A scale is an instrument with a system of ordered marks at fixed intervals used as a reference standard in measurement.
Answer the following statement true (T) or false (F)
True
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Answer the following statement(s) true (T) or false (F)
1. Control magnetic relays are used to control small loads. 2. Most of the relays used in machine tool control have double-break contacts. 3. Relays are used more often to open and close control circuits than to operate power circuits. 4. The greatest advantage of relays with mechanical contacts is that they are resistant to shock and vibration. 5. Magnetic relays are affected by the electric noise and the voltage spikes induced in the system.
Heat pump control systems and air-conditioning control systems are similar in many ways.
Answer the following statement true (T) or false (F)
Technician A says that magnetism can cause electric current to flow in a conductor. Technician B says that magnetic lines of flux can never penetrate rubber insulation on a conductor. Who is right?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
When reading instructions or a series of steps, one should _____
a. read only the steps that he or she doesn't know b. perform the steps even if he or she doesn't understand them c. read the directions completely d. skim the directions quickly