4. e principle of operation of a 3-phase. Induction motor is most similar to that of a (a) synchronous motor (b) DC motor (c) transformer with a shorted secondary (d) SPIM 5. 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be (a) 0.01 (b) 0.02 (c) 0.03 (d)0.04 6. A centrifugal switch is used to disconnect 'starting winding when motor has (a) picked up about 50 to 75 per cent of rated speed (b) picked up about 10 to 15 per cent of rated speed (c) run for about 1 minute inutes

4. e principle of operation of a 3-phase. Induction motor is most similar to that of a (a) synchronous motor (b) DC motor (c) transformer with a shorted secondary (d) SPIM 5. 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be (a) 0.01 (b) 0.02 (c) 0.03 (d)0.04 6. A centrifugal switch is used to disconnect 'starting winding when motor has (a) picked up about 50 to 75 per cent of rated speed (b) picked up about 10 to 15 per cent of rated speed (c) run for about 1 minute inutes

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

At standstill condition , the slip of induction motor is 1. Select one: O True O False
transformer has single magnetic circuit. The synchronous speed of the three-phase induction motor decreases with increasing the number of poles on the stator. Select one: True False
A 3-phase, 50-Hz, induction motor draws 50 kW from the mains. If the stator losses are 2 kW andthe rotor e.m.f. is observed to make 100 complete oscillations/ alternations per minute, determine:(a). Rotor copper loss (b). Gross mechanical output.
A) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating tr) magnetic field make in one cycle of the electrical current? a) one b) 60 c) 3600 d) none of the above
a) The rotor power output of a 3-phase induction motor is 15 kW and the corresponding slip is 4%. The rotor copper loss will be..
(B)-ndicate whether the following statements are true or false and correct the faise statements. -When a series d.c. motor is operate without load, the armature will not run. The strength of magnetic field in d.c. shunt generator can be varied by varying the polarity of the field poles The main disadvantage of series generators is Output voltage varies as the Toad varies There is no output from the transformer under short-circuit conditions
Identify statement below if its true or false. Statement I. An induction motor can be treated as a rotating generator i.e. one in which primary winding is stationary but the secondary is free to rotate. Statement II. As the load of an induction motor increases the speed decreases. Statement III. Induction motors are available only in three-phase system.
3.4 The rotor power output of 3-phase induction motor is 15 k. The rotor copper losses at a slip of 4% will be (a) 600 W (c) 650 W (b) 625 W (d) 700 W
A three-phase star-connected alternator working at 1400 KVA,50 Hz, 2300 V, has an armature dc resistance of 0.15 2. Assume the ac resistance is 1.4 times the dc resistance. A field current of 75 A produces a short circuit current of 360 A and for the same field current the open circuit voltage is 1000 V. Determine a) Synchronous reactance of the machine b) Full load regulation at 0.9 leading c) Power angle a) b)
State the types of induction motor