question#1 Explain the relationship between voltage, current, and turns in a tra

Question

question#1 Explain the relationship between voltage, current, and turns in a transformer.

question#2 What would be the voltage on the secondary side of a transformer with a 400:20 turns ratio and a primary voltage of 6000 Volts?

question#3 What is the voltage per turn for the primary transformer in Question 2?

question#4 Explain the difference between a synchronous and an asynchronous machine.

question#5 Determine the frequency of a machine that has 4 poles and a speed of 3000 RPM.

question#6 Explain how a DC motor works.

Note: please type the answer( if you cannot type, do not answer please)

Explanation / Answer

1)

we know transformation ratio in a transformer

K=(N2/N1)=(V2/V1)=(E2/E1)=(I1/I2).

2)

N2/N1=20/400=0.05

SECONDARY SIDE VOLTAGE=0.05*6000=300 VOLTS.

3)

VOLTAGE/TURN=6000/400=15.

4)

SYNCHRONOUS MACHINES ROTATES AT CONSTANT SPEED.

BUT ASYNCHRONOUS MACHINES ROTATES AT VARIABLE SPEED.

5)

Ns=(120*f)/P

f=(Ns*P)/120=(3000*4)/120=100 HZ.

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