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