.
How are electrical wires protected where they pass through an area of high temperature? -
ANSWER...Wires passing through these areas are insulated with high temperature insulation,
and the wires are enclosed in some type of protective conduit.
What is the minimum separation that is allowed between a wire bundle and a fluid line that
carries combustible fluid or oxygen? - ANSWER...A minimum of six inches.
What is the significance of the color of the solderless connectors that are used on electrical
wires? - ANSWER...The color of the insulation indicates the size of the wire the connector will
fit. Red terminals fit 22- through 18-gage wire, blue terminals fit 16- and 14-gage wire, and
yellow terminals fit 12- and 10-gage wire.
What is the maximum number of wire terminals that may be stacked on a single stud in a
terminal strip? - ANSWER...Four.
What is the purpose of the shielding that is used to encase some electrical wires? -
ANSWER...Shielding intercepts radiated electromagnet energy and carries it to ground so it will
not interfere with any nearby sensitive electronic equipment.
Why must a switch be derated if it is used in a circuit controlling a DC electric motor? -
ANSWER...The initial current flowing into a DC electric motor is much higher than the current
the motor uses after the armature begins to rotate. Because of this high inrush current, the
controlling switches must be derated.
What is used as the rectifier to produce direct current in a DC generator? - ANSWER...Brushes
and a commutator.
How does a vibrator-type voltage regulator control the output voltage of a DC generator? -
ANSWER...The strength of the magnetic field produced in the voltage regulator relay is
proportional to the generator output voltage. When the voltage rises above the regulated value,
, the relay pulls the contacts open and inserts a resistor in the generator field circuit. The contacts
vibrate open and closed, putting the resistor in and out of the field circuit to control the amount
of voltage the generator produces.
What is meant by paralleling the generators of a twin-engine aircraft? - ANSWER...Adjusting
the voltage of the generators so they will share the electrical load equally.
What is meant by flashing the field of a DC generator? - ANSWER...Restoring the residual
magnetism to the frame of a generator by passing battery current through the field coils in the
same direction it flows when the generator is producing current.
What kind of rectifier is used in a DC alternator of the type that is used on most of the modern
light airplanes? - ANSWER...A full-wave, three-phase rectifier made up of six silicon diodes.
What is the main advantage of a horizontally opposed engine over a radial engine for powering
modern aircraft? - ANSWER...The horizontally opposed engine has a much smaller frontal area
and is easier to streamline than a radial engine.
How many throws are there in the crankshaft of a six-cylinder horizontally opposed engine? -
ANSWER...Six.
What kind of connecting rod arrangement is used in a radial engine? - ANSWER...A master rod
connects the single throw of the crankshaft with a piston. All of the other pistons are connected
to the master rod with link rods.
Of what material are most piston rings made? - ANSWER...Gray cast iron.
What is the reason for using hydraulic valve lifters in an aircraft engine? -
ANSWER...Hydraulic valve lifters keep all of the clearance out of the valve operating
mechanism. This decreases the wear of the valve train components.
At what speed does the camshaft turn, relative to the crankshaft speed in a horizontally opposed
engine? - ANSWER...The camshaft turns at one half of the crankshaft speed.
What kind of main bearings are used in a horizontally opposed engine? - ANSWER...Steel-
backed, lead-alloy bearing inserts.
On what stroke is the piston of a reciprocating engine when the intake valve begins to open? -
ANSWER...On the exhaust stroke.
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