Help needed. Not sure about answers explain if you can.
While starting a dc shunt motor,
Vt=Ea+Rala @ Vt=Ea+(Ra+RsIa O Vt=Ea-Rala OVt=Ea+Rala+RsIL
Reduced armature voltage Va and reduced field voltage V
Rated Va and rated Vf should be applied and Rr should be zero
Rated Va and rated VI should be applied and Rr should be maximum
A 230V DC series generator is driven at its rated speed. The no-load voltage across its armature terminals would be 230V O somewhat more than 230V* somewhat less than 230V 6V
A 230V DC series generator is driven at its rated speed. The no-load voltage across its armature terminals would be 230V O somewhat more than 230V* O somewhat less than 230V 6V
In a loaded dc motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will OImprove and the speed falls
n10u
run in the direction of the rotating field
O Deteriorate and the speed rises
@ run against the direction of the rotating field
@ Deteriorate and the speed falls
@ improve and the speed rises
The flux is maximum in the following part of a dc motor Pole core Under the interpole Under leading pole tip O Under trailing pole tip
a 3 phase 4 pole wound rotor. When fed with normal supply, the machine will uou
@ run at very low speed
O run at slightly higher than normal speed