How do you test a diaphragm for leaks?
What will be an ideal response?
A diaphragm can be tested for leaks by first setting the regulator to 14 psig (95 kPag) for fuel gases or 45 psig (310 kPag) for oxygen and other gases. Once the pressure is set, place a finger over the vent hole and spray it with a leak-detecting solution. Slowly move the finger from the hole and watch for bubbles, which indicate a leak.
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Figure 21-5
At the right side of the schematic shown in the accompanying figure is the notation "LOCATED IN RELAY CABINET". What information is given by this notation?
What will be an ideal response?
What are four factors that a good propagation medium should have?
What will be an ideal response?
Why was agricultural Mesopotamia a world at war?
a. It was subject to frequent invasions from other powers such as Egypt. b. A stable balance of power among the Mesopotamian cities was impossible to preserve. c. Frequent famines led to large-scale peasant revolts. d. Climate change forced many Mesopotamians to migrate from north to south.
A vacuum pump with a capacity of 6 to 12 cfm should be adequate to evacuate systems with capacities up to
_____. A) 10 tons B) 30 tons C) 50 tons D) 100 tons