Answer the following statement(s) true (T) or false (F)
1. There is a possibility of injury to an operator when the power suddenly resumes after a voltage failure.
2. It is desirable to provide some means of automatically restarting motors after voltage failures.
3. Three-wire control is impractical for preventing motor restart because momentary line voltage fluctuations occur in
many localities.
4. Restarting motors manually can cause damage to material in process or production.
5. To have the motor restart automatically, the operator will press the start button.
1. TRUE
2. FALSE
3. TRUE
4. TRUE
5. FALSE
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Ball bearings have more friction than roller bearings but can operate at higher speeds.
Answer the following statement true (T) or false (F)
Which of the following air brake system components functions as a lever?
A. The brake chamber B. The rotor C. The caliper D. The slack adjuster
When the teeth of one gear contact the roots of its mating gear, this is known as:
A. climbing B. zero lash C. bottoming D. clashing
Smart instruments are initially characterized _____
A) at the factory B) during commissioning C) during installation D) in the field