Deck 2: The DC Series Motor

Question 1

A shunt motor is typically used for railway installations, cranes, and other applications requiring high torque at low speed.

Answer 1

False

Question 2

Name two examples of applications that utilize DC series motors.

Answer 2

The DC series motor is often used for starter motors in automobiles and aircraft.
DC motors are used in forklifts and diesel electric locomotives.

Question 3

A series motor produces a greater torque than a shunt motor for the same increase in current.

Answer 3

True

Question 4

The direction of ____________________ may be reversed by changing the direction of the current either in the series field or the armature.

Question 5

Figure 02-2

What accounts for the flattened slope of the speed torque curve of the series motor in the accompanying figure?

Question 6

When a mechanical load is added to the series motor, the motor slows with a new, higher torque requirement.

Question 7

The series motor maintains a constant speed as mechanical load is added.

Question 8

The speed regulation of a line-connected series motor is inherently better than that of a shunt motor.

Question 9

Briefly describe the effects of a reduction of a load on the speed of a DC series motor.

Question 10

Name three of the four characteristics used in rating series DC motors.

Question 11

Draw the basic connection circuit of a series DC motor.

Question 12

The DC series motor has very high starting torque at very low _______________________.

Question 13

A series motor produces a greater ____________________ than a shunt motor for the same increase in current.

Question 14

In a series motor, any increase in load causes an increase of ____________________ in both the field and armature circuits.

Question 15

A(n) ____________________ motor is used as a traction motor because of its capability to produce a high torque with only a moderate increase in power at reduced speed.