Which refrigerant/s have an ODP of zero?
A. CFC
B. HCFC
C. HFC
D. HC
E. both c and d
Answer: E
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A contractor is likely to select and use a specific form system whenever possible because _____.
a. crews are trained in its use b. it is the most expensive c. it is readily available d. contracts require use of that system
(a) A beam that is part of a rigid frame has end moments and mid-span moments for dead, live, and earthquake loads shown below. Determine the governing load combination for both negative and positive moments at the ends and mid-span of the beam. Earthquake load can act in either direction, generating both negative and positive moments in the beam.
An electric current of 1 A passing through a cable has a measured voltage of 30 V across the cable. The cable is covered with polyethylene insulation, and convection occurs at the outer surface of the insulation. The ambient temperature is 20°C with a convection heat transfer coefficient of 5 W/m2•K, and the surface area subjected to the convection is 0.1 m2. The ASTM D1351 standard specifies that thermoplastic polyethylene insulation is suitable for use on electrical cable with operation at temperatures up to 75°C. Under these conditions, will the polyethylene insulation for the cable meet the ASTM D1351 standard? If the polyethylene insulation does not meet the ASTM D1351 standard, then discuss possible solutions to meet the standard.
What will be an ideal response?
The first consortium to deploy satellite telephony, whose intent is to provide dial tone anywhere in the world without the need for wires, cellular towers, or other land-oriented connections is:
A) Teledesic B) Globalstar C) Iridium D) all of the above share the same objective and were deployed at the same time