What is Automatic Packing?
What will be an ideal response?
This type of molded packing is called Automatic because internal air or fluid pressure forces the lips of this type of packing to seal against some hard surface, usually a cylinder.
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The schematic (ladder) diagram shows the sequence of operation for a system
Indicate whether the statement is true or false
Which of the following is NOT a characteristic of satisfactory engine oil?
A) Provide dry friction between moving parts B) Resist foaming C) Pours at low temperatures D) Proper viscosity
Which of the following is NOT a "cultured" milk product?
A. Sour cream B. Buttermilk C. Yogurt D. Half-n-Half
Answer the following statement(s) true (T) or false (F)
1. By controlling the ohms supplied to the motor windings, a wide range of motor speeds can be obtained. 2. The essential features and parts of DC motors and generators are the same. 3. The direction of armature rotation of a DC motor depends on the direction of the current in the field and armature circuits. 4. Normal or base speed for a DC motor is obtained by connecting full voltage to both the armature and shunt field. 5. Three factors limit the current taken by the armature from a DC source.