AMT 112 prog 4 fill in the blank
Alternators used on large aircraft generally supply _____________ (how many) hertz ________________ (how many) phase alternating current
400 3
the alternating current produced in a DC alternator is changed into direct current with a ______ (solid-state or mechanical) rectifier
Solid State
If one lead from each winding of a three-phase alternator is connected to a common point, the stator is ________ connected and if the phases are connected end-to-end the stator is ________________ connected
Y or star Delta
The speed of an AC induction motor is determined by:
a. design b. applied AC frequency
identify these statements as true or false concerning the landing gear circuit shown in figure 7-64A a. all three landing gear must be down and locked before any of the down-and-locked lights will illuminate _______ b. the landing gear switch cannot be placed in the gear up position when the weight of the aircraft is on the landing gear. ______ c. if the landing gear is not down and locked, the warning horn will sound anytime the throttle is closed, regardless of the position of the landing gear switch ______ d. the pump motor cannot run in the gear up direction when the weight of the aircraft is on the landing gear _____
a. false b. false c. true d. true
the principle parts of a alternator are the:
a. rotor b. stator c. solid state rectifier d. brush assembly
three types of field-armature circuit arrangements used in DC motors are:
a. series wound b. shunt wound c. compound wound
the two basic types of large aircraft electrical bus distribution systems are the:
a. split bus b. parallel bus
the three types AC motors are the:
a. universal motor b. induction motor c. synchronous motor
Modern jet aircraft typically use an _____ cooled _____ (brush type or brush-less) alternator
air brush-less
Vibrator type voltage regulators with provisions for paralleling two generators have an extra _____________ that is connected to a paralleling switch or relay
coil
on jet aircraft a ________ ________ _______ unit is used between the engine and the alternator to assure constant frequency output
constant speed drive
the term __________ is often used to define a heavy current solenoid, such as the one used to energize the starter
contactor
series-connected DC motors have a _______ (high or low) starting torque
high
a reverse-current cutout relay _____________ (is or is not) necessary with a DC alternator
is not
on aircraft equipped with a _______ (split bus or parallel bus) systems, all generators connected to a common bus and share the load equally
parallel bus
an electrical schematic diagram shows the ________ (relationship or physical location) of all the electrical components and associated wiring in a particular system
relationship
Solid-state voltage regulators are usually ___________ (repaired or replaced) if they fail.
replaced
an aircraft starter uses a _______ (series or shunt) wound DC motor
series
Carbon brushes, riding on smooth ____________ ___________ carry the field current from the voltage regulator to the alternator rotor.
slip rings
the principle difference between DC generator and a DC alternator is that the magnetic field is _______ (stationary or moving) in a generator and _______ (stationary or moving) in an alternator
stationary moving
a ________ phase alternator is used for almost all aircraft applications
three
the only current that flows in the paralleling coils is that caused by the difference in the output ______ (voltage or current) of the two generators
voltage
a clipping diode may be installed across the coil of the master relay eliminate ____________ that could damage sensitivity electronic components
voltage spikes