Electrical Test Flashcards
(49 cards)
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
