### Industrial Drives and Applications Important Questions

Posted by Rex on June 14, 2021, 9:56 a.m. Diploma

- With a neat block diagram, state the essential parts of an electric drive system. Explain them briefly.
- What are the advantages of an electric drive system?
- With the help of the quadrantal diagram, explain the four-quadrant operation of a motor, drive a hoist load.
- Derive an expression for the equivalent load torque and equivalent moment of inertia for loads with translational and rotational motion.
- Explain the methods to measure the moment of inertia.
- Explain the different classifications of load torque and also define active load torque and passive load torque for example.
- Derive an expression to calculate the time and energy loss in transient operations.
- Explain the steady-state stability and derive the condition for steady-state stability.
- Derive an expression for moment of inertia of flywheel used in load equalization.
- With neat diagram explains various components of load torque.
- What are the factors responsible for the selection of motors?
- With usual notation, derive the expression for a temperature rise of a machine. Sketch the temperature riseversus the time curve.
- Determine the expression of over-loading facto ‘K’ while selecting the motor rating, for a short time duty class.
- Determine the expression of over-loading factor ‘K’ while selecting the motor rating, for intermittent period duty class.
- Explain the classification of duty for motors with load diagrams. With a neat graph explain briefly and give examples in each case.
- Develop an expression to determine the power rating of an electric motor using the method of equivalent current for variable load conditions.
- Determine the expression for a maximum number of switching frequency of a drive system.
- With a neat circuit and graph, explain the regenerative, dynamic, and plugging type of braking system for separately excited DC shunt motor.
- Discuss the various methods of speed control of DC motor.20. Explain the operation of a single-phase half-controlled rectifier control of separately excited DC motor.
- Explain the operation of a single-phase fully controlled rectifier control of separately excited DC motor.
- Explain with diagram three phase fully-controlled rectifier control of d.c. separately excited motor.
- With neat circuit diagrams explain the multi quadrant operations of DC separately excited motor.
- With neat circuits and waveforms for continuous conduction, explain the working of DC series motor fed from single phase half controlled rectifier.
- Explain the operation of a chopper control of separately excited DC motor and DC series motor.
- Explain the chopper control of separately excited DC motor for regenerative braking and dynamic braking.
- Explain the operation of variable frequency control from voltage sources
- Explain the operation of VSI fed induction motor drives.
- Explain any three methods of braking of an induction motor.
- Explain the static scherbius drive system.
- Explain clearly the driving motors used in the cement industry for different operations.
- With a neat sketch, explain the paper mill drive system.