單項選擇題Electrical leads and insulation on a motor should be painted with（）.

A.heat-resisting acrylic
B.heat-resisting aluminum
C.insulating varnish
D.insulating white lead


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1.單項選擇題The electrolyte in a lead-acid storage battery consists of distilled water and （）.

A.hydrogen chloride
B.calcium chloride
C.sulfuric acid
D.muriatic acid

2.單項選擇題A circuit breaker and a fuse have a basic similarity in that they both （）.

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

4.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

5.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