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