The subsequent problems deal with the circuit below where all voltage sources are dc and the circuit is assumed to be in steady state. Also, R1 = R2 = R3 = R4 = R.
If R3 is replaced by an closed (short) circuit and I2 is known, the current through R2 will be
A. I2 / 2
B. 0
C. ?I2
D. I2
E. 2I2
Answer: B
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Referring to the figure shown below, an inoperative low air warning lamp in the instrument panel cluster with all other gauges and warning lamps working correctly would be most likely caused by which of the following? 
A. Open circuit between the instrument panel cluster and the engine control module (ECM) B. Loose connection at the left dash panel ground stud C. Blown fuse F5-C D. None of the above
Cables are protective devices designed to melt when the flow of current becomes too high for the wiring or loads in the circuit.
Answer the following statement true (T) or false (F)
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?
Pure water boils at a temperature of 212°F at which of the following standard conditions?
A. 12.967psi B. 13.967psi C. 14.967psi D. 15.967psi