單項選擇題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


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1.單項選擇題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

2.單項選擇題The Wheat-stone bridge is a precision measuring instrument utilizing the principle of changes in（）.

A.inductance
B.capacitance
C.resistance
D.amperage