Determine the V/H ratio when frequency changes and the voltage is constant.

List the reasons for using AC drives to control the speed of AC motors.Explain the methods of controlling the speed of an AC motor and identify which one is most effective. Describe the purpose of the following sections of an AC drive:

Operator Control               Drive Controller                         AC Motor

Explain the differences among volts/Hz, AC closed-loop vector, and sensorless vector control methods. Describe the operation of the following major sections of the VAC drive:

Converter     Intermediate               Circuit Inverter

Determine the V/H ratio when frequency changes and the voltage is constant.Describe the operation of the flux vector drive.

 

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Determine the blank diameter and the other drawing variables for the dies of all draws.

8.6 In a particular piercing operation, 20 mm holes are to be punched in a brass sheet of 3 mm thick. The maximum shear strength of the sheet may be….

Where are the following used?

8.23 How does the grain direction in sheet metal affect the design of: (a) Bending dies (b) Blanking dies 8.24 Generally, the die opening is straight up to a certain….

Explain the process of air carbon arc cutting.

9.82 Explain the process of air carbon arc cutting. 9.83 Explain the resistance welding process giving the equipment, parameters controlled and the applications. 9.84 What are the parameters to be….