What danger is there to using a circuit breaker that is too large for a circuit?
A) The breaker may be too difficult to turn on.
B) The wire can overheat.
C) The voltage supplied to the unit may be too high.
D) As long as the breaker is at least the minimum required size, it will be safe.
B
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What GDI operating mode is used to burn sulfur from the NOx catalyst?
A) Stratified heating mode B) Stratified mode C) Homogeneous stratified mode D) None of these
Which of the following statements is correct regarding the ozone depletion potential (ODP) of refrigerants?
A. CFC and HFC refrigerants have the same ODP B. HCFC refrigerants have higher ODPs than CFC refrigerants C. CFC refrigerants have higher ODPs than HFC refrigerants D. CFC refrigerants have an ODP of zero
Determine the proper proportional band, reset rate, and derivative time on a three-mode controller using the Ziegler-Nichols continuous cycling method, the process identification waveform in Figure 12-1a, and the Table 12-1b.
Figure 12-1a
Controller ModeProportional 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 12-1b
What will be an ideal response?