Allen built a levee averaging 2 feet high, 4.8 feet wide, and 3,820 feet long. He used an earth scraper with a capacity of 9 yards to help build the levee. To get the dirt, he lowered the field 4 inches. How many yards of dirt were moved to build the levee? (Note: Do not forget that the field was lowered.)
What will be an ideal response?
1,132 yd
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The contactor sequence for the circuit shown in Figure 2 is such that during the transition from reduced-voltage operation to full-voltage operation, the energized contactors are 2S and _____.
a. 1S
b. TR
c. T1
d. R
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.
Convert 2 3/16 to a decimal.
What will be an ideal response?
What protection mechanism employed by the 802.11g MAC layer transmits a frame with a destination MAC address of the same station that is transmitting the frame?
A. guard interval B. CTS-to-Self C. HCF D. PSMP