Potentially gassy operations exist when what conditions are present?
What will be an ideal response?
• When air monitoring for a 24-hour period shows the presence of methane or any other flammable gas in concentrations of 10% or more of the lower explosive limit measured at 12 inches from the floor, ceiling, or walls of the underground work area.
• When the geological formation or history of the work area makes it likely that the conditions just explained will exist.
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What type of auxiliary device promotes separation of heavy and light liquids by centripetal force?
A. Demister B. Jet pump eductor C. Centrifuge D. Hydrocyclones
When rebuilding a diesel engine water pump, which of the following components has to be handled with a great amount of care?
A. steel impellers B. plastic impellers C. drive pulley D. ceramic seal
The specific gravity of diesel fuel is measured in what units?
A) Hydrometer units B) Cetane number C) Grade number D) API gravity
With the balloon framing method, the studs run from the top of the foundation to the top of the highest level, and the wall members are continuous from the foundation to the roof, fewer horizontal members are used.
Answer the following statement true (T) or false (F)