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 DOL starting of induction motors is usually restricted to high horsepower motors high speed motors variable speed motors low horsepower motors 2 / 20 For which motor the speed can be controlled from rotor side ? None of the above Slip-ring induction motor Squirrel-cage induction motor Both and (2) 3 / 20 A double squirrel-cage induction motor has two parallel windings in rotor two series windings in stator two parallel windings in stator two rotors moving in oppsite direction 4 / 20 In medium sized induction motors the slip is generally around 0.04 0.0004 0.004 0.14 5 / 20 In case of the induction motors the torque is directly proportional to (slip)2 directly proportional to slip inversely proportional to (Vslip) inversely proportional to slip 6 / 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 7 / 20 In the circle diagram for induction motor the diameter of the circle represents line voltage running torque slip rotor current 8 / 20 The speed of a squirrel-cage induction motor can be controlled by all of the following except changing winding resistance changing supply frequency changing number of poles reducing supply voltage 9 / 20 The shaft of an induction motor is made of stainless steel cast iron high speed steel carbon steel 10 / 20 The injected e.m.f. in the rotor of induction motor must have the same phase as the rotor e.m.f. zero frequency high value for the satisfactory speed control the same frequency as the slip frequency 11 / 20 When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered in series in parallel with stator in parallel in series-parallel 12 / 20 The maximum torque in an induction motor depends on frequency all of the above rotor inductive reactance square of supply voltage 13 / 20 Size of a high speed motor as compared to low speed motor for the same H.P. will be bigger smaller same any of the above 14 / 20 The shaft of an induction motor is made of flexible hollow stiff any of the above 15 / 20 The frame of an induction motor is usually made of silicon steel cast iron aluminium bronze 16 / 20 Which of the following component is usually fabricated out of silicon steel ? Shaft Bearings None of the above Stator Core 17 / 20 The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type and both star connected only delta connected only none of the above 18 / 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 19 / 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 20 / 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 one phase will continue running without any harm to the winding will continue running burning its two phases will stop and carry heavy current causing permanent damage to its winding कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। NameEmailPhone NumberDistrictSchool/Coaching Name Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
