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