1. a. Between a series-wound and a shunt-wound dc motor which has the greater st

Question

1. a. Between a series-wound and a shunt-wound dc motor which has the greater startup torque? b. Whaich has the better steady-speed charachteristics? 2.a. Where does most of the energy that doesn't go into rotational energy in a motor, go? b. Because of this what do some high-power DC motor feature? 3. After spin-up how does the split-phase motor disconnet power to the starter windings? 4. What are the most common wiring arrangements of polyphase AC motor? 5.a. If the following voltage pulse is being applied to a stepper motor coil to the increment the shaft, what type of driving style is being used? b. What advantage does this have as opposed to a constant-voltage pulase? 6.a. What two-pin device allwos current to flow only in one direction? b. For what application is this used? 7. What is the decimal representation of the hexadecimal number CF2^16

Explanation / Answer

1.a) The series-wound dc motor has the greater start up torque. 1.b) The shunt-wound has better steady-speed characteristics. 2.a)Most of the energy that doesn't go into rotational energy goes into loss in the form of heat. 2.b) Because of this many high-power DC motor feature certain cooling mechanisms like heavy-water cooling, hydrogen cooling, etc. 3.)It's done by the Centrifugal switch or over current relay. 4.) Delta connection. 5.a) Stepped driving style is used. 5.b)The motion of the shaft can be controlled more precisely. 6.a) A Diode 6.b) For rectification purposes. 7.) In decimal system C=12, F=15; therefore CF 2^16 = 848406

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