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Electrical Machines
Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly
175 V
240 V
120 V
140 V
175 V
240 V
120 V
140 V
Answer
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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is
15.1 Ω
31.1 Ω
15.9 Ω
31.9 Ω
15.1 Ω
31.1 Ω
15.9 Ω
31.9 Ω
Answer
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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to
0.125 p.u
0.25 p.u
0.75 p.u
0.5 p.u
0.125 p.u
0.25 p.u
0.75 p.u
0.5 p.u
Answer
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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is
384 V
96 V
768 V
192 V
384 V
96 V
768 V
192 V
Answer
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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be
234 V
6 V
474 V
240 V
234 V
6 V
474 V
240 V
Answer
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