Three phase transformer has................. Terminal

The single phase transformer has ………………. Coil

The coil which connected to load in transformer Name ……………. Coil.

The coil which connected to power supply in Transformer name ………. Coil

the main parts of a synchronous generator

The correct tool to be used to replace the bearing of a motor is

Find the number of poles required on the rotor of generator whose output frequency is 50 HZ if ns=3000 R.P.M______

At what speed must be rotor of generator rotate to generate 50 HZ power in a four pole machine _____

The purpose of excitation …………..

The relationship between speed, frequency and number of poles.

The formula for voltage regulation is.......

Three-phase induction motor is_________

The ratio of the number of turns of the primary winding to the number of turns of the secondary winding is known as …………………..

.................is the ratio of output power to the input power

................. is the ratio of slip speed to the synchronous speed

The Losses in a three-phase induction motor are.................

Reverse the direction of rotation of three-phases Induction motor by_____

the main advantage of three single phase transformer

State three advantages for using single three phase transformer

We use ……………. for Testing the transformer windings against open faults.

We Say the transformer have short When the resistance of coil terminal equal

the transformer have open When the resistance of coil terminal equal

VL1 it means

We use ……………. for Testing the transformer windings against Insulation faults.

the transformer has Insulation faults When the resistance between two coil terminal equal

We can connect the primary and secondary three phase transformer at

Hysteresis losses and Eddy current losses it called

it is a applications of 3phase induction motor

Transformers can be connected together in

The auto transformer has …………

The losses of transformer are

One of these methods NOT use for cooling the transformer

One of the conditions for connecting transformers in parallel.

in 3 phase transformer the losses power (PL)=

If Nph1=200 turns And the Nph2=100 turns calculate the turns ratio (a)

A 12 pole 50 Hz induction motor has 4% slip(S) find the rotor speed

A 12 pole 50 Hz induction motor has 4% slip(S) find the rotor frequency(Fr)

4pole , 415 volt,50Hz, 1450 rpm 3-phase induction motor calculate slip speed of rotor Nslip

4pole , 415 volt,50Hz, 1450 rpm 3-phase induction motor calculate the perunit slip (S)