If the armature of shunt motor takes 16 amperes at full load, with the data given: 12-hp 1,700 rpm. 550-volt and has an armature resistance if 1.33 ohms. Assume a 3 volt brush drop calculate A. The counter emf develop Ed by the motor B. The power developed by the motor in watts C. The power develop by the motor in horsepower.

A 440 volt d.c. The armature resistance of the motor is 0.25 ohm. It takes an armature current of 60 A at 750 RPM. So find the value of torque produced in the motor.

Q1. (A)- A series DC motor runs at 600 r.p.m drawing a current of 52A when connected to 220 V supply. The total resistance of the machine is 0.14 2. Calculate the value of the external resistance to be connected in series with the motor circuit to reduce its speed to 400 r.p.m. Assume the load torque is decreased to half of the previous value. Consider the field flux is proportional to armature current.