Dalton Walls asked 3/12/2018 The _______-wound motor is a DC motor type that contains fine wires in its field windings and has good speed control under varying loads. A. series B. shunt C. compound D. combination?
Dalton Walls asked 3/12/2018 What part of a motor's armature is in direct contact with the brushes? End of exam A. The end bell B. The commutator C. The case D. The interpole
Dalton Walls asked 3/12/2018 Which of the following DC motors acts as a form of electrical ratchet? A. Servo B. Permanent-magnet C. Stepper D. Syncro
Dalton Walls asked 3/12/2018 If an SCR in a DC motor controller is triggered late in its cycle, the result will be A. fast motor rotation. B. irregular motor rotation. C. no motor rotation. D. slow motor rotation?
Dalton Walls asked 3/12/2018 The electrical load requiring power from a DC generator is connected to the generator's A. shunt field. B. series field. C. core. D. armature?
Dalton Walls asked 3/12/2018 Where is an interpole typically located in a DC motor? A. Overlaying each alternate armature winding B. As a single loop over each field pole C. Between the field poles D. At the end of the armature
Dalton Walls asked 3/12/2018 The round device made up of copper segments and located on a DC motor's armature is the A. field pole. B. armature winding. C. commutator. D. rotor?
Dalton Walls asked 3/12/2018 What happens when the speed of a generator's armature increases? A. The field current reverses B. The induced voltage increases C. The load decreases D. The windage loss decreases
Dalton Walls asked 3/12/2018 Which one of the following losses results from the steel of the armature behaving as a conductor? A. Stray load losses B. I2R losses C. Eddy current losses D. Contact load losses
Dalton Walls asked 3/12/2018 What is the efficiency of a DC generator that requires 100 watts of energy to supply 80 watts of output power? A. 12.5% B. 125% C. 8% D. 80%
Dalton Walls asked 3/12/2018 Which of the following DC motors provides the highest starting torque? A. Generator-wound B. Shunt-wound C. Compound-wound D. Series-wound
Dalton Walls asked 3/12/2018 To get better commutation in a DC generator, you should move the brushes A. in the direction of field polarity. B. against the direction of field strength. C. in the direction of rotation. D. against the direction of rotation?
Dalton Walls asked 3/12/2018 Which of the following devices did older DC motor speed controllers often use to control armature voltage? A. A rheostat B. A battery C. A potentiometer D. A diode
Dalton Walls asked 3/12/2018 Which of the following methods can be used to cut down on brush sparking in a DC generator AConnect commutating coils in parallel with the armature coils. BInstall interpoles in the armature core. CInstall compensating coils in the field pole faces?
Dalton Walls asked 3/12/2018 If the power output of a generator is 70 kW while its power loss is 10 kW, what is the generator efficiency? A. 67.5 percent B. 75.4 percent C. 87.5 percent D. 90.2 percent
