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 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 changing the number of stator poles By operating two motors in cascade 2 / 20 In case of the induction motors the torque is directly proportional to (slip)2 inversely proportional to slip inversely proportional to (Vslip) directly proportional to slip 3 / 20 The shaft of an induction motor is made of stainless steel carbon steel high speed steel cast iron 4 / 20 For which motor the speed can be controlled from rotor side ? Both and (2) None of the above Squirrel-cage induction motor Slip-ring induction motor 5 / 20 When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered in parallel in parallel with stator in series in series-parallel 6 / 20 The maximum torque in an induction motor depends on all of the above rotor inductive reactance frequency square of supply voltage 7 / 20 DOL starting of induction motors is usually restricted to high speed motors variable speed motors high horsepower motors low horsepower motors 8 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type and both star connected only delta connected only none of the above 9 / 20 In medium sized induction motors the slip is generally around 0.14 0.0004 0.004 0.04 10 / 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 11 / 20 Stepless speed control of induction motor is possible by which of the following methods ? Changing the number of poles Cascade operation None of the above E.M.F. injection in rotor circuit 12 / 20 The injected e.m.f. in the rotor of induction motor must have the same phase as the rotor e.m.f. the same frequency as the slip frequency high value for the satisfactory speed control zero frequency 13 / 20 The shaft of an induction motor is made of flexible stiff hollow any of the above 14 / 20 The crawling in the induction motor is caused by harmonics developed in the motor improper design of the machine high loads low voltage supply 15 / 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 supply frequency changing number of poles 16 / 20 The frame of an induction motor is usually made of cast iron aluminium bronze silicon steel 17 / 20 A 3-phase induction motor stator delta connected is carrying full load and one of its fuses blows out. Then the motor will stop and carry heavy current causing permanent damage to its winding will continue running without any harm to the winding will continue running burning its one phase will continue running burning its two phases 18 / 20 In the circle diagram for induction motor the diameter of the circle represents line voltage running torque slip rotor current 19 / 20 Which of the following component is usually fabricated out of silicon steel ? None of the above Stator Core Bearings Shaft 20 / 20 A double squirrel-cage induction motor has two series windings in stator two parallel windings in stator two rotors moving in oppsite direction two parallel windings in rotor 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
