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WorksheetsQuiz Transformer 1
Total questions: 10
Worksheet time: 5mins
A transformer supports energy transmission over distance:
Change DC to AC
Support energy transmission over distance
Increase frequency
Convert electrical to mechanical energy
A transformer that increases voltage:
Step-down
Step-up
Auto-transformer
Booster coil
Step-down transformer function:
Reduce voltage
Increase voltage
Store energy
Change frequency
Transformers mainly used for:
Long-distance power transfer
Heating systems only
DC circuits only
Radio antennas only
In approximate equivalent circuits, excitation branch placed:
At the input side
At the back of the secondary
Removed
In series with the core
Excitation current is:
Very large
Very small
Same as load current
Zero
Test providing magnetising current and core losses:
Resistive test
Open circuit test
Short circuit test
Saturation test
During open circuit test, the secondary is:
Shorted
Left open
Over-loaded
Earthed only
Short circuit test determines:
Iron losses
Copper losses
No-load losses
Frequency losses
Transformers require AC because:
They need changing magnetic flux
Need constant current
Work with batteries
Use static fields
