A 3-4 induction motor is wound for 4 poles and is supplied from 50-Hz system. Calculate: A. the synchronous speed B. the rotor speed, when slip is 4% and C. rotor frequency when rotor runs at 600 rpm
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- A three –phase, 440V, 50 Hz, 6 – pole induction motor running at 950 rpm takes 50 kW at certain load. The friction and windage loss is 1.5 kW and the stator losses = 1.2 kW. Determine the output from the rotor. (a). 42.68 kW (b). 46.48 kW (c). 48.80 kW (d). 44. 86 kW4) It is advisable to avoid line-starting of induction motor and use starter because: A. motor takes five to seven times its full load current B. it will pick-up very high speed and may go out of step C. it will run in reverse direction D. starting torque is very high E. starting speed is very high 5) In a three-phase induction motor, the number of poles in the rotor winding is always: A. zero B. more than the number of poles in stator C. less than number of poles in stator D. equal to number of poles in stator E. two 6) DOL starting of induction motors is usually restricted to: A. low horsepower motors B. variable speed motors C. high horsepower motors D. high speed motors A. variable torque motors0-4:-A three phase induction motor has 4-pole runs at 1440 rpm on 500 V, s0 Hz. The mechanical power developed by the rotor is 20.3 hp. The mechanical losses are 2.23 hp. Determine (a) the slip (b) the rotor copper losses, and (c) the efficiency.
- 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"The frequency of the supply to the stator of an 8-pole induction motor is 50 Hz and the rotor frequency is 3 Hz. Determine the slip, and the rotor speed.L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no
- A three – phase 400 V, 50 Hz induction motor has a speed of 900 rpm on full – load. The motor has six poles. How many complete alternations will the rotor voltage takes per minute? (a). 30 (b). 60 (c). 300 (d). 6009. 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 machineWhich of the following statements about three-phase induction motor is false (A) The speed of rotation of the magnetic field is called the synchronous speed. (B) A three-phase supply connected to the rator produces a rotation magnetic field. (C)The rotating magnetic field has a constant speed and constant magnitude. (D) It is essentially a constant speed type machine.