Electrician 3 Phase Induction Quiz Set 1 in English Posted on June 11, 2020September 8, 2020 by Surendra 0% 0 Created by Surendra 3 Phase Induction Quiz in English Set 1 All Important Question Answers for Electrician Related Exams 1 / 20 In case of the induction motors the torque is inversely proportional to (Vslip) inversely proportional to slip directly proportional to slip directly proportional to (slip)2 2 / 20 In the circle diagram for induction motor the diameter of the circle represents rotor current running torque line voltage slip 3 / 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 4 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type delta connected only and both none of the above star connected only 5 / 20 In medium sized induction motors the slip is generally around 0.0004 0.004 0.04 0.14 6 / 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 stop and carry heavy current causing permanent damage to its winding will continue running without any harm to the winding 7 / 20 Size of a high speed motor as compared to low speed motor for the same H.P. will be same any of the above bigger smaller 8 / 20 Stepless speed control of induction motor is possible by which of the following methods ? None of the above Changing the number of poles E.M.F. injection in rotor circuit Cascade operation 9 / 20 The shaft of an induction motor is made of stainless steel high speed steel carbon steel cast iron 10 / 20 The injected e.m.f. in the rotor of induction motor must have the same phase as the rotor e.m.f. high value for the satisfactory speed control the same frequency as the slip frequency zero frequency 11 / 20 Which of the following component is usually fabricated out of silicon steel ? None of the above Shaft Stator Core Bearings 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 maximum torque in an induction motor depends on frequency square of supply voltage all of the above rotor inductive reactance 14 / 20 When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered in series in parallel in series-parallel in parallel with stator 15 / 20 The frame of an induction motor is usually made of aluminium silicon steel bronze cast iron 16 / 20 DOL starting of induction motors is usually restricted to variable speed motors low horsepower motors high horsepower motors high speed motors 17 / 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 18 / 20 The shaft of an induction motor is made of hollow any of the above flexible stiff 19 / 20 The crawling in the induction motor is caused by improper design of the machine harmonics developed in the motor low voltage supply high loads 20 / 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 कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। Your score is LinkedIn Facebook Twitter 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
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