A 7.40 kW, 240-V shunt motor takes a line current of 4 A when running light. Calculate the efficiency as a motor when delivering full load output, if the armature and field resistance are 0.5 Q and 240 2 respectively. At what output power will the efficiency be maximum? Is it possible to obtain this output from the machine?

answer all parts please

A 230-V dc shunt motor takes a current of 5A at no-load. The resistance of armature and field circuits are 0.50 ohm and 230 ohm, respectively . If the maximum efficiency occurs at full load current, what is the value of this current? A 14 hp, 240 v shunt motor draws an armature current of 50 A at full-load. The armature resistance including brushes is 0.25 ohm. Calculate the total resistance of a starting box which wound permit this motor to develop a starting torque equal to twice that at full load.

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.