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 frame of an induction motor is usually made of aluminium bronze silicon steel cast iron 2 / 20 DOL starting of induction motors is usually restricted to high horsepower motors high speed motors variable speed motors low horsepower motors 3 / 20 Which of the following component is usually fabricated out of silicon steel ? Stator Core None of the above Shaft Bearings 4 / 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 stop and carry heavy current causing permanent damage to its winding will continue running burning its one phase will continue running burning its two phases 5 / 20 A double squirrel-cage induction motor has two parallel windings in rotor two rotors moving in oppsite direction two series windings in stator two parallel windings in stator 6 / 20 The shaft of an induction motor is made of flexible stiff hollow any of the above 7 / 20 The maximum torque in an induction motor depends on frequency all of the above square of supply voltage rotor inductive reactance 8 / 20 Size of a high speed motor as compared to low speed motor for the same H.P. will be smaller any of the above bigger same 9 / 20 In medium sized induction motors the slip is generally around 0.0004 0.004 0.04 0.14 10 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type star connected only and both none of the above delta connected only 11 / 20 In the circle diagram for induction motor the diameter of the circle represents slip rotor current line voltage running torque 12 / 20 When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered in parallel with stator in series in series-parallel in parallel 13 / 20 In case of the induction motors the torque is inversely proportional to (Vslip) directly proportional to (slip)2 directly proportional to slip inversely proportional to slip 14 / 20 For which motor the speed can be controlled from rotor side ? None of the above Slip-ring induction motor Both and (2) Squirrel-cage induction motor 15 / 20 The speed of a squirrel-cage induction motor can be controlled by all of the following except changing number of poles changing winding resistance reducing supply voltage changing supply frequency 16 / 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 Rotor rheostat control By operating two motors in cascade By changing the number of stator poles 17 / 20 The crawling in the induction motor is caused by high loads low voltage supply improper design of the machine harmonics developed in the motor 18 / 20 The shaft of an induction motor is made of high speed steel carbon steel cast iron stainless steel 19 / 20 Stepless speed control of induction motor is possible by which of the following methods ? Changing the number of poles E.M.F. injection in rotor circuit None of the above Cascade operation 20 / 20 The injected e.m.f. in the rotor of induction motor must have zero frequency the same phase as the rotor e.m.f. high value for the satisfactory speed control the same frequency as the slip frequency 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
