UFIV – Assistant Engineer, Revision & Practice Exams

Which of the following conditions represents a particular advantage of using a positive pressure type self- contained breathing apparatus in an atmosphere that is immediately dangerous to life or health?

1. The positive pressure in the facepiece prevents contaminated air from entering the facepiece. ✓
2. The average operating time for most air cylinders is over an hour.
3. The equipment is compact and the wearer can work in confined spaces without difficulty.
4. The equipment used is lightweight and easy to wear by reducing physical strain on the wearer.

The rudder torque capacity of the four-ram steering gear illustrated, is rated at 44,210,000 inch-pounds with one power unit in operation. If the four-ram system was able to be operated as a two-ram system with both power units on line, what would be the available torque? Illustration GS-0067

1. 11,052,500 inch-pounds
2. 22,105,000 inch-pounds ✓
3. 44,210,000 inch-pounds
4. 88,420,000 inch-pounds

Periodic testing using a special sensing device may be performed to detect potentially dangerous loose or corroded bus bar and controller connections. What is the name of this testing technology?

1. infra-red thermography ✓
2. corrosion electrolysis
3. visual pyrotronics
4. electric vibro-analysis

Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?

1. 10.0%
2. 15.8%
3. 20.8% ✓
4. 25.8%

In heavy seas the helmsman should steer the survival craft __________.

1. into the seas ✓
2. broadside to the seas
3. in the same direction as the seas
4. in a series of figure-eights

In the absence of external forces, the center of gravity of a floating vessel is located directly above the __________.

1. geometric center of the displaced volume ✓
2. center of flotation
3. metacenter
4. amidships

If the cause of severe list or trim of a vessel is due to off-center ballast, counter-flooding into empty tanks will __________.

1. increase the righting moment
2. increase the righting arm
3. increase list or trim
4. decrease list or trim ✓

In a series circuit, what is the applied voltage (or sum of the applied voltages) equal to?

1. the total current divided by the total resistance
2. the sum of the individual currents multiplied by the number of resistors
3. the total resistance divided by the total current
4. the sum of the individual voltage drops ✓

What is the most reliable and preferred method for determining the state of charge of a wet cell NiCad battery while it is being charged?

1. Measuring the battery voltage with a digital voltmeter. ✓
2. Measuring the temperature corrected specific gravity of each cell with a hydrometer and thermometer.
3. Measuring the battery voltage with a solenoid type voltage tester.
4. Measuring the specific gravity of each cell with a hydrometer.

What is the basic similarity between a circuit breaker and a fuse?

1. a circuit breaker and a fuse have no similarities
2. after a short or overload condition, both have to be replaced before the circuit can be re-energized
3. after a short or overload condition, both should open to de-energize the circuit ✓
4. after a short or overload condition, both must be reset to re-energize the circuit

What is meant by the term "deadband" as it applies to prime mover speed control governors?

1. Deadband is the result of transient speed changes of a prime mover as the governor responds to load changes.
2. Deadband is the repeated variation of speed due to under-control by the governor and a lack of governor power.
3. Deadband is the repeated and sometimes rhythmic variation of speed due to over-control by the governor.
4. Deadband is the change in speed required before the governor will initiate a corrective action as the result of a load change. ✓

Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.

1. fluid as friction
2. hydraulic piping flexibility
3. reservoir expansion chamber
4. atmosphere as heat ✓

A tank has been sealed and unventilated for a long period of time. Which of the following statements is true?

1. The tank is safe to enter.
2. The tank is especially dangerous to enter. ✓
3. Carbon monoxide is present.
4. Water vapor present when the tank was sealed has oxidized.

For diesel engines, such as those used for main propulsion and auxiliary power on fishery research vessels, while running at speed, how is the ignition of fuel within the cylinder achieved?

1. Ignition is achieved by the heat of compression created by compressing the air/fuel mixture within the cylinder into a relatively small volume.
2. Ignition is achieved by the heat of compression created by compressing intake/charge air within the cylinder into a relatively small volume. ✓
3. Ignition is achieved by a high voltage electric spark induced across the gap of a specially designed spark plug.
4. Ignition is achieved by intense heat by passing electric current through the element of a specially designed glow plug.

