The O.C.C. test of a DC shunt generator at speed 800 r.p.m. is: Field current-4 2 4. 6. 7. 8. 9. 10 Armature EMF-V 14 224 394 506 546 580 602 610 If the generator driven at speed 400 rpm, (i) Find the voltage to which the machine will excited if the field resistance is 38 f2, (ii) Find the critical speed and critical resistance, (11) It a certain load draws an amature current L = 60A, find the induced EMF and terminal voltage at that load. The armature resistance is 0.5 N, (Neglect armature reaction). %3D (iv) Find the required field resistance to increase the induced EMF to 295 V.
The O.C.C. test of a DC shunt generator at speed 800 r.p.m. is: Field current-4 2 4. 6. 7. 8. 9. 10 Armature EMF-V 14 224 394 506 546 580 602 610 If the generator driven at speed 400 rpm, (i) Find the voltage to which the machine will excited if the field resistance is 38 f2, (ii) Find the critical speed and critical resistance, (11) It a certain load draws an amature current L = 60A, find the induced EMF and terminal voltage at that load. The armature resistance is 0.5 N, (Neglect armature reaction). %3D (iv) Find the required field resistance to increase the induced EMF to 295 V.
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Transcribed Image Text:The O.C.C. test of a DC shunt generator at speed 800 r.p.m. is:
Field curren-4
4
9.
10
Armature EMF-V
14
224
394
506
546
580
602
610
If the generator driven at speed 400 rpm,
(i)
Find the voltage to which the machine will excited if the field resistance is 38 ,
(ii) Find the critical speed and critical resistance,
(11) If a certain load draws an armature current L. = 60A, find the induced EMF and
%3D
terminal voltage at that load. The armature resistance is 0.5 N, (Neglect armature
reaction).
(Iv) Find the required field resistance to increase the induced EMF to 295 V.
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