单项选择题X 纠错
A.brushes on a commutator
B.brushes on slip rings
C.slip rings on a commutator
D.direct connections from the stator
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单项选择题
A.heat-resisting acrylic
B.heat-resisting aluminum
C.insulating varnish
D.insulating white lead
单项选择题
A.hydrogen chloride
B.calcium chloride
C.sulfuric acid
D.muriatic acid
单项选择题
A.can be reset to energize the circuit
B.should open the circuit when overloaded
C.will burn out when an over current flow develops
D.All of the above
单项选择题
A.limit
B.monitor
C.modulator
D.interlock
单项选择题
A.relative speed of the rotor poles
B.number of turns of wire in the armature coil
C.strength of the magnets used
D.output voltage
单项选择题
A.loss of residual magnetism
B.absorption of moisture in the insulation
C.insulation varnish flaking
D.dirt collecting on the windings
单项选择题
A.inductance
B.capacitance
C.resistance
D.amperage
单项选择题
A.Fan
B.Pump
C.Winch
D.Machine tool
单项选择题
A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage
单项选择题
A.diode
B.transformer
C.transistor
D.rheostat
