Technician A says that advancing diesel fuel injection timing by one degree can cause greatly increased NOx in the end gas. Technician B says that retarding diesel fuel injection timing tends to increase the output of HC in the exhaust gas. Who is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: C

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Use the following engine dimensions to calculate the compression ratio

Bore: 13.50 cm Stroke: 15.80 cm Gasket thickness: 0.20 cm Deck height: 0.30 cm Piston dish volume: 52.8 cc Combustion chamber volume: 0 cc A) 19.5:1 B) 19.8:1 C) 19.2:1 D) 20.2:1

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When an ac voltage is supplied to an RL circuit, the ac's current and amplitude will be:

A) lagging the voltage. B) varying in the same manner. C) similar in waveform. D) all of these.

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Which important function does a cripple jack rafter serve in roof framing?

A) Provides a designated area for walking on the roof B) Provides nailing areas for roof sheathing C) Increases surface area of the roof D) Decreases structural integrity of the roof

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Break lines are used to terminate features on a drawing when the extent of the feature has been clearly defined and no additional detail is needed.

Answer the following statement true (T) or false (F)

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