Transformer 2 Flashcards
It is always true that for a transformer that:
The primary turns per volt are equal to the secondary turns per volt
A transformer will not operate when supplied from a direct current supply because:
There will be no changing magnetic flux in the core to induce a secondary EMF
The transformer works on the principle of electromagnetic induction, is it:
Mutual Induction
A transformer will work on:
AC only
The losses that occur in the core of a transformer are:
Hysteresis and eddy current losses
Eddy current losses in a power transformer are minimised by:
Constructing the core with laminated layers
An ideal transformer is one which has:
No losses and no magnetic leakages
A step up transformer increases:
Voltage
The primary and secondary windings of a two winding transformer always have,
A common magnetic circuit
The main purpose of using a core in a transformer is to:
Decrease the reluctance of the common magnetic circuit
A device used to step up the voltage on the national grid is:
A transformer
Transformers are rated in which of the following units?
VA
A Transformer:
Steps up or down AC Voltages & Current
The efficiency of a power transformer is approximately
98%
The losses due to the resistance of the copper wire which are used to manufacture the windings in a transformer are called coper losses. What is another name for copper losses?
I2R losses
