MR ELECTRICO 1

A series-wound dc electric motor will normally require. more current at high RPM than at low RPM. approximately the same current throughout its operating range of speed. more current at low RPM than at high RPM. high resistance will develop in stripping nicks.

A voltage regulator controls generator output by. introducing a resistance in generator to-battery lead in the event of overload. shorting out field coil in the event of overload. Series wound. varying current flow to generator field coil.

Aluminum wire must be stripped very carefully because. high resistance will develop in stripping nicks. stripping nicks can cause short circuits. individual strands will break easily after being nicked. to prevent circuit failure due to terminal disconnection.

An ammeter in a battery charging system is for the purpose of indicating the. amperage available for use. total amperes being used in the airplane. rate of current used to charge the battery. stripping nicks can cause short circuits.

For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by. crimping. soldering. crimping and soldering. Rolling.

How can it be determined if a transformer winding has some of its turns shorted together?. Measure the input voltage with an ohmmeter. The output voltage will be high. The transformer will get hot in normal operation. A high internal resistance condition.

How does the magnetic brake used to stop rotation of an electric motor armature operate. Centrifugal force releases a rotating brake cog from a stationary notch when the armature reaches a certain speed and magnetic force re-engages the cog when the electrical power is turned off. A friction brake is applied by a magnet and released by a spring. approximately the same current throughout its operating range of speed. A friction brake is applied by a spring and released by a magnet.

How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor?. Four. Three. Six. Two.

If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open. depends on the load carried by the generator. is controlled by the reverse current cutout relay point clearance. is increased when the external load is greater than the generator output. motor can be operated in either direction.

If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature. in the normal direction and through the shunt field opposite the normal direction. and the shunt field opposite the normal direction. Centrifugal force releases a rotating brake cog from a stationary notch when the armature reaches a certain speed and magnetic force re engages the cog when the electrical power is turned off. opposite the normal direction and through the shunt field in the normal direction.

One purpose of a growler test is to determine the presence of. an out-of-round commutator. a broken field lead. a shorted armature. power output of the motor can be more closely controlled.