QMED, Revision & Practice Exams

Which of the projections represents the left side view of the object "X" in the illustration? Illustration GS-0022

1. A ✓
2. B
3. C
4. D

It is necessary to cool the bulkheads and decks surrounding a compartment where there is a fire in order to __________.

1. cool the metal below its ignition temperature
2. form a dense coating of smothering steam
3. prevent oxygen from reaching the flames
4. prevent the fire from spreading by the conduction of heat ✓

Under normal conditions, the rate of heat transfer in a feedwater heater is most greatly affected by the __________.

1. pH of the feedwater
2. temperature differential between the steam and feedwater ✓
3. density of the feedwater
4. speed of the main feed pump

Which of the following statements concerning fire-tube boilers is correct?

1. Combustion gases flow through the tubes. ✓
2. Flames impinge on the tubes.
3. Combustion occurs in the tubes.
4. Water flows through the tubes.

The component shown in the illustration, labeled "I", is the __________. Illustration SE-0013

1. second reduction pinion
2. first reduction gear ✓
3. first reduction pinion
4. second reduction gear

What is the characteristic of a wound-rotor induction motor, with a high resistance inserted in series with the rotor winding at startup?

1. relatively high starting torque and high stator current
2. relatively low starting torque and high stator current
3. relatively low starting torque and low stator current
4. relatively high starting torque and low stator current ✓

In the illustration shown, the sea painter is identified as item number _____. Illustration SF-0043

1. 3
2. 6
3. 7 ✓
4. 9

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.

When opening or closing compressor service and line isolation valves on a typical refrigeration system that is fitted with packed valves, what must you do?

1. you must first remove the stem seal cap ✓
2. you should replace the gasket each time the valve position is changed
3. you should turn valves slowly to avoid thermal stresses due to low temperatures
4. you should never loosen or tighten the packing gland

What is an engine room bilge oily-water separator designed to do?

1. Remove small amounts of water from small amounts of oil.
2. Remove small amounts of water from large amounts of oil.
3. Remove small amounts of oil from large amounts of water. ✓
4. Remove small amounts of oil from small amounts of water.

If a fire broke out in an automation console, you would first secure the power and then proceed to use which of the listed hand portable fire extinguishers?

1. CO2 ✓
2. Dry chemical
3. Soda acid
4. Foam

What statement is true concerning the illustrated steam turbine bearing lubricating oil flow and temperature indicating device? Illustration SE-0010

1. The thermometer indicates the temperature of the oil leaving the bearing and the sight glass indicates the flow of the oil leaving the bearing as well. ✓
2. The thermometer indicates the temperature of the oil entering the bearing and the sight glass indicates the flow of the oil leaving the bearing.
3. The thermometer indicates the temperature of the oil entering the bearing and the sight glass indicates the flow of the oil entering the bearing as well.
4. The thermometer indicates the temperature of the oil leaving the bearing and the sight glass indicates the flow of the oil entering the bearing.

In a diesel engine closed freshwater cooling system employing a radiator, proper water temperature can be obtained by _________.

1. passing cooling water through the lube oil cooler
2. piping exhaust gases across the radiator front
3. adjusting the radiator louvers ✓
4. passing cooling water through a space heater

Guardian valves are installed on main propulsion turbines to ______.

1. provide a means to supply steam directly to the astern element of the turbine
2. provide an emergency means of quickly closing the throttle
3. prevent steam from leaking into the astern element while at full sea speed ✓
4. prevent steam from leaking into the astern element while the vessel is maneuvering

As shown in the illustrated D type single furnace boiler, what does item "F" represent? Illustration SG-0008

1. Superheater tubes
2. Generating tubes ✓
3. Desuperheater tubes
4. Screening tubes

Which of the following statements correctly describes the construction of the close coupled sanitary pump shown in the illustration? Illustration GS-0070

1. The pump and motor have a common shaft. ✓
2. The pump housing and motor frame provide for radial adjustment of the shaft coupling.
3. The pump impeller is classified as double suction.
4. The pump suction and discharge connections are made with screwed pipe fittings.

A dirty diesel engine oil filter element can best be detected by _________.

1. the pressure drop across the filter ✓
2. high lube oil sump temperature
3. decrease in oil viscosity from the filter
4. visual inspection of the elements

What is used to prevent contamination of a potable water system supplying a plumbing fixture such as a galley sink from a backup of sewage sanitary drains?

1. Location of the potable water spigots below the rim of the galley sink.
2. A "P" trap in the drain line draining sewage waste from the galley sink.
3. Location of the potable water spigots above the rim of the galley sink. ✓
4. Check valves in the potable water supply lines delivering water to the galley sink.

Which of the tanks shown in the illustration supplies fuel to the emergency generator? Illustration MO-0058

1. Diesel Oil Service Tank ✓
2. Diesel Oil Settling Tank
3. Diesel Oil Boiler Tank
4. Diesel Oil Booster Tank

The purpose of the main reduction gears is to __________.

1. provide a means of reversing the main engines in an emergency
2. transmit vibration and thrust to the ship's hull
3. reduce engine room noise levels during high-speed operations
4. reduce high turbine RPM to an efficient propeller RPM ✓

The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust __________.

1. gas composition
2. gas temperature ✓
3. pressure
4. timing

To properly clean a burner tip, you should use __________.

1. light sand blast grit
2. a soft metal tool ✓
3. a jack knife
4. a wire brush

A two-stroke cycle diesel engine requires less starting air than a four-stroke cycle diesel engine, of equal displacement, because the two-stroke cycle diesel engine ______.

1. has little or no internal friction
2. has a lower effective compression ratio
3. operates with scavenge air under a positive pressure
4. operates without energy absorbing intake and exhaust strokes ✓

The device shown in the illustration is a/an __________. Illustration GS-0116

1. diesel engine motor mount
2. vane type steering gