Technician A says one advantage of a variable valve timing system is that it allows a higher-compression engine to burn a lower octane fuel while still being able to control the potential for detonation. Technician B says that most VVT systems use engine oil pressure to control them hydraulically. Who is correct?
A. Technician A only
B. Technician B only
C. Both technicians
D. Neither technician
Answer: C
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Determine if the selection of system GH or B3 is sensitive to variation in the return required by management. Depending on the type of project, the corporate MARR ranges from 8% to 16% per year on different projects. (a) Write the AW equations to find the values by hand. (b) Solve using a spreadsheet at 2% increments, develop the AW versus MARR graph, and find the breakeven MARR between GH and B3.
 FIGURE 1.png)
What is the resonant frequency of a tank circuit with a 50 mH inductor and C = 256 pF capacitor?
A) 4.45 kHz B) 44.5 Hz C) 44.5 kHz D) 445 kHz
The density of air at a city (such as San Diego) located at sea level is 1.225 kg/m^3, while for a city (such as Denver) located at high altitude is 1.048 kg/m3. Consider two auditoriums, each with dimensions of 100 ft ×150 ft ×20 ft, one located in San Diego, and the other in Denver. Calculate the mass of air for each auditorium. Express your answer in kg, lbm, and slugs.
What will be an ideal response?
If records show that thermodynamic traps on one particular installation suffer repeatedly from rapid wear, the trap may be _____.
a. dirty b. the wrong type c. overpressurizing d. oversized