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