Neglecting all losses, the developed torque (T) of a DC separately excited motor, operating under constant terminal voltage, is related to its output power (P) as under
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Two DC series motors connected in series draw current I from supply and run at speed N. When the same two motors are connected in parallel taking current I from the supply, the speed of each motor will be
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In flux control method the speed of DC motor is obtained _____
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A short shunt compound generator supplies a load current of 100 A at 250 V
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The method of speed control of DC Shunt motor is used for applications where a very wide range sensitive speed control is required is
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A 4 pole, lap wound d.c motor has 540 conductors and 230 V supply. The armature resistance is 0.8Ω. Its speed found to be 1000 r.p.m. the flux per pole is 25 mWb. The Induced e.m.f.and Armature current will be
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In very large d.c. motors with severe heavy duty, armature reaction effects are corrected by
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Interpoles in a DC motor must be
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A 440-V shunt motor has armature resistance of 0.8 Ω and field resistant 200 Ω. What will be the back e.m.f when giving an output of 7.46 kW at 85 percent efficiency
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In a d.c. motor, the brushes are shifted from the mechanical neutral plane in a direction opposite to the rotation to
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A 4 pole d.c motor takes a 50 A armature current. The armature has lap connected 480 conductors. The flux per pole is 20 mWb. Calculate the gross torque developed by the armature of the motor.
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The torque developed by a d.c motor is directly proportional to
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