EE8353 Important Questions ELECTRICAL DRIVES AND CONTROLS

EE8353 Important Questions ELECTRICAL DRIVES AND CONTROLS Regulation 2017 Anna University free download. ELECTRICAL DRIVES AND CONTROLS Important Questions EE8353 pdf free download.

Sample EE8353 Important Questions ELECTRICAL DRIVES AND CONTROLS:

1. Why a single phase induction motor does not self start?
When a single phase supply is fed to the single phase induction motor. Its stator
winding produces a flux which only alternates along one space axis. It is not a
synchronously revolving field, as in the case of a 2 or 3phase stator winding, fed from 2 or 3 phase supply.

2. Define Drive and Electric Drive.
Drive: A combination of prime mover, transmission equipment and mechanical working load is called a drive
Electric drive: An Electric Drive can be defined as an electromechanical device for converting electrical energy to mechanical energy to impart motion to different machines and mechanisms for various kinds of process control.

3. How heating occurs in motor drives?
The heating of motor due to losses occurring inside the motor while
converting the electrical power into mechanical power and these losses
occur in steel core, motor winding & bearing friction. EE8353 Important Questions Electrical Drives and Controls

4. Give some examples of Electric Drives.
Driving fans, ventilators, compressors and pumps.
Lifting goods by hoists and cranes.
Imparting motion to conveyors in factories, mines and
warehouses Running excavators & escalators, electric locomotives trains,
cars trolley buses, lifts & drum winders etc.

5. What is an individual electric drive? Give some examples.
In this drive, each individual machine is driven by a separate
motor. This motor also imparts motion to various other parts of the
machine. Single spindle drilling machine, Lathe machines etc. EE8353 Important Questions Electrical Drives and Controls

6. What is a multi motor electric drive? Give some examples.
In this drive, there are several drives, each of which serves to
activate on of the working parts of the driven mechanisms.

7. What are the classes of duties?
1. Continuous duty
2. Short time duty operation of motor Main classes of duties
3. Intermittent periodic duty
4. Intermittent periodic duty with starting
5. Intermittent periodic duty with starting & braking
6. Continuous duty with intermittent periodic loading
7. Continuous duty with starting & braking
8. Continuous duty with periodic load changes EE8353 Important Questions Electrical Drives and Controls