Fire Extinguishers Test (true or false) 53. Never play with the extinguishers so they will remain charged for
emergencies.
54. Before you use an extinguisher check what kind it is.
55. Class A - wood, paper, trash, etc...
56. Class B - flammable liquids such as paints and finishes.
57. Class C - electrical fires.
58. ABC extinguishers should be safe for all type fires.
59. Water on flammable liquids will spread the fire since it floats on the water.
60. Water on electrical is a shocking choice.
Portable Drill Test

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?