Which of the following is an example of a manual speed controller for a wound-rotor motor? a. Variable frequency drive b. Timers/Control Relays c. SCR Controller d. Faceplate Controller

A shunt wound de motor has an armature resistance of 2.52 and a shunt field resistance of 1602. The terminal voltage is 120 volts and the line current is 8 Amperes. Back emf is developed in the armature when the motor is running considering only the copper loss. Calculate the efficiency of the motor. a. 76.937% b. 80.937% c. 84.896% d. 90.625%

I. 1. ADC shunt motor having an armature resistance of 0.25 and a brush contact volt drop of 3 V receives an applied voltage across its armature terminals of 120 V. Calculate the armature current when the speed produces an induced voltage of 110 V at a given load? a) 40 A b) 28 A c) 52 A d) 12 A

determine "A" through "G" for the DC motor on worksheet 5 when it is running at capacity and its specification are as follows rated input   125volt    16 amp armature resist.     0.3 ohms shunt field resist    50  ohm series field resist.      .6  ohm rheostat resist.        12.5   ohm   . power consumed by armature resistance   a-  54.68 W b-  312.5 W c-  1632.83 W d-  2000  W