Lock out/ tagout

Lock out tag is a safety procedure that ensures that dangerous machines are properly shut off and not started up again prior to the completion of maintenance and/or servicing work. It is important in ensuring the safety of employees during inspection, maintenance and service of equipment by controlling all energy flow to and from equipment.

The types of energy sources that are of concern are: electrical, pneumatic, hydrolic pump, hydraulic line, water, gas, chemical, coolant or steam.

Here are some examples of lock outs, and tags used in this safety process.

Here is a set of instructions for the process:
Lock Out/Tag out Instructions

Ideal Gas Law Constants

For reference, here are the Ideal Gas Law Constants:

Ideal Gas Law Constants

Ideal Gas Law Constants

The Ideal Gas Law is: PV = nRT
Where P is the pressure, V is the volume, n is the number of moles and T is the Temperature. R is the ideal gas constant listed above. Remember that this equation of state is to be used sparingly, and always list that you assumed ideal gas behavior.

Putnam Test (2003)

2003 putnam exam

Solutions to the 2003 putnam exam

Putnam Test (2002)

2002 Putnam Exam

Solutions to the 2002 exam

Putnam Test(2001)

2001 putnam test

Solutions for 2001 Putnam Test

Putnam Test(2000)

2000 Putnam Test

2000 putnam test solutions

Putnam Test (1999)

1999 Putnam Test

Putnam Test Solutions 1999