Wils 2 (B)- Indicate whether the following statements are true or false and correct the false statements I-A d.c. shunt motor is running with certain load. The effect of adding an external resistance in armature circuit is to increase the motor speed F Constant spied 2- A de series motor develops a torque of 30 N.m at 4 A of load current, if the curren is increased to 6 A, the torque developed will be 67.5 N.m T 3-If the two field Windings are wound in such a manner that the fluxes produced by two always help each other, the motor is called cumulatively compound F 4-The speed of d.c series motor is decreased if the armature current is increased T 5- To solve the Commutation Problem in large machines, this can be achieved by increasi the brush width. Taxt

Q: A 240 V shunt motor has an armature current of 15 A when running at 800 rpm against full-load…

A: In this question we need to find a What resistance must be inserted in series with the armature to…

Q: A shunt DC motor is fed from a 235 V DC source. The field coil has a resistance of 116 12. The total…

A: The given magnetization characteristics is shown below. The given characteristics is at a speed…

Q: 9) If the series motor loss its load suddenly, then A. its torque goes too high B. its speed…

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Q: A100 Volt dc series motors run at 400 rpm when taking a current of 55 Amp. Armature resistance is…

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Q: If the armature current in a dc machine is 400A, what should be the current in each winding if the…

A: Note In Lap winding,  Number of pole (P) = Number of Parallel path (A) In Wave winding, Number of…

Q: de motors

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Q: 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has…

A: In this question we will draw diagram of dc shunt motor showing all  resistance,currents and…

Q: An 8-pole, 460 V shunt motor has 600 lap-wound conductor. It takes 45 A from the supply mains and…

A:

Q: A 250 V d.c. shunt motor draws 4 ampere current from mains at no load and rotates at 700 r.p.m. Find…

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Q: An increase in the torque angle a results in: O A. No change in the induced torque O B. Decreasing…

A: The solution is given below is

Q: A 400 V series motor has a field resistance of 0.02 ohm and an armature resistance of 0.1 ohm. The…

A: It is given that: IL1=Ia1=30 AN1=1000 rpmRse=0.02 ΩRa=0.1 ΩVt=400 VRsh=0.03 ΩT2=0.6T1

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.