Which of the following statements about portable fire extinguishers is MOST accurate? 

Compression molding is slow but has better properties than injection molding for the same material

In injection molding, what is the most important parameter in controlling the anisotropy of the material? (Hint: Remember that injection molding is typically only used for thermoplastics)

Define “subtractive manufacturing”

Which of the following types of smoke detectors works on all types of fires and is best suited for living rooms and bedrooms?

According to NFPA 25: Standards for the Inspection, Testing, and Maintenance of Water-based Fire Protection Systems, fire hydrant inspections should be performed: 

When allowing hot work operations to proceed, at least one fire extinguisher with a minimum 2-A:20-B:C rating should be located within 30 ft. of where the hot work is being conducted.

What are the five necessary conditions for a dust explosion to occur?

The maximum travel distance to a Class A extinguisher is ___ feet (m). 

A facility uses acetone in large mixing tanks to achieve the correct viscosity required by a customer. The acetone arrives in 55 gallon drums and is pumped using a hand-crank pump into the mixer vessels. The vessel is open topped and vapor freely volatilizes into the room. What is the required exhaust ventilation (to the nearest cubic foot per minute) to ensure that an explosive vapor concentration will not be accumulated during tank filling (assume that we require a safety factor of 5)?