DC Motors

By changing the position of its brushes, the speed of this motor can be varied. Which one?

Which of the following motors are best suited for the rolling mills?

Which part of a motor needs maximum attention for maintenance?

Which of the following bearings should be oiled regularly?

Which one is another name for a magnetic starter?

During regenerative braking of electric motors, which of the following statements is true?

Which of the following motors is not a self-starting motor?

Which type of bearings is used to support the rotor of a motor?

For crane travel, which of the following motors are normally used?

Which one is considered the simplest form of a motor controller?

Which of the following machines has heavy fluctuation of load?

Which of the following motors is preferred for the boom hoist of a traveling crane?

Which of the following motors has series characteristics?

While plugging a dc motor, which connections are reversed?

Which motor is a constant speed motor?

While selecting an electric motor for a flour mill, which of the following electrical characteristics will be least significant?

Heavy duty steel works cranes which have wide load variations uses which of the following motors?

Which type of enclosure will be most suitable for motors employed in atmospheres containing inflammable gases and vapors?