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Standard XII
Physics
Two Parallel Currents
16. when spee...
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16. when speed of dc motor increase the armature current
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Q.
State whether True or False :
The speed of DC series motor is directly proportional to armature current.
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If the load current and flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of motor will
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When speed of a DC generator decreases, the armature current
Q.
A DC series motor gave the following open circuit curve at a speed of 600 rpm.
Field current (A)
10
20
30
40
60
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Open circuit voltage (V)
103.5
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Total resistance of armature and field circuit is 1
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. The motor is connected to 250 V supply. The speed of motor when the armature current is 40 A is________rpm.
(Neglect losses in core and friction, windage loss)
Q.
A dc shunt motor develops a torque of 20 N-m when the armature current is 40 A. If it is changed as a cumulative compound motor by adding series field, which increases 20% of flux, and the armature current is 60 A, then the developed torque is
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