Exam (elaborations)
OSHE 381 - Final Questions & Detailed Answers
- Course
- OSHE 381
- Institution
- University Of California - Berkeley
OSHE 381 - Final Questions & Detailed Answers
[Show more]
Content preview
OSHE 381 - Final Questions & Detailed AnswersCapacitance - ANS The storage of electrical potential
-caused by separating 2 conductors
Streaming Current - ANS Flow of electrons produced by transferring electrons from
one surface to another
Relaxation - ANS Pumping fluids into a tank through a pipe on top of the vessel
-Using a larger pipe just before the fluid enters the tank, the fluid flows slower and
less electrostatic charge builds up
Bonding and Grounding - ANS Voltage difference btw. 2 conductive materials is
reduced to zero by bonding the 2 materials
-Bonding by connecting one end of the conducting wire to one of the materials
and the other end of the second material
Dip Pipes - ANS Free falling liquids accumulate electrostatic charge
-dip pipes are extended legs that are used to eliminate some of the distance the
liquid must fall when filling the tank
-care must be taken to prevent siphoning back when the inlet flow is stopped- a
hole at the top will stop this
, Increasing conductivity with additives - ANS Accomplished by the addition of an
additive which will allow electrostatic charge to drain off
-also called antistatic additives
National Electrical Code (NEC) - ANS Divides hazardous locations into 3 classes and
divides each class into 2 divisions
Class I, Divison I - ANS -hazardous concentrations of flammable gases or vapours
exist continuously
-hazardous concentrations of such gases and vapours may exist frequently b/c of
repair or maintenance or b/c of leakage
-breakdown or faulty operation of equipment or processes which might release
hazardous concentrations of gases and vapours and might also cause failure to
electrical equipment
Class I, Divison II - ANS -volatile flammable liquids or gases are handled or used but
are normally confined in containers from which they can escape from accident
-hazardous concentrations of gases and vapors are normally prevented by positive
mechanical ventilation
-are adjacent to but not cut off from Class I, Divison I locations
Class II, Division I - ANS -combustible dust may be suspended in air
-mechanical failure or abnormal operation might cause such mixtures to be
produced and might also provide a source of ignition
-in which dusts of an electrically conductive nature may be present
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Schoolflix. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82215 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now