The volume of a rock is measured by placing the rock in a graduated cylinder partially filled with water and measuring the increase in volume. Eight independent measurements are made. The average of the measurements is 87.0 mL, and the standard deviation is 2.0 mL.
a. Estimate the volume of the rock, and find the uncertainty in the estimate.
b. Eight additional measurements are made, for a total of 16. What is the uncertainty, approximately, in the average of the 16 measurements?
c. Approximately how many measurements would be needed to reduce the uncertainty to 0.4 mL?
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The discharge air temperature is warm and the pressure gauges are as shown. What is the MOST LIKELY cause?
A) Low on refrigerant
B) Icing of the evaporator
C) Lack of airflow through the condenser
D) Defective compressor
How does a coil sensing tstat prevent frost on a medium temperature evaporator?
a. It has a narrow temperature swing to prevent frost buildup. b. It has a wide temperature swing to allow time to defrost. c. The tstat won’t start the compressor until the evaporator frost has melted. d. The tstat knows when to go into defrost.
Skin exposed to streams of liquid refrigerant can receive:
A) Cardiac arrhythmia. B) Convulsions and vomiting. C) A tingling effect. D) A burn from the subzero liquid.
The inside temperature of an oven is maintained at 450 ºF while the kitchen air temperature is 76 ºF. What is oven/kitchen air temperature difference in (a) degree Fahrenheit, (b) degree Rankine, (c) degree Celsius, and (d) Kelvin?
What will be an ideal response?