题目内容

Calculate the turns ratio for a 200 MVA, 20/220 kV transformer.( )

A. 0.20
B. 0.15
C. 0.12
D. 0.09

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Which of the following faults is an SYMMETRICAL or BALANCED fault? ( )

A. Phase to ground
B. Three phase to ground
C. Phase to phase
Double phase to ground

Before a generator can be connected to the infinite bus or with another running generator, the incoming generator and the infinite bus (or running generator) must be synchronized, they must have the same( )。

A. Voltage
B. Frequency
C. Phase sequence
D. Phase angle

A synchronous generator has a synchronous speed of 1000rpm and 6 poles. The frequency of the generator is ( ) 。

A. 45Hz
B. 50Hz
C. 60Hz

The symbol and units of measurement for ACTIVE power are ( )。

A. S, W
B. Q, VA
C. P, VA
D. P, W