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