Question

true or false with explanation

a- A separately excited DC generator terminal current increases as a resistive load is applied

b- In a separately excited DC generator, a voltage will exist at the terminals for a zero speed

c- Doubling the load on the generator will increase the generator voltage by a factor of two.

d- The commutator is used for adding a resistor to the rotor.

e- A rotating magnetic field is produced around the air gap.

Answer 1

O a) When load increased Torque also increases. T - dia Ta ia Torque increases Armature increases Current SO Amature current q, terminal current ↑ given state ment is "true" At speed so Load y zero Residenal voltage So c) SO at no-load Resideed voltage will Prefect. is very small vortage. at speed с. smale Voltage is present is True So given statement Eg - utiara lood increases ja is increases. SO €l go inc8eages but not doubles. So given statement is false Commutath used to convert to Ac to Dc not for adding resistance Supply in DIC machines. FAISe u is (false) 4 d В SO given Statement Produced in e) Rotating namlic field is always and DC machius. arand airgal fl all A.C SO Statement is "True.