You are assigned to a fishing factory ship fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 720 rpm, what will be the rotational speed of the two camshafts? Illustration MO-0005

1. 360 rpm ✓
2. 720 rpm
3. 1440 rpm
4. Not enough information is given to determine camshaft rpm

You are assigned as an engineer on a fishing research vessel using main propulsion engines of the type shown in the illustration. What statement represents the procedure for inspection of the upper cylinder liner bore while in place inside the engine? Illustration MO-0122

1. With the particular piston positioned at TDC and the corresponding oil pan handhole cover removed, inspect the upper liner bore through the scavenging air ports.
2. With the particular piston positioned at BDC and the corresponding oil pan handhole cover removed, inspect the upper liner bore through the scavenging air ports.
3. With the particular piston positioned at BDC and the corresponding air box handhole cover removed, inspect the upper liner bore through the scavenging air ports. ✓
4. With the particular piston positioned at TDC and the corresponding air box handhole cover removed, inspect the upper liner bore through the scavenging air ports.

When starting a deck winch drive engine in preparation for seine net handling operations, what parameter must be checked FIRST upon start-up to avoid immediate engine damage?

1. Fuel oil supply header pressure.
2. Engine lubricating oil supply header pressure. ✓
3. Winch gear oil pump discharge pressure.
4. Cylinder jacket water pump discharge pressure.

The main propulsion diesel engines fitted on your uninspected fishing industry vessel are started with vane- type air-starting motors. What statement concerning air-start motor lubricator maintenance is true? (Assume a metal bowl fitted with a tubular sight glass.)

1. The lubricator reservoir bowl should be re-filled with clean oil when the level is no longer visible in the glass.
2. The lubricator reservoir bowl should be re-filled with clean oil as soon as the level drops to the very upper part of the glass.
3. The lubricator reservoir bowl should be re-filled with clean oil when it becomes approximately half full as shown in the glass. ✓
4. The lubricator reservoir bowl should be re-filled with clean oil when it is estimated that the bowl is completely empty.

The uninspected fishing trawler to which you are assigned has diesel generators fitted with unit injectors with the operating principle as shown in the illustration. What statement is true concerning the beginning and ending of injection? Illustration MO-0144

1. Injection begins when the upper fuel port is covered by the upper helix of the downward moving plunger, and injection ends when the lower fuel port is uncovered by the lower helix of the downward moving plunger. ✓
2. Injection begins when the lower fuel port is covered by the lower helix of the downward moving plunger, and injection ends when the upper fuel port is uncovered by the upper helix of the downward moving plunger.
3. Injection begins when the upper fuel port is covered by the upper helix of the upward moving plunger, and injection ends when the lower fuel port is uncovered by the lower helix of the upward moving plunger.
4. Injection begins when the lower fuel port is covered by the lower helix of the upward moving plunger, and injection ends when the upper fuel port is uncovered by the upper helix of the upward moving plunger.

The turbocharged, four-stroke, main propulsion diesel engines on your fishery research vessel are protected with dry-type air intake filters. The engines are fitted with dial-type restriction indicators measuring the pressure in the air duct between the air intake filter and the turbocharger blower inlet. Under what conditions should the air intake filters be evaluated using the restriction indicators?

1. The engine should be running at rated RPM with full load (propulsion clutch engaged). ✓
2. The engine should be running at idle RPM with minimal load (propulsion clutch engaged).
3. The engine should be running at rated RPM with no load (propulsion clutch disengaged).
4. The engine should be running at idle RPM with no load (propulsion clutch disengaged).

The fishing industry seiner to which you are assigned has an engine as shown in the illustration. What statement concerning air box and exhaust manifold pressure is true, if the engine is running at rated speed? Illustration MO-0224

1. The exhaust manifold pressure will be lower than the air box pressure. ✓
2. The exhaust manifold pressure will be higher than the air box pressure.
3. The exhaust manifold pressure will be equal to the air box pressure.
4. There is no predictable, consistent relationship between the exhaust manifold and air box pressures.

