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【判断题】
Die Schweiz gehört weder zur EU noch zum Europäischen Wirtschaftsraum.A.
正确
B.
错误
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举一反三
【单选题】The is nothing more that an electrical transformer.
A.
ignition plug
B.
ignition coil
C.
ignition switch
D.
distributor
【简答题】A transformer(变压器) is a device based upon this effect which is used to change the voltage(电压) in an ac circuit(交流电路) from one value to another.
【单选题】The excitation resistance of the transformer is an equivalent resistance reflecting ( ).
A.
total loss
B.
short-circuit loss
C.
iron loss
D.
secondary winding loss
【单选题】Based on the principle of electromagnetic induction, the fundamental method to realize voltage transformation in a transformer is that ( ).
A.
the number of turns of the primary and secondary winding is the same
B.
the number of turns of the primary and secondary winding is different
C.
there is an electrical connection between the primary and secondary winding
D.
the primary and secondary windings are insulated from each other
【单选题】A transformer is a device that can converter one ac voltage to another ac voltage through the action of () .
A.
an electric circuit
B.
a magnetic field
C.
an electric field
D.
a coupling circuit
【简答题】A
15-kVA 7000/230-V distribution
transformer has an impedance referred to the primary of 80 + j300Ω. The
components of the excitation branch referred to the primary side are Rc = 350 kΩ and Xm = 70 kΩ...
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