Question

The armature of a dc separately excited machine has a resistance of
0.102 and is connected to a 230V supply. Calculate the generated emf
when it is running (i) as a generator giving 80A (ii) as a motor taking
60A.
A

Answer 1

The generated emf when it is running as a generator= 238.16V

The generated emf as a motor taking 60A= 236.12V

Calculation of Electromotive force (emf)

The Resistance of the machine= 0.102

The connected voltage = 230V

The formula for emf; E= V +IR

The generated emf when it is running as a generator,

= 230 + (80*0.102)

= 230 + 8.16

= 238.16V

The generated emf as a motor taking 60A;

= 230 + (60 * 0.102)

= 230 + 6.12

= 236.12V

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