Question

2. If a current of 3 Adc flows in the series field winding of your motor, what would the resultant voltage drop be?

3. If the rheostat were connected in series with the shunt field winding and the combination placed across a 120 Vdc line, what shunt field current variations could be obtained from your motor?

            I _minimum = Adc      I _maximum = Adc

4. All of the windings and even the commutator of your motor are made of copper. Why?

6. If the series field winding of your motor was connected directly across the 120 Vdc supply:

            a) What current would flow?

            b) What would the power loss be (in watts)?

            c) Is this power loss entirely given up as heat?

d) What do you think would happen to the winding if the current were sustained for a few minutes?

8. If the armature winding and the series field winding of your motor were connected in series across a 120 Vdc source, what would the starting current be?

9. In your motor, is the armature (plus brushes) resistance substantially the same for every rotational position of the armature? Explain?

Answer 1