What is the purpose of an ice thickness probe on a cubed-ice machine?
a. It initiates and terminates defrost.
b. It maintains proper ice cube temperature.
c. It controls the dimensions of the ice cube.
d. It prevents premature breaking of ice cube sheets.
d
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Which of the following may be used to detect unusual bearing noise during rundown when the motor is powered down?
a. Megger b. Infrared thermometer c. Vibration tester d. Stethoscope
How many wraps of duct tape must be made around a flexible duct when it is attached to a round collar?
a. 1 b. 2 c. 3 d. 4
A compound planetary gear set contains two complete planetary gear sets.
Answer the following statement true (T) or false (F)
A chemist made six independent measurements of the sublimation point of carbon dioxide (the temperature at which it changes to dry ice). She obtained a sample mean of 196.64 K with a standard deviation of 0.68 K.
a. Use the Student’s t distribution to find a 95% confidence interval for the sublimation point of carbon dioxide. b. Use the Student’s t distribution to find a 98% confidence interval for the sublimation point of carbon dioxide. c. If the six measurements had been 196.35, 196.32, 196.4 198.02, 196.36, 196.39, would the confidence intervals above be valid? Explain.