Assuming the use of low sulfur content diesel fuel, what combination of conditions associated with uninspected fishing industry vessel engine room operations would most contribute to internal corrosion of exhaust systems?

1. Low ambient temperature and low engine load ✓
2. Low ambient temperature and high engine load
3. High ambient temperature and low engine load
4. High ambient temperature and high engine load

The freshwater cooling systems serving the main engines of your uninspected fishing industry vessel are of the type shown in the illustration. What statement accurately describes the characteristics of the freshwater cooling circuit? Illustration MO-0137

1. The freshwater circuit is a vented system using an automotive type 2-way thermostatic control valve for temperature control.
2. The freshwater circuit is a vented system using a stationary/marine type 3-way thermostatic control valve for temperature control. ✓
3. The freshwater circuit is a pressurized system using an automotive type 2-way thermostatic control valve for temperature control.
4. The freshwater circuit is a pressurized system using a stationary/marine type 3-way thermostatic control valve for temperature control.

The two-stroke cycle main propulsion engines on the fishing trawler to which you are assigned are fitted with Roots-type blowers for scavenging purposes. Upon inspection of the air boxes, what condition would indicate a need to replace the Roots-type blower immediately?

1. Iron dust residue
2. Oil accumulations
3. Aluminum dust residue ✓
4. Water accumulations

While underway in open waters on your commercial crabbing vessel, the low clutch air pressure alarm sounds and the faint odor of burning rubber is detected. What is the appropriate response?

1. Bring the throttle and clutch control to the stop position, then investigate the cause of low clutch air pressure. ✓
2. Reduce the load and speed on the engine, then investigate the cause of low clutch air pressure.
3. Investigate the cause of low clutch air pressure, then bring the throttle and clutch control to the stop position if necessary.
4. Investigate the cause of low clutch air pressure, then reduce the engine load and speed if necessary.

The pneumatic propulsion control system used on the fishing vessel to which you are assigned uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper method for lubrication upon reassembly? Illustration MO-0052

1. O-rings should be lubricated with desiccant powder.
2. O-rings should be lubricated with a silicone-based grease. ✓
3. O-rings should be lubricated with penetrating oil.
4. O-rings should not be lubricated by any means.

When inspecting a survival craft, you should check to make sure that the __________.

1. sea anchor is deployed
2. hydraulic starting system has been drained
3. hydraulic pressure is within the specified range ✓
4. steering controls are locked

Using a sea anchor when in a life raft will __________.

1. reduce the drift rate of the life raft ✓
2. keep the life raft from turning over
3. aid in recovering the life raft
4. increase your visibility

A magnesium fire would be classified as a __________.

1. class "A"
2. class "B"
3. class "C"
4. class "D" ✓

If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are sea water-cooled, what statement is true?

1. Sea water flows through the shells of both the lube oil and jacket water coolers.
2. Sea water flows through the tubes of the lube oil cooler and through the shell of the jacket water cooler.
3. Sea water flows through the tubes of both the lube oil and jacket water coolers. ✓
4. Sea water flows through the tubes of the jacket water cooler and through the shell of the lube oil cooler.

With an increase in temperature, the volume of hydraulic fluid __________.

1. remains constant if pressure decreases
2. increases ✓
3. remains the same
4. contracts

A precharged bladder-type accumulator used in a hydraulic system, can be potentially dangerous if __________.

1. it is precharged with dry nitrogen
2. compressed air is used rather than an inert gas ✓
3. the bladder contacts the top of the poppet
4. the inert gas is exposed to hydraulic oil

Which of the drill sizes listed represents the largest size drill?

1. A
2. X
3. Z ✓
4. XX

Which of the illustrated motors has an open motor enclosure? Illustration EL-0001

1. A
2. B ✓
3. C
4. D