By Surendra | June 11, 2020 0 Comment 0% 0 Created by Surendra 3 Phase Induction Quiz in English Set 1 All Important Question Answers for Electrician Related Exams 1 / 20 Stepless speed control of induction motor is possible by which of the following methods ? None of the above Changing the number of poles Cascade operation E.M.F. injection in rotor circuit 2 / 20 The maximum torque in an induction motor depends on frequency rotor inductive reactance all of the above square of supply voltage 3 / 20 The injected e.m.f. in the rotor of induction motor must have high value for the satisfactory speed control zero frequency the same frequency as the slip frequency the same phase as the rotor e.m.f. 4 / 20 For which motor the speed can be controlled from rotor side ? Both and (2) Squirrel-cage induction motor None of the above Slip-ring induction motor 5 / 20 The shaft of an induction motor is made of stiff flexible any of the above hollow 6 / 20 Which of the following component is usually fabricated out of silicon steel ? Bearings None of the above Shaft Stator Core 7 / 20 In the circle diagram for induction motor the diameter of the circle represents running torque line voltage slip rotor current 8 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type star connected only delta connected only none of the above and both 9 / 20 The frame of an induction motor is usually made of cast iron bronze aluminium silicon steel 10 / 20 The speed of a squirrel-cage induction motor can be controlled by all of the following except changing number of poles reducing supply voltage changing winding resistance changing supply frequency 11 / 20 Size of a high speed motor as compared to low speed motor for the same H.P. will be bigger same smaller any of the above 12 / 20 The shaft of an induction motor is made of stainless steel high speed steel cast iron carbon steel 13 / 20 A double squirrel-cage induction motor has two parallel windings in stator two series windings in stator two rotors moving in oppsite direction two parallel windings in rotor 14 / 20 A 3-phase induction motor stator delta connected is carrying full load and one of its fuses blows out. Then the motor will continue running without any harm to the winding will continue running burning its two phases will stop and carry heavy current causing permanent damage to its winding will continue running burning its one phase 15 / 20 When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered in series in series-parallel in parallel in parallel with stator 16 / 20 DOL starting of induction motors is usually restricted to high horsepower motors high speed motors low horsepower motors variable speed motors 17 / 20 The crawling in the induction motor is caused by high loads harmonics developed in the motor improper design of the machine low voltage supply 18 / 20 In medium sized induction motors the slip is generally around 0.14 0.004 0.04 0.0004 19 / 20 Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ? By injecting e.m.f. in the rotor circuit By operating two motors in cascade By changing the number of stator poles Rotor rheostat control 20 / 20 In case of the induction motors the torque is inversely proportional to (Vslip) inversely proportional to slip directly proportional to slip directly proportional to (slip)2 कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। NameEmailPhone NumberDistrictSchool/Coaching Name Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
