If an electrical load in a split-system air conditioner is not working, the technician must determine if the problem is:
A) Chronic or acute.
B) Repairable or not repairable.
C) In the load itself or in the switches that control the load.
D) In the line voltage or the low voltage.
C
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The heating capacity of a calorimeter is known to be 4 kJ/°C, with negligible uncertainty. The number of dietary calories (kilocalories) per gram of a substance is given by C=cH(?T)/m, where C is the number of dietary calories,H is the heating capacity of the calorimeter, ?T is the increase in temperature in °C caused by burning the substance in the calorimeter, m is the mass of the substance in grams, and c=0.2390 cal/kJ is the conversion factor from kilojoules to dietary calories. An amount of mayonnaise with mass 0.40 ± 0.01 g is burned in a calorimeter. The temperature increase is 2.75 ± 0.02°C.
a. Estimate the number of dietary calories per gram of mayonnaise, and find the uncertainty in the estimate. b. Find the relative uncertainty in the estimated number of dietary calories. c. Which would provide a greater reduction in the uncertainty in C: reducing the uncertainty in the mass to 0.005 g or reducing the uncertainty in ?T to 0.01°C?
Which type of bearing uses small thin rollers?
A) Roller B) Ball C) Needle D) All of these are correct.
The Class A type fire extinguisher is ________ and is used for paper or wood fires
A) red B) yellow C) green
What position are the split-system shutoff valves in when the unit ships?
A) backseat cracked B) backseated C) frontseated D) frontseat cracked