The histogram below presents the compressive strengths of a sample of concrete blocks hardened for 28 days. One rectangle from the histogram is missing. What is its height?
The relative frequencies of the rectangles shown are 0.05, 0.1, 0.15, 0.25, 0.2, and 0.1. The sum of these relative frequencies is 0.85. Since the sum of all the relative frequencies must be 1, the missing rectangle has a height of 0.15.
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Which of the following describes continuity monitoring?
a. Uses a heat-tracing controller or current-monitoring relay to signal an alarm when the current in the heat tracing circuit is too low or too high b. Measures the temperature of the pipe with a digital controller connected to a resistance temperature detector temperature sensor attached to the pipe c. Monitors the current leakage from the system heating cable, power wiring, and components to ground using ground fault circuit breakers and/or current-sensing devices that measure current d. Verifies that voltage is present at the end termination of a heat tracing cable run
____ are held in position by the pitman arm, idler arm, and center link.
A. Pivot sockets B. Tie-rods C. Clock springs D. Spiral cables
Plants must reproduce to go on living
Indicate whether the statement is true or false
A(n) enhanced starter or advanced engagement starter may feature all of these components except:
A. start capacitor B. unique pinion spring C. tandem solenoid D. dual layer brushes