题目内容

A Y connected balanced impedance has value ZY=5+j30Ω. Convert this to an equivalent Δ connected impedance and the impedance ZΔ is( )。

A. 5+j30Ω.
B. 30+j5Ω.
C. 15+j90Ω

查看答案
更多问题

A transformer has reactance 0.25 pu given on a 230 kV, 75 MVA base. The reactance on a 345 kV, 100 MVA base is ( )。

A. 0.15 pu.
B. 0.20 pu.
C. 0.12 pu.

Which answer only lists renewable energy sources?( )

A. Wind, Solar, Hydro
B. Solar, Coal, Wave
Coal, Wind, Solar
D. Hydro, Nuclear, Tidal

Which tests are used to find the parameters of an INDUCTION MACHINE?( )

A. No load test, blocked rotor test
B. Open-circuit test, short circuit test
C. No load test, short circuit test

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

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

答案查题题库