00:01
In this question, the load is unchanged when we change the rotor speed and the load torque is directly proportional to the armature current because field current is constant.
00:11
Thus, we can say that by changing the rotor speed, current remains the same.
00:15
Let's understand it with a circuit.
00:18
Positive negative terminals, register negative.
00:28
The direction of current positive to negative, register 0 .10 ohms.
00:35
So, first let's see case 1.
01:00
It is given that n is 1200, current is 200 amperes and voltage 125 volt by kvl e -irh which is 2 pi times 1200 by 60 minus 200 amperes.
01:57
The current minus resistance 0 .1 ohms 0 .1 which turns 125.
02:04
The voltage is 125.
02:09
So, the ke5 turns out to be 2 pi times 1200 volt by 60 is equal to 125 plus 20.
02:24
Ke5 is equal to 145 times 60 whole by 2 pi times 1200.
02:41
Ke5 is equal to 87 times 24 pi...