Answer to Question #264401 in Engineering for naz

Question

A 150V, DC shunt motor drives a constant-torque load at a speed of 1500rpm. The

armature and field resistances are 2Ω and 150Ω, respectively. The motor draws a line

current of 10A at the given load.

(a) Calculate the resistance that should be added to the armature circuit to reduce the

speed by 50%.

(b) Assume the rotational losses to be 100W. calculate the efficiency of the motor without

and with the added resistance.

(c) Calculate the resistance that must be added to the armature circuit to operate the

motor at the holding condition

Answer 1

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