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