Give reason why dc motor requires starter.

5. A stepper motor is being used as a crane motor in an expensive toy. The motor has the following properties: Holding torque = 2.52 kg -cm dynamic torque = 1.440 kg-cm detent torque = 0.360 kg-cm The motor turns a 3.81 cm diameter pulley around which a string is wound. How much weight can the crane lift? How much weight can the crane continue to support with the power on; with the power off?

15. What are the following statements are true for DC Motor? I. Motor converts Electrical Energy to Mechanical Energy II. Motor supply current to the armature winding III. Back EMF is lesser than the Supply voltage IV. Fleming's Right-hand rule a. I and II b. II and IV  c. I,II and III d. I,II and IV

Q7/ What are the advantages and disadvantages of the permanent magnets dc motors?

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1- a)The primary function of a motor of a motor is to develop a turning effect or a torque. a) true b) false 1-b)Upon what fundamental principle does motor operation depend? a) unlike magnetic poles attract b) like magnetic poles repel c) both "a" and "b" d) none of the above 1CWhich of the following is/are a component which will determine the amount of force developed on an armature conductor? a) amount of current flow in the armature conductor b) the flux density of the magnetic field c) both "a" and "b" d) neither "a" nor "b"

Explain how to drive DC Motors!

The armature resistance of a DC motor is 0.4 2, the supply voltage is 200 V and the back e.m.f. is 198 V at full speed. The armature current is

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