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 In the circle diagram for induction motor the diameter of the circle represents line voltage running torque rotor current slip 2 / 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 3 / 20 The shaft of an induction motor is made of stiff any of the above flexible hollow 4 / 20 The frame of an induction motor is usually made of silicon steel bronze cast iron aluminium 5 / 20 In medium sized induction motors the slip is generally around 0.14 0.04 0.004 0.0004 6 / 20 DOL starting of induction motors is usually restricted to high horsepower motors high speed motors low horsepower motors variable speed motors 7 / 20 Size of a high speed motor as compared to low speed motor for the same H.P. will be any of the above same smaller bigger 8 / 20 The shaft of an induction motor is made of carbon steel high speed steel stainless steel cast iron 9 / 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 10 / 20 The maximum torque in an induction motor depends on all of the above frequency square of supply voltage rotor inductive reactance 11 / 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 12 / 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 burning its one phase will continue running burning its two phases will stop and carry heavy current causing permanent damage to its winding will continue running without any harm to the winding 13 / 20 The injected e.m.f. in the rotor of induction motor must have high value for the satisfactory speed control the same frequency as the slip frequency zero frequency the same phase as the rotor e.m.f. 14 / 20 A double squirrel-cage induction motor has two series windings in stator two parallel windings in rotor two rotors moving in oppsite direction two parallel windings in stator 15 / 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 16 / 20 Which of the following component is usually fabricated out of silicon steel ? Shaft Stator Core Bearings None of the above 17 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type star connected only none of the above and both delta connected only 18 / 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-parallel in series 19 / 20 The crawling in the induction motor is caused by low voltage supply improper design of the machine high loads harmonics developed in the motor 20 / 20 Stepless speed control of induction motor is possible by which of the following methods ? Cascade operation Changing the number of poles None of the above E.M.F. injection in rotor circuit कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। NameEmailPhone NumberDistrictSchool/Coaching Name Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
