24. A separately excited generator with a speed of 1200 r.p.m., supplies a load of 200 A at 125 V. What will be its new armature current if speed is changed to 1000 r.p.m. keeping field excitation constant. Assume R₁ = 0.04 2 and total brush drop of 2 V. Assume load resistance constant. = : (Ans. 166.16 A) 23. A long shunt compound generator delivers 50 A load at 500 V. Find induced e.m.f. and the armature current. Assume Ra 0.05 2. Rsc = 0.03 2 and Rsh 250 and brush drop of 1 V/brush. If flux per pole is 25 mWb with 250 number of armature conductors. Calculate speed of the prime mover. The machine has 6 poles with wave type armature winding. If same generator is connected as short shunt type, to supply same load at same voltage, at what speed it should be driven. (Ans.: 506.16 V, 52 A, 1619.71 r.p.m., 1619.52 r.p.m.) 32. A 4-pole lap wound armature running at 1500 r.p.m. delivers a current of 150 A and has 64 commutator segments. The brush spans 1.2 segments and inductance of each armature coil is 0.05 mH. Calculate the value of reactance voltage assuming i) linear commutation and ii) sinusoidal commutation. Neglect mica thickness. (Ans.: 5V, 5.53 V)
24. A separately excited generator with a speed of 1200 r.p.m., supplies a load of 200 A at 125 V. What will be its new armature current if speed is changed to 1000 r.p.m. keeping field excitation constant. Assume R₁ = 0.04 2 and total brush drop of 2 V. Assume load resistance constant. = : (Ans. 166.16 A) 23. A long shunt compound generator delivers 50 A load at 500 V. Find induced e.m.f. and the armature current. Assume Ra 0.05 2. Rsc = 0.03 2 and Rsh 250 and brush drop of 1 V/brush. If flux per pole is 25 mWb with 250 number of armature conductors. Calculate speed of the prime mover. The machine has 6 poles with wave type armature winding. If same generator is connected as short shunt type, to supply same load at same voltage, at what speed it should be driven. (Ans.: 506.16 V, 52 A, 1619.71 r.p.m., 1619.52 r.p.m.) 32. A 4-pole lap wound armature running at 1500 r.p.m. delivers a current of 150 A and has 64 commutator segments. The brush spans 1.2 segments and inductance of each armature coil is 0.05 mH. Calculate the value of reactance voltage assuming i) linear commutation and ii) sinusoidal commutation. Neglect mica thickness. (Ans.: 5V, 5.53 V)
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Author:Robert L. Boylestad
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Transcribed Image Text:24. A separately excited generator with a speed of 1200 r.p.m., supplies a load of 200 A at 125 V.
What will be its new armature current if speed is changed to 1000 r.p.m. keeping field excitation
constant. Assume R₁ = 0.04 2 and total brush drop of 2 V. Assume load resistance constant.
=
:
(Ans. 166.16 A)
23. A long shunt compound generator delivers 50 A load at 500 V. Find induced e.m.f. and the
armature current. Assume Ra 0.05 2. Rsc = 0.03 2 and Rsh 250 and brush drop of 1
V/brush. If flux per pole is 25 mWb with 250 number of armature conductors. Calculate speed of
the prime mover. The machine has 6 poles with wave type armature winding.
If same generator is connected as short shunt type, to supply same load at same voltage, at what
speed it should be driven.
(Ans.: 506.16 V, 52 A, 1619.71 r.p.m., 1619.52 r.p.m.)
32. A 4-pole lap wound armature running at 1500 r.p.m. delivers a current of 150 A and has 64
commutator segments. The brush spans 1.2 segments and inductance of each armature coil is 0.05
mH. Calculate the value of reactance voltage assuming i) linear commutation and ii) sinusoidal
commutation. Neglect mica thickness.
(Ans.: 5V, 5.53 V)
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