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Question 1: For which position of the excitation rheostat the speed is increasing for which position...

Question 1: For which position of the excitation rheostat the speed is increasing for which position it is decreasing?

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Answer #1

From the above circuit diagram, we are able to conclude that if we wish to increase the speed of the shunt motor, we are going to vary the field resistance. As resistance increased , the value of the field current can reduce. On weakening of field current, flux of the field will reduced ends up in increase of speed. If we wish to decrease the speed, first of all we should always keep the field resistance at minimum value and so we are going to increase the coil resistance. As armature resistance will increase, the voltage drop across armature will increase. as a result of the supply voltage is generally constant. therefore by this methodology we can affect ranges of speed and
entire phenomenon may be analyzed by using following relation:

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