EE6351 Electrical Drives and control, Second year, Department of Mechanical Engineering, first and second Units Questions.

EE6351 Electrical Drives and control

Second year, Department of Mechanical Engineering

First and second Units Questions.

PART - A (5* 2 = 10Marks)

1. What is an individual drive? Give examples.
2. List out the factors considered for selection of drives.
3. List the types of single phase induction motor.
4. Write the emf equation of DC motor.
5. List out differences between DC shunt and series motor.
6. What is Thermal loading?
7. List out the various types of enclosures.
8. Compare AC and DC drives.
9. Draw speed vs. torque characteristics of Compound motor.
10. Draw the circuit diagram of separately excited DC motor.

PART-B

1. Define heating & cooling of motor. Derive heating & cooling curve of motor with necessary assumptions.                                                                                                               (13)
2. Discuss various types of electrical braking & braking characteristics of DC shunt and series motor.                                                                                                                          (13)
3. Derive torque equation of 3phase induction motor and obtain torque vs. speed characteristics.                                                                                                                                              (13)
4. A constant speed drive operating at a speed of 500 rpm has acyclic loading as given below i. 200Nm for 10 minutes            ii.300Nm for 20           minutes. iii. 150Nm for 20 minutes. iv.          No load for 20 minutes            . Estimate Power rating of the motor.                                                               (13)
5. Explain various classes of duty of motor drives.                                                                     (13)

PART-C

1.      Explain electrical drive system. How is it classified .List its advantages and disadvantages?                                                                                                                           (15)