Why is a capacitor needed for a single-phase motor?
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Why is a capacitor needed for a single-phase motor?
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- 1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turnWhat is a single - phase induction motor? How does a single- phase induction motor work? How do you test a single phase motor? Which capacitor is used in single phase motor? What are the advantages of single phase induction motor? What are the applications of single phase induction motor? How does an induction motor start? What are the differences between single and three phase I.M ? What are the types of induction motor? What is the difference between induction motor and normal motor? Why three-phase induction motor self start while single phase motor does not self start?Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction motor? Explain your answer.
- Name three factors that determine the torque produced by an induction motor.T-a. The direction of rotation of a single-phase split-phase motor can be change by........ a) reversing the connection of the start winding b) reversing the connection of the run winding c) reversing the connection of the start and run winding at the same time d) "a" or "b", not "c" T-b. Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about__________ time per hour. a) 8 b) 12 c) 24 d) none of the above T-c. When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with__________ . a) a smaller one b) one of the same size c) a larger one d) none of the aboveArmature reaction in an alternator primarily affects: A: rotor speed B: terminal voltage per phase C: frequency of armature current D: generated voltage per phase
- Armature reaction in an alternator primarily affects rotor speed terminal voltage per phase frequency of armature current generated voltage per phase6- Which of the following supply is given to the rotor winding of 3-Phase Induction Motor: a) DC Supply b) AC Supply c) No Supply d) Pulsating Supply 7- 3-Phase Induction Motor will have Starting Torque and Starting Current a) High, High b) Low, Low. c) High, Low d) Low, High 8- Which of the following method is used for controlling the speed of an induction motor: a) Changing number of stator poles b) Supply voltage control c) Frequency control d) All the options are correct 9- Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor: a) Star-Delta Starting b) Line resistor startling c) transformer Starter d) Rotor Resistance Starting 10- The rotor of a stepper motor has no: a) windings b) commutator c) brushes d) all of the abovewhat are the three major types of split phase motors?
- i need the answer quicklyA-1)- a- Which of the following is/are a general class of single-phase split-phase motor? a resistance-start induction-run b capacitor-start induction -run c) capacitor-start capacitor-run d) all of the aboveb-The single-phase split-phase motor operates on the principle of a rotating magnetic field. a) true b) false c- The voltages in a 2-phase power system are_______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above d-The voltages in a 3-phase power system are______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above e- Which of the two stator windings used on single-phase split-phase motors is made up of smaller wire? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b"a. Explain how a rotating magnetic field is produced in a three-phase induction motor. b. Explain the rotor action on a three-phase squirrel cage motor when the load increases from NO-LOAD to rated FULL- LOAD
