The size of an excavator is usually expressed in terms of

Ward-Leonard controlled D.C. drives are generally used for _________ excavators.

________ need frequent starting and stopping of electric motors,

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

When the load is above _________ a synchronous motor is found to be more economical.

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

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

For which of the following applications D.C. motors are still preferred?

The starting torque of a D.C. motor is independent of which of the following?

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

Has relatively wider range of speed control.

For a motor-generator set which of the following motors will be preferred?

By the use of which of the following D.C. can be obtained from AC.?

In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible,

In ________ the speed can be varied by changing the position of brushes.

Is preferred for automatic drives.

________ has the least value of starting torque to full load torque ratio.

Rotor of a motor is usually supported on _________ bearings.

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

________ has least range of speed control.

For a D.C. shunt motor which of the following is incorrect?

Which of the following happens when star-delta starter is used?

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

Is preferred for synthetic fibre mills.

__________ motor is a constant speed motor.

For blowers which of the following motor is preferred?

Which of the following motors is preferred when quick speed reversal is the main consideration?

Which of the following motors is preferred for traction work?

For derris and winches which of the following drives can be used?

In squirrel cage induction motors which of the following methods of starting cannot be used?