Which organization grades engine oils by viscosity?
A. SAE
B. API
C. TMC
D. ATA
Answer: A
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Technician A says that all O- rings are OK to use with R 134a systems. Technician B says that the color of the O-ring indicates the material it is made from. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
The General Social Survey asked a sample of adults how many siblings (brothers and sisters) they had (X) and also how many children they had (Y). We show results for those who had no more than 4 children and no more than 4 siblings. Assume that the joint probability mass function is given in the following contingency table.
a. Find the marginal probability mass function of X.
b. Find the marginal probability mass function of Y.
c. Are X and Y independent? Explain.
d. Find 
and 
.
e. Find
and 
.
f. Find Cov(X, Y).
g. Find 
.
In reference to an electronic timer, identify the type of timer that cycles its output contact open and closed for preset intervals until the control signal is removed from the input.
What will be an ideal response?
Number the sequence of events to start the oil burner
A. Primary control starts burner motor and ignition transformer B. oil ignites C. Thermostat calls for heat D. cad cell sees flames E. primary control shuts off burner motor F. primary control keeps burner motor on G. thermostat is satisfied H. primary control deenergizes ignition transformer What will be an ideal response?