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