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 crawling in the induction motor is caused by low voltage supply harmonics developed in the motor improper design of the machine high loads 2 / 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 parallel with stator in series 3 / 20 The shaft of an induction motor is made of stiff flexible any of the above hollow 4 / 20 In the circle diagram for induction motor the diameter of the circle represents running torque slip line voltage rotor current 5 / 20 The injected e.m.f. in the rotor of induction motor must have the same frequency as the slip frequency high value for the satisfactory speed control the same phase as the rotor e.m.f. zero frequency 6 / 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 7 / 20 The maximum torque in an induction motor depends on all of the above frequency rotor inductive reactance square of supply voltage 8 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type delta connected only star connected only none of the above and both 9 / 20 The shaft of an induction motor is made of carbon steel cast iron high speed steel stainless steel 10 / 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 two phases will continue running burning its one phase will continue running without any harm to the winding will stop and carry heavy current causing permanent damage to its winding 11 / 20 For which motor the speed can be controlled from rotor side ? Slip-ring induction motor None of the above Squirrel-cage induction motor Both and (2) 12 / 20 Size of a high speed motor as compared to low speed motor for the same H.P. will be bigger any of the above smaller same 13 / 20 In medium sized induction motors the slip is generally around 0.04 0.14 0.0004 0.004 14 / 20 Stepless speed control of induction motor is possible by which of the following methods ? Cascade operation Changing the number of poles E.M.F. injection in rotor circuit None of the above 15 / 20 Which of the following component is usually fabricated out of silicon steel ? Stator Core Bearings None of the above Shaft 16 / 20 The frame of an induction motor is usually made of cast iron bronze aluminium silicon steel 17 / 20 Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ? By operating two motors in cascade By injecting e.m.f. in the rotor circuit Rotor rheostat control By changing the number of stator poles 18 / 20 In case of the induction motors the torque is inversely proportional to (Vslip) inversely proportional to slip directly proportional to (slip)2 directly proportional to slip 19 / 20 The speed of a squirrel-cage induction motor can be controlled by all of the following except changing winding resistance changing number of poles changing supply frequency reducing supply voltage 20 / 20 DOL starting of induction motors is usually restricted to high speed motors low horsepower motors variable speed motors high horsepower motors 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
