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
An electrical device which prevents an action from occu...
单项选择题An electrical device which prevents an action from occurring until all other required conditions are met is called a/an （）.
A.limit B.monitor C.modulator D.interlock
The frequency output of an operating alternator is cont...
单项选择题The frequency output of an operating alternator is controlled by the （）.
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
The greatest detrimental effect on idle electrical equi...
单项选择题The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the（）.
A.loss of residual magnetism B.absorption of moisture in the insulation C.insulation varnish flaking D.dirt collecting on the windings
