The transformer works on :________________

The magnetic core of a transformer is made of : ________________

The main functions of transformer are :________________

The single phase transformer consists of : ________________

The coil which connected to power supply at transformer is called :________________

The coil which connected to load at transformer is called :___________

The types of magnetic core construction of transformer are :__________

Step up transformer has :________________

Step down transformer has :________________

Step up transformer has :________________

Step down transformer has :________________

It is the ratio of the primary number of turns to the secondary number of turns is called :________________

It is the ratio of the primary voltage to the secondary voltage, it's called :_______

It is the ratio of secondary current to the primary current, it's called :__________

The output power at transformer always lower than the input power because of :________________

The losses of the transformer are :________________

The losses which caused due to the resistances of the primary and secondary coils :________________

The losses which caused due to the primary and secondary flux leakage :________________

The iron core losses are :________________

The auto-transformer has :________________

In an ideal transformer :________________

The current transformer is used to measure :________________

The voltage transformer is used to measure :________________

The core of transformer is made up of laminated iron core :_________

The types of instrument transformer are :________________

The types of 3 phase transformer are :________________

The methods which we can use to connect 3 phase transformer coils are :______________

The losses which caused due to changes of magnetic flux :___________

The main advantage of three single phase transformer is :___________

The main advantages of single three phase transformer are :_________

The single phase transformer has :________________

The three phase transformer has :________________

It is used to check the transformer coils against open and short circuit faults :________________

It is used to check the transformer windings against ground fault :________________

It is used to check the insulation of the transformer :_____________

The insulation resistance between the core and the windings should not be :_____________

At ground test of transformer (zero reading on the ohmmeter )indicates :___________

At ground test of transformer (infinity reading on the transformer ) indicates :_______________

At continuity test of transformer (zero reading on the ohmmeter )indicates :___________

At continuity test of transformer (infinity reading on the ohmmeter )indicates :________________

At continuity test of transformer (equal reading on the ohmmeter )indicates :________________

The methods for cooling of the three phase transformer are :_______

KVA capacity , Frequency and voltage rating are items normally stated on :________________

At the transformer wires are covered with varnished cotton on a paper strip for :________________

An ideal transformer has a step up voltage ratio of (1 : 7 )if the primary voltage is 400 V , the secondary voltage is :________________

It means that the primary and the secondary coils are (Y )connection and the angle between them is (zero ):________________

It means that the primary and the secondary coils are (Δ )connection and the angle between them is 180 :________________

It means that the primary coils are (star )connection and the secondary are (delta )connection and the angle between them is + 30 : __________

It means that the primary coils are (delta )connection and the secondary are (star )connection and the angle between them is - 30 :_____

It is dangerous when used to supply low voltage from high voltage :________________