Читать книгу Farm Machinery and Equipment - Harris Pearson Smith - Страница 34

1. Trace the development of power lifts.

2. Give the fundamental law of enclosed liquids.

3. A cylinder 10 inches in length and 10 inches in diameter is completely filled with oil. A pressure of 20 pounds is applied through an opening in the top. What is the total pounds pressure on the bottom?

4. Explain the action of a gear pump.

5. A gear pump is forcing oil into a cylinder 2 1/2 inches in diameter and 8 inches in length at a pressure of 750 pounds. What is the total pounds pressure against the cylinder piston?

6. Explain the difference in action of a single- and a double-action cylinder. Give an application of the use of each type.

7. Explain the functions of a master control unit and what is meant by selective controls.