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