OSV – Assistant Engineer Practice Test

1. 1. What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?
2. 2. In all diesel engines, including those used in offshore oil spill response vessels, at what point in the combustion cycle does ignition actually begin?
3. 3. You are assigned to an offshore supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. How many degrees of crankshaft r...
4. 4. You are assigned to an offshore supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is tu...
5. 5. The anchor handling vessel to which you are assigned has a main propulsion engine of the type shown in the illustration. In terms of piston action, operating cy...

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1. 1. Under what conditions is it permissible to pump machinery space bilges directly overboard without processing by an oily-water separator?
2. 2. What is meant by the term independent bilge suction?
3. 3. Which of the following compressors on a motor ship would most likely operate at approximately 100 psig?
4. 4. The air charge leaving an intercooler, or after cooler of an air compressor can be expected to be __________.
5. 5. Which of the fluids listed is suitable and commonly used as a secondary refrigerant?

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1. 1. After measuring the length to which a section of shoring should be cut, you should cut the shoring __________.
2. 2. Which of the following limitations is correct regarding gas masks, otherwise called filter masks?
3. 3. Which of the devices listed would be safe to use in a compartment with insufficient oxygen?
4. 4. An acceptable method of temporarily sealing a crack formed in the hull of a vessel is to __________.
5. 5. Your ship has run aground and it is necessary to determine whether or not a compartment has flooded. Therefore, you should __________.

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1. 1. In the flow of one cycle of single phase alternating current past any given point in a circuit, how many times will the current peak to a maximum?
2. 2. An unintended path of low resistance bypassing the intended path and allowing passage of an abnormally high amount of current is known as what?
3. 3. Four incandescent lamps are connected in series in a single circuit. If one of the lamp filaments burns out, what will happen to the other lamps?
4. 4. Which statement is true concerning the total power consumed in a parallel circuit?
5. 5. How is the power dissipated as heat in a simple direct current circuit consisting of one resistive load calculated?

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