Why should a carbon monoxide detector be used in any room where gas-fired space heaters are being used?
A) Because CO is an integral component of natural gas, a CO detector will alarm if there are any small gas leaks in the gas line.
B) High levels of CO can cause nuisance trips of the space heater's oxygen depletion sensor.
C) The efficiency of gas-fired space heaters drops when the CO level in the room exceeds 500 ppm.
D) Gas-fired space heaters can produce carbon monoxide if the space they are operating in does not have adequate combustion air.
D
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Manuel needed a barn to house his tobacco. He built a barn 52 feet long with three 16-foot sections. The two side sections are four tier poles high, and the middle section is five tier poles high. He did not need tier poles on the outside because the frame of the barn serves as a tier pole. The tier poles are placed on a 48-inch center. He used 16-foot-long 3X6s for tier poles that sell for $1.68 per board foot.
a. How many tier poles were needed? b. How many board feet are in one tier pole? c. What was the cost of the tier poles?
Which of the following is an example of a cool-season grass?
A. bahiagrass B. ryegrass C. orchard grass D. bermuda grass
Electronic control circuits can protect a system from a "low voltage" condition better than electromechanical controls.
Answer the following statement true (T) or false (F)
A sample of 25 resistors, each labeled 100 ?, had an average resistance of 101.4 ? with a standard deviation of 2.3 ?. Assume the resistances are normally distributed.
a. Find a 95% prediction interval for the resistance of a single resistor. b. Find a tolerance interval for the resistance that includes 90% of the resistors with 95% confidence.