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Vocabulary.

across the line - шунтуватися, під повним напругою

a field rheostat - реостат збудження

the magnitude of the current - магнітна сила струму

shunt-field coil - котушка паралельного збудження

series-field winding - послідовна обмотка збудження

differentially compound motor - двигун з різницевим компаундированием

cumulatively compound motor - двигун із зустрічним компаундированием

As long as - поки

Why can a motor be used as a generator and vice versa?

When will the conductor tend to move?

What are the three factors that the force exerted on the conductor depend on?

What does the length of the conductor determine?

Explain the formula which states the force on a conductor?

What is the main idea of ??a shunt motor.

What is the main idea of ??a compound motor?

What is the main idea of ??a series motor?

6. Check your comprehension of the text by answering the following multi-choice questions:

1. Which of the following is true?

a. a generator can be used as a motor

b. a motor can be used as a generator

c. both

2. The force exerted on the conductor is dependent upon:

a. existence of a magnetic field

b. conductor location in the magnetic field

c. flow of current in the conductor

d. all the three

3. If the magnitude of the flux density is small, the force on the conductor is:

a. small

b. great

c. does not depend on the flux density

4. Which of the following is true:

a. the smaller the conductor the bigger the magnetic force on it

b. the smaller the conductor the smaller the magnetic force on it

c. the longer the conductor, the greater the force exerted on it

d. the longer the conductor the smaller the force exerted on it

5. What does the force exerted on a conductor depend upon?

a. the flux density of the magnetic field

b. the length of the conductor in the magnetic field

c. the magnitude of the current in the conductor

d. all the three

6. The shunt motor is physically the same as:

a. a series motor

b. a shunt generator

c. a compound motor

d. no similarity with any other machine

7. The construction of the compound motor is identical with:

a. the compound generator

b. shunt motor

c. the series motor

d. no similarity with any other machine

8. In series motors at light loads;

a. the armature current is great

b. the flux is great

c. the armature current is small

d. the flux and torque are small

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