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 component is usually fabricated out of silicon steel ? None of the above Stator Core Shaft Bearings 2 / 20 A double squirrel-cage induction motor has two parallel windings in stator two series windings in stator two parallel windings in rotor two rotors moving in oppsite direction 3 / 20 For which motor the speed can be controlled from rotor side ? Slip-ring induction motor None of the above Both and (2) Squirrel-cage induction motor 4 / 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 bigger smaller 5 / 20 The injected e.m.f. in the rotor of induction motor must have high value for the satisfactory speed control zero frequency the same frequency as the slip frequency the same phase as the rotor e.m.f. 6 / 20 In medium sized induction motors the slip is generally around 0.0004 0.04 0.004 0.14 7 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type delta connected only none of the above star connected only and both 8 / 20 The speed of a squirrel-cage induction motor can be controlled by all of the following except changing supply frequency changing number of poles reducing supply voltage changing winding resistance 9 / 20 Stepless speed control of induction motor is possible by which of the following methods ? Cascade operation None of the above Changing the number of poles E.M.F. injection in rotor circuit 10 / 20 In the circle diagram for induction motor the diameter of the circle represents running torque line voltage rotor current slip 11 / 20 The crawling in the induction motor is caused by harmonics developed in the motor low voltage supply improper design of the machine high loads 12 / 20 The frame of an induction motor is usually made of bronze aluminium silicon steel cast iron 13 / 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 14 / 20 In case of the induction motors the torque is directly proportional to (slip)2 inversely proportional to (Vslip) inversely proportional to slip directly proportional to slip 15 / 20 The shaft of an induction motor is made of high speed steel carbon steel stainless steel cast iron 16 / 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 By injecting e.m.f. in the rotor circuit By operating two motors in cascade Rotor rheostat control 17 / 20 DOL starting of induction motors is usually restricted to low horsepower motors high speed motors high horsepower motors variable speed motors 18 / 20 The maximum torque in an induction motor depends on square of supply voltage all of the above frequency rotor inductive reactance 19 / 20 The shaft of an induction motor is made of any of the above hollow stiff flexible 20 / 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 with stator in parallel 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
