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 double squirrel-cage induction motor has two rotors moving in oppsite direction two parallel windings in rotor two series windings in stator two parallel windings in stator 2 / 20 The injected e.m.f. in the rotor of induction motor must have the same phase as the rotor e.m.f. zero frequency the same frequency as the slip frequency high value for the satisfactory speed control 3 / 20 The frame of an induction motor is usually made of cast iron bronze aluminium silicon steel 4 / 20 For which motor the speed can be controlled from rotor side ? Slip-ring induction motor Squirrel-cage induction motor None of the above Both and (2) 5 / 20 In case of the induction motors the torque is directly proportional to slip inversely proportional to slip inversely proportional to (Vslip) directly proportional to (slip)2 6 / 20 The maximum torque in an induction motor depends on frequency rotor inductive reactance square of supply voltage all of the above 7 / 20 Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ? Rotor rheostat control By changing the number of stator poles By injecting e.m.f. in the rotor circuit By operating two motors in cascade 8 / 20 The speed of a squirrel-cage induction motor can be controlled by all of the following except reducing supply voltage changing number of poles changing supply frequency changing winding resistance 9 / 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 two phases will continue running burning its one phase 10 / 20 The crawling in the induction motor is caused by high loads low voltage supply harmonics developed in the motor improper design of the machine 11 / 20 When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered in series-parallel in series in parallel in parallel with stator 12 / 20 Stepless speed control of induction motor is possible by which of the following methods ? E.M.F. injection in rotor circuit None of the above Cascade operation Changing the number of poles 13 / 20 DOL starting of induction motors is usually restricted to variable speed motors high speed motors high horsepower motors low horsepower motors 14 / 20 Which of the following component is usually fabricated out of silicon steel ? Shaft None of the above Bearings Stator Core 15 / 20 The shaft of an induction motor is made of flexible hollow stiff any of the above 16 / 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 17 / 20 Size of a high speed motor as compared to low speed motor for the same H.P. will be same any of the above bigger smaller 18 / 20 In medium sized induction motors the slip is generally around 0.14 0.04 0.0004 0.004 19 / 20 The shaft of an induction motor is made of stainless steel high speed steel cast iron carbon 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। Your score is LinkedIn Facebook Twitter 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
