Exam 4: Motor and Drive System

........ has relatively wider range of speed control

Heat control switches are used in

In series motor which of the following methods can be used for changing the flux per pole?

In jaw crushers a motor has to often start against....... load

Besides a constant speed a synchronous rotor possesses which of the following advantages ?

Belt conveyors offer ..........starting torque

Which of the following alternatives will be cheaper ?

While selecting an electric motor for a floor Mill, which electrical characteristics will be of least significance ?

Which feature while selecting a motor for centrifugal pump will be of least significance?

In........ method of starting three phase induction motors the starting voltage is not reduced

Rotor of the motor is usually supported on........... bearings

........is not a part of ball bearing

.............method of starting a three phase induction motor needs six terminals

Which of the following types of motor and enclosure is safest

While selecting a motor for air-conditioner the feature of utmost importance is

An elevator Drive is required to operate in

A pony motor is used for the starting which of the following motors ?

Which off the following motors is used for elevators?

For which off the following applications DC motors are still preferred?

........has least range of speed control