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Electrical Machines Practice Test: Transformers
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Avg score: 28% Most missed: “A 200/400 V single phase transformer has leakage impedance z= r+jx. Then we can …”
Transformers topics include: Transformer construction and phasor diagram, open circuit and short circuit test, voltage regulation of transformer, transformer losses and its efficiency, autotransformers, single phase transformer, three phase transformer and ideal two winding transformer. Transformers are electrical machines that convert electrical energy from one voltage level to another. They are static machines, while motors and generators are dynamic machines.  Here are some types of transformers: Ideal transformer: A static transformer that has no losses, magnetic leakage, core loss,... Show more
Electrical Machines Practice Test: Transformers
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1 Questions

1. Consider a 2-winding transformer as below. If the switch is kept open then the emf induced across the secondary having transformation ratio of ‘2’ is?
The induced emf lags the flux by 90degrees if the switch is kept open