Which of the following is true of a cooled exhaust gas recirculation (C-EGR) system on a truck diesel engine?
A. lowers HC emissions
B. lowers NOx emissions
C. lowers both HC and NOx emissions
D. improves engine efficiency
Answer: B
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Explain the general purpose of a compound curve and a reverse curve.
What will be an ideal response?
A diesel engine produces a vibration complaint. Which of the following would be the more likely cause?
A. oil level in pan at low mark on dipstick B. dent in the viscous vibration damper C. broken cylinder head bolt D. advanced injection timing
Why is it dangerous to drill out orifices in metering devices?
A) The metal is too soft to drill through. B) The orifices are rectangular in shape. C) The metal is too hard to drill through. D) The orifices are conical in shape.
Which phase angle is generated by a three-phase motor?
A. 30 B. 90 C. 120 D. 180