Diesel Quiz 4

1.  Some diesel engines have valves hollowed out and filled with what to keep them cool?
a. water.
b. sodium.
c. oil.
d. sand.

2.  Which of the following is the most likely cause of floating valves?
a. worn valve seats.
b. bent pushrod.
c. weak valve springs.
d. too much boost.

3. Sulfur in diesel fuel mixes with water in the combustion process to form?
a. power.
b. lubrication.
c. sulfuric acid.
d. exhaust soot.

4.  What should a diesels water temp be kept at to limit condensation in the combustion process?
a. 100 deg.
b. 300 deg.
c. 140 deg.
d. 175 deg.

5.  A diesel engine oil with a high TBN number can?
a. gel up in cold temps.
b. break down before scheduled.
c. neutralize more acid than a low TBN number.
d. be mixed with K1 kerosene to form parts solvent.

6.  API numbers are given to fuels for what reason?
a. expiration date.
b. sulfur content.
c. measure gravity.
d. moisture content.

7.  Kerosene has a higher API number than #2 diesel.
a. true.
b. false.

8.  The higher the cetane number in fuel the?
a. shorter ignition delay.
b. smoother the combustion.
c. cleaner the exhaust.
d. all the above.

9.  Too raise the boiling point of water, you should?
a. decrease altitude.
b. increase coolant system pressure.
c. add anti freeze.
d. all the above.

10.  Anti freeze concentration should not exceed what?
a. 10%.
b. 20%.
c. 60%
d. 75%.











answers: b,c,c,d,c,c,a,d,d,c.

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