2. How many poles does a synchronous motor have if it operates at 200 rpm when connected to a 60-cycle source?
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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 turnA 3-phase synchronous machine with 6 pole pairs per phase is driven from a 120 V, 69 Hz AC supply. What is its synchronous speed? Give your answer in rpm to the nearest whole number.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
- 9. The synchronous speed of a three-Phase induction motor depends on the number of magnetic poles in the machine and the actual speed of rotation the actual speed of rotation and the applied Voltage in RMS the actual speed of rotation and number of magnetic poles intensity on the rotating magnetic field and the applied Voltage in RMS frequency of the applied voltage and the number of magnetic poles in the machinewhat is the conclusion for the concepts of rotating amature and rotating field in an alternator?QUESTION 13 A 220-V, three-phase, two-pole, 50 Hz induction motor is running at a slip of 5% (s-0.05) Find the speed of the rotor in revolutions per minute a 320 revimin b. 2000 rev/min O 50 revimin d. 1850 rev/min e. 740 rev/min Of 3000 rev/min g 150 rev/min Ch. 2850 rew/min
- Why do we need to have brushes in a squirrel-cage rotor type induction motor? (short answer)A 5-hp four-pole 60-cycle three-phase induction motor with a wound rotor draws 4,590 watts from the line. What is the speed of this motor when delivering 4.95 hp, if the core loss is 250 watts, the stator copper loss is 390 watts, and the friction and windage loss is 70 watts?23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -
- why the slip of induction motor is never zero.K-1)The speed of a 3-phase wound-rotor induction motor can be changed by varying the amount of resistance in the rotor circuit. a) true b) false K-2). Which of the following statements are true about a 3-phase synchronous motor? a) It is a constant speed motor even under varying loads. b) It runs at the same speed the magnetic field rotates on the stator. c) It can correct its own, and the supply line's power factor d) all of the above K-3. A) What determines the speed of a 3-phase synchronous motor? a) the number of poles b) the frequency of the supply c) both "a" and "b" d) neither "a" nor "b" K-3)B) From a technician's standpoint, which of the following is the most practical method of providing a wide range of speed control for a 3-phase synchronous motor? a) by changing the frequency b) by changing the number of poles c) both "a" and "b" d) neither "a" nor "b"A three-phase, 60 Hz induction motor operates at a slip of 2.5% and a speed of 1170 RPM. a. What is the synchronous speed of this motor? b. How many poles does this motor have?