1. Which is of the following data is required to draw the circle diagram for an induction motor? A. Block rotor test only B. No load test only C. Block rotor test and no-load test D. Block rotor test, no-load test and stator resistance test 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
2. Slip rings are usually made of A. Copper B. Carbon C. Phosphor bronze D. Aluminium 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
3. The starting torque of a three phase induction motor can be increased by A. Increasing slip B. Increasing current C. Both (A) and (B) 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
4. Rotor rheostat control method of speed control is used for A. Squirrel-cage induction motors only B. Slip ring induction motors only C. Both (A) and (B) D. None 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
5. The stating torque of the slip ring induction motor can be increased by adding A. External inductance to the rotor B. External resistance to the rotor C. External capacitance to the rotor D. Both resistance and inductance to rotor 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
6. A double squirrel-cage induction motor has A. Two rotors moving in opposite direction B. Two parallel windings in stator C. Two parallel windings in rotor D. Two series windings in stator 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
7. The term 'cogging' is associated with A. Three-phase transformers B. Compound generators C. D.C. series motors D. Induction motors 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
8. In medium sized induction motors, the slip is generally around A. 0.04 % B. 0.4 % C. 4 % D. 14 % 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
9. Blocked rotor test on induction motors is used to find out A. Leakage reactance B. Power factor on short circuit C. Short-circuit current under rated voltage D. All of the above 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
10. A 3-phase induction motor stator delta connected, is carrying full 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 phases 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 A No explanation is given for this question Let's Discuss on Board