Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Prepare for the Oilers/Plant Tenders Test with comprehensive flashcards and multiple choice questions. Each question includes hints and explanations. Enhance your readiness for the exam!

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A grade of 1 in 20 is approximately the same as a __________ rise in a __________ run.

12 inch; 7 yard
10 inch; 5 yard
15 inch; 10 yard
8 inch; 6 yard

The correct answer is: 12 inch; 7 yard

A grade of 1 in 20 indicates a slope where for every 20 units of horizontal distance, there is a rise of 1 unit. To put this into practical terms, the rise can be expressed in inches over a run expressed in yards. To analyze why the first option is accurate, we convert the horizontal distance (run) and the vertical distance (rise) to compatible units. A rise of 1 unit (1 inch) over a run of 20 units means that for a run of 7 yards (21 feet), the rise would indeed be approximately 12 inches. This conversion follows from understanding that 1 yard equals 3 feet, therefore, 7 yards is 21 feet. Using the 1 in 20 slope to find the rise for a 21-foot run (which is roughly the same as 20 feet for easier calculations, equating that 12 inches is a consistent representation over that distance). In summary, a 12-inch rise over a 7-yard run accurately reflects the 1 in 20 grade. The remaining choices either do not correspond appropriately to the measurement of the grade or provide figures that do not align with the consistent proportionality dictated by the grade of 1 in 20