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

<上一题 目录 下一题>
热门 试题

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
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
相关试题