WorksheetsQuiz transformer3
Total questions: 10
Worksheet time: 5mins
The transformer core is made of _____ material.
Copper
Plastic
Ferromagnetic steel
Aluminium
Which of the following is a magnetic loss?
Eddy current
Copper
Load
Mechanical
A transformer works only on _____ current.
Direct
Alternating
Pulsating DC
Static
In an ideal transformer, all the flux links both windings.
True
False
If a transformer has 500 turns on primary and 50 on secondary, it is a _____ transformer.
Step-up
Step-down
Isolation
Three-phase
The current in the secondary depends on _____.
Voltage ratio
Load connected
Power factor only
Frequency only
The open-circuit test is performed on the _____ winding.
High-voltage
Low-voltage
Either side
Secondary only
Voltage regulation occurs because of _____.
Internal impedance
Frequency variation
Temperature
Core thickness
The efficiency of a good transformer is usually _____.
20–30%
40–60%
80–90%
Above 95%
When load current increases, the secondary voltage usually _____.
Increases
Decreases
Constant
Zero
