____ alloys have excellent wetting, flow, and strength characteristics, but they are expensive.
A. Tin-antimony
B. Cadmium-silver
C. Cadmium-zinc
D. Copper-zinc
Answer: B
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Which of the following is an NEC Article 427 requirement for the installation of electrical heat-tracing cables on pipe and vessels in unclassified areas?
a. The external surfaces of any equipment that operates at temperatures above 100°F (38°C) must be physically guarded, isolated, or thermally protected. b. Branch circuits and overcurrent devices supplying the equipment must be sized at no less than 100 percent of the total heater load. c. The heating cable cannot be allowed to make direct contact with the pipe or vessel. d. The presence of electric heating equipment must be identified using permanent caution signs or markings at the specified intervals.
Why must the length and depth of a crack be determined in order to repair it??
What will be an ideal response?
Does any of the energy of the sun reach the earth by conduction or convection?
What will be an ideal response?
Technician A says if a car appears normal inside the passenger compartment and the exterior looks good, it is probably in good mechanical condition. Technician B says a car can appear fine but have hidden damage. Who is correct?
A. Technician A B. Technician B C. Both A and B D. Neither A nor B