單項(xiàng)選擇題A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter methodTherefore, the meters should be connected with（）.

A.both meters in series with the resistance
B.both meters in parallel with the resistance
C.the ammeter in series and the voltmeter in parallel with the resistance
D.the ammeter in parallel and the voltmeter in series with the resistance


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1.單項(xiàng)選擇題An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an（）.

A.open circuit
B.short circuit
C.polarized ground
D.ground reference point

2.單項(xiàng)選擇題Which of the following statements represents the main difference between a relay and a contactor?（）

A.Contactors control current and relays control voltage
B.A relay is series connected and a contactor is parallel connected
C.Contactors can handle heavier loads than relays
D.Contactors are made from silver and relays are made from copper

3.單項(xiàng)選擇題Any electric motor can be constructed to be（）.

A.short proof
B.ground proof
C.explosion proof
D.overload proof

4.單項(xiàng)選擇題Current changing in direction and rising and falling in value is （）.

A.AC
B.DC
C.generator
D.fresh water generator

5.單項(xiàng)選擇題The output voltage of a three-phase alternator is regulated by the （）.

A.AC voltage to the armature
B.AC voltage to the field
C.DC voltage to the armature
D.DC voltage to the field