If someone is practicing three point contact they will be:
a. using a special type of fastener
b. in contact with a machine with two hands and one foot or two feet and one hand
c. be in contact with a machine with a hand, foot and a safety harness d. be in a machine's seat with a three point seat belt on
B
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In many manufacturing plants, individuals are often working around high-temperature surfaces. Exposed hot surfaces that can cause thermal burns on human skin are considered hazards in the workplace. Metallic surfaces above 70°C can instantly damage skin that touches them. Consider an AISI 1010 carbon steel strip (? = 7832 kg/m3) 2 mm thick and 3 cm wide that is conveyed into a chamber to be cooled at a constant speed of 1?m/s. The steel strip enters the cooling chamber at 597°C. Determine the rate at which heat needs to be removed so that the steel strip exits the chamber at 47°C. Discuss how the conveyance speed can affect the required rate of heat removal.
Determine the proper settings for proportional gain and reset time on a two-mode controller using the Ziegler-Nichols Continuous Cycling method, the process identification curve in Figure 12-4a, and Table 12-4b.
Figure 12-4a
Controller Mode
Proportional Gain Kc
Proportional Band PB
Reset Time Ti (Minutes per Repeat)
Reset Rate Tr (Repeats per Minute)
Derivative Time Td
P
0.5 Gu
2 PBu
N/A
N/A
N/A
PI
0.45 Gu
2.2 PBu
Pu/1.2
1.2/Pu
N/A
PID
0.6 Gu
1.7 PBu
0.5 Pu
2/Pu
Pu/8
Table 12-4b
What will be an ideal response?
What role does cost play in determining performance?
What will be an ideal response?
Which of the following is not a bacterial-related disease?
A. Brucellosis B. Cat scratch disease C. Plague D. Tularemia E. Feline panleukopenia