11. A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor A. Will continue running burning its one phase B. Will continue running burning its two phase C. Will stop and carry heavy current causing permanent damage to its winding D. Will continue running without any harm to the winding Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
12. Star-delta starting of motors is not possible in case of A. Single phase motors B. Variable speed motors C. Low horse power motors D. High speed motors Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
13. In an induction motor the relationship between stator slots and rotor slots is that A. Stator slots are equal to rotor slots B. Stator slots are exact multiple of rotor slots C. Stator slots are not exact multiple of rotor slots D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
14. A 3-phase slip ring motor has A. Double cage rotor B. Wound rotor C. Short-circuited rotor D. Any of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
15. Low voltage at motor terminals is due to A. Inadequate motor wiring B. Poorly regulated power supply C. Any one of the above D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
16. A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6-poles. The slip of the machine will be A. 0.01 B. 0.02 C. 0.03 D. 0.04 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
17. It is advisable to avoid line starting of induction motor and use starter because A. It will run in reverse direction B. It will pick up very high speed and may go out of step C. Motor takes five to seven times its full load current D. Starting torque is very high Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
18. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor? A. By changing the number of stator poles B. Rotor rheostat control C. By operating two motors in cascade D. By injecting e.m.f. in the rotor circuit Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
19. In three-phase squirrel-cage induction motors A. Rotor conductor ends are short-circuited through slip rings B. Rotor conductors are short-circuited through end rings C. Rotor conductors are kept open D. Rotor conductors are connected to insulation Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
20. In an induction motor if air-gap is increased A. The power factor will be low B. Windage losses will be more C. Bearing friction will reduce D. Copper loss will reduce in an induction motor Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
