Top 2 awesome idea with dc motor

State the function of split ring· in d.c. motor.

(a) Suppose the windings og the armature in the d.c. motor or Example 4 connot tolerate a current of more than 20 amp. WhaT do you think will happen if the armature gets jammed and cannot rotate when the motor is connected to the supply ? (b) If the supply connection of the d.c. motor in Ex. are removed and the motor is used as a generated by connecting the shaft of its armature to an external mechanical rotor of speed 3000 r.p.m., how much e.m.f. will be generated ?

An electric motor operating on 50 volt D.C. supply draws a current of 10 amp. If the efficiency of motor is 40% then the resistance of the winding of the motor is

Which rule do you for direction of forces in d.c. motor ?

(a) Can we use AC for electroplating? (b) Can we operate an AC electric motor using DC?

A small d.c. motor operating at 200 V draws a current of 5.0 amp.at its full speed of 3000 r.p.m. The resistance of the armature of the motor is 8.5 Omega . Determine the back e.m.f. of the motor. Obtain the power input, power output and efficiency of motor.

The armature of a dc motor has 20 Omega resistance It draws a currrent of 1.5 A when run by a 220 V dc supply The value of the block emf induced in it is .