Electrical Test Flashcards
In single phase AC motors what are starting capacitors used for?
To cause a phase shift between the windings
Collision lights and position lights should or should not be connected to the same switch?
No
Is the rotor in the ac induction motor connected to an external circuit electrically?
No
Are automatic circuit breakers used on Aircraft?
No
Conduit and dusting cables with talc reduce …..?
Potential damage
Synchronous AC motor speed by frequency of current
The motor speed is determined by frequency of input current
What type of wire terminals?
Ring type not U type
In motors, the counter EMF ___ the applied EMF
Opposes
How are volt meters connected?
Parallel to load
In AC electric motors friction in bearings cause
Cause power loss
normal rating x derating factor (high inrush current)
Derated switches used with high inrush current
Aircraft electrical strand-ed wire is more ____ and less ____
More flexible / less fatigue
Universal motor AC / DC use grommets ___ or less from ___
3/8 “ or less from edge
Wire bundles ____” min from ____ ____
1/2 inch min from control cables
How are amp meters connected?
In series
Motor brakes are applied by a ___ which is released by ____
Spring / released by magnet
Residual voltage is caused by __
Magnetism in field shoes
Type of test equipment (LED readout) :
B.I.T.E (built in test equipment) types of BITE: avtosyn, magnesyn, selsyne
In electric motors the ___ reverses the ____ of input current.
The communtator reverses the polarity of input current
In electric generator, the _____ reverses the polarity of ___ current
The communtator reverses the polarity of output current
Dc motor rotation reversed by
Changing the polarity of field of armature
____ disengage motor from load
Clutches
Reversible split field motor means it has ____sets of field windings (spdt?)
2 sets of field windings Single Pole Double Throw
Junction box in fire zone is composed of what metal
Stainless steel
What stud size used for electrical terminal strip
Size #10 stud
Which are put in series and which are put in parallel:
Rheostat
Switch
Potentiometer
Position lights
In series: rheostat / switch
In parallel: potentiometer / position lights
What is used to protect from too much current?
Circuit breakers
Intermittent duty means less than ___ min
2 minutes
Wire identifying codes are :
Identifying marks printed every 15 inches
Megometer used to measure ___ resistance
High resistance
Compound motor operates the
Hydraulic pump
Diode checking when disconnected from
Disconnected from circuit
Switch nominal rating when
Contacts closed
____ spray cools the generator
CSD OIL SPRAY
How many splices per segment
1 for every 2 terminals
Current limiter reduces generator voltage when
Safe current load is exceeded ( Prepware says can take overload for short period )
A conduit is used for ___
Mechanical protection
Transformers are used for
Step up / step down AC voltage
An AC induction motor slip has percent difference in
Speed of stator and rotor fields
What prevents radio interference
(BRASS) Conduit
Conduit has no end fittings it has
Flared ends
What can be used for circuit protection
Current limiters / fumes / circuit breakers
Wire selection criteria based on
Current capacity and voltage drop
What are the color codes and their respective wire size (used for crimp terminals)
22-18 RED
14-16 BLUE
10-12 YELLOW
An amp meter in generator output lead with no current limiter gives you the ______ rating
100% of generator rating
Derating factor is used to
Obtain a reasonable switch efficiency and service life
What are the colors of aircraft position lights
White = tail
Red = left
Green = right
Can wires be under flammable fluid lines?
NOOOO must be OVER
Stator is ___ in armature
Stationary in armature
