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Electrical Level 2 Module 2 With Questions And 100% SURE ANSWERS
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Electrical Level 2 Module 2 With Questions And 100% SURE ANSWERS
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JACKLINEElectrical Level 2 Module 2 With Questions And 100% SURE ANSWERS
Terms in this set (50)
What type of motors have excellent speed DC motors
control.
To operate a DC motor above the rated speed, a field rheostat
_____ is used to reduce the field current and field
flux.
To operate a DC motor below the rated speed, resistors
____ are used to reduce the armature voltage.
The DC series motor develops ____ of it's full-load 500%
torque at starting.
What type of motor is used in applications where DC series motor
large amounts of starting torque is needed?
Give two applications where there are high In cranes & railway applications
Electrical Level 2 Module 2
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, What type of motors are used whenever it is Compound DC Motors
necessary to obtain speed regulation
characteristics not obtainable with either the
shunt-wound or series-wound motor.
Used in applications that require high starting Compound Motor
torque and constant speed under load.
Both ___ and ___ motors operate on the principle induction, synchronous
of a rotating magnetic field.
The synchronous speed of a motor is given by
the equation:
Depending on how the ___ is wound, it may have stator
two, four, or any even number of poles.
Due to the absence of any moving electrical Squirrel Cage Rotor Induction Motor
contacts, they are suitable for use where they are
exposed to flammable dust or gas.
Used when it is necessary to vary the rotor The Wound Rotor Induction Motor
resistance to limit starting current, or to vary the
motor speed.
In a wound rotor induction motor, speed can be 50% to 75%
varied by as much as __ to __.
Because the rotor circuit heat generation is The Wound Rotor Motor
largely external to the rotor windings, this type
of motor is used for applications that require
frequent starts without overheating the motor.
The difference between the synchronous speed Slip
and the rotor speed.
The __ of a three-phase squirrel cage induction Speed
motor depends on the frequency of the applied
voltage and the number of poles.
Electrical Level 2 Module 2
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