electrical drives and control

Which of the following type electric drive is used in cranes?

• Individual

• Multimotor

• Group

• None of the Above

Which of the following is the basic elements of a electric drive?

• Control system

• Electric motor

• Both

• None of the above

Which of the following drive is used for metal-cutting machines tools, rolling mills.

• Group Drive

• Individual drive

• Multimotor drive

• All of the above

The selection of an electric motor for any application depends on which of the following factors?

• Electrical Characteristics

• Mechanical Characteristic

• Size and rating of the motors

• All

The load cycle for a motor driving a power press will be

• Variable load.

• Continuous load

• Continuous but periodic.

• Intermittent and variable load.

To obtain heating and cooling curve of an electric motor, following assumptions are made

• Homogenous body

• Non-Homogenous body

• Heat dissipation is not constant

• None of above

Example for continuous duty ______

• Paper mill drive

• Conveyers

• Fan

• All

Example for short time duty_______

• Crane drive

• Pressing

• Cutting

• Drilling

Some drive may employ more than one of the modulator’s

• Converters

• Inverters

• AC voltage regulators

• All

A single motor which drives one or more line shafts supported on bearings is called ______

• Individual drive

• Group drive

• Multimotor drive

• None