Explain briefly in one(1) sentence what is the function of the squirrel cage winding in the operation of the synchronous motor.
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Explain briefly in one(1) sentence what is the function of the squirrel cage winding in the operation of the synchronous motor.
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- Explain the different methods of breaking DC MotorsDEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A, B and C) depending on the topic. 1. SYNCHRONOUS MOTORS A. What is necessary to start a synchronous motor to rotate from standstill? Describe the process. B. What is meant by synchronous condenser? C. Why is it possible for synchronous motors be used as a power factor correction device and what applications do synchronous motors commonly used? Describe the operation.1. A three phase, 10 pole, 60 cycle IM has a full load slip of 0.075. What is the speed of: a. the rotor relative to the revolving field? ( 54 RPM) b. the revolving field relative to the stator? ( 720 rpm)
- 14. Under line voltage control of induction motor the speed regulation occurs: a) by change of the slip of the motor. b) by change of the synchronous speed of the motor. c) by adding additional resistance in the rotor circuit. d) by changing the stator resistance of the motor.Explain a synchronous motor. How is speed controlled? How is movement startedWhat are the effects of slip in the slip-ring induction motor? A. No effects B. Changes the change in speed C. Changes the rotor frequency D. B and C
- In a synchronous motor, a decrease in the torque angle a results in: O A. No change in the induced torque O B. Increasing the induced totque; motor will speed up O C. Decreasing the load on the synchronous motor O D. None of the other choices are correct O E. Decreasing the induced torque; motor will slow downSkewing of rotor conductors in a squirrel cage induction motor reduces a. heat developed while rotating b. friction while rotating c. humming noise while rotating d. Vibrations while rotating7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th contact drop per brush is 1V. then the full-load speed of the motor is -- a) 675 r.p.m. b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,
- What is the factor that enables the synchronous motor to operate at different electrical load characteristics? explain.Skewing of rotor conductors in a squirrel cage induction motor reduces a. heat developed while rotating b. Vibrations while rotating c. friction while rotating d. humming noise while rotating1.The other possible methods of starting 3-phase induction motors. 2.How it was made sure in the control circuit that star and deltacontactors cannot operate simultaneously?3. Why we do not have the motor continue running in its star connection. 4. What is the relationship between star and delta currents?
