Electrical Drives and Controls — Winter 2018

Describe the classification of Electric Drives

Differentiate between AC and DC Drive.

Explain the basic elements of an electric drive system with figure and also mention the advantages of an Electric Drive.

Define DC Shunt and DC Series Motor with a neat sketch.

Afour pole, 3-phase, 50Hz, star connected induction motor has full load with slip of 4%, Calculate the speed of the motor on full load condition.

Explain Electric braking of DC shunt Motor

Derive the Torque equation of DC Motor and explain the characteristics of DC Series Motor.

Define the term Slip and Synchronous speed.

Differentiate between Squirrel cage and Slip ring induction Motors.

Classify the different types of Single Phase Induction Motor and explain any one of them with a neat sketch.

Explain the necessity of starters for D.C Motor.

Explain the effect of slip on Rotor frequency & Rotor induced EMF.

Explain Induction motor as a transformer.

Why DC series motor should not be started without loaded conditions?

Write a short note on Ward-Leonard method of speed control.

Explain the types of Choppers with neat sketch.

Explain any one of the speed control methodfor DC shunt Motor.

Write down the applications of DC Choppers.

Explain 3 point starter with a neat diagram.

Briefly explain the working of Star-Delta starter.

Explain Voltage/frequency control of AC Drives.

Explain Single phase Full Bridge Inverter with Inductive load

Write down the merits and demerits of AC Drives.

Differentiate between Voltage Source Inverter (VSI) and Current Source Inverter (CSI).

Explain Single phase Half wave controlled rectifier with Resistive load.