How does a fire extinguisher work, and how should it be used?
What will be an ideal response?
A fire extinguisher works by breaking the fire triangle of heat, fuel, and oxygen. Most extinguishers both cool the fire and remove the oxygen. They use a variety of materials to extinguish the fire. The majority of fire extinguishers found in welding shops use foam, carbon dioxide, a pump tank, or dry chemicals. When using a foam extinguisher, do not spray the stream directly into the burning liquid. Allow the foam to fall lightly on the base of the fire. When using a carbon dioxide extinguisher, direct the discharge as close to the fire as possible, first at the edge of the flames and gradually to the center. When using a dry chemical extinguisher, direct the extinguisher at the base of the flames. In the case of type A fires, follow up by directing the dry chemicals at the remaining material still burning. The extinguisher must be directed at the base of the fire where the fuel is located.
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If the G-code is G20 G90 F6 G01 Z1.00:
A. The spindle will move at a rate of 6 inches per minute to a point where z = 1.00 in. B. The spindle will move at a rate of 6 inches per minute for a distance of 1.00 in. C. The spindle will move at a rate of 6 millimeters per minute to a point where z = 1.00 mm D. The spindle will move at a rate of 6 millimeters per minute for a distance of 1.00 mm
Answer the following statement(s) true (T) or false (F)
1. In a three-wire control circuit, when the supply voltage returns after a failure, the circuit is re-energized. 2. Pilot lights are tested frequently to ensure operation. 3. Sirens, horns, and loud buzzers may be used in production systems to call attention to malfunctions. 4. It is sometimes desirable to operate push buttons or other control devices at some voltage higher than the motor voltage. 5. When configuring separate control wiring, the maintenance technician must ensure that the proper connections are made.
The nutrient element magnesium is often supplied by which type of application?
A) injection of a gas into the soil B) broadcast of a chloride salt C) broadcast of the nearly pure element as a solid D) incorporation of powdered limestone rock E) application of a chelate to the soil
Technician A says that full hybrid electric vehicles need to be plugged into a standard AC electrical outlet to charge. Technician B says that the high voltage battery in an HEV uses a generator driven by the internal combustion engine for recharging. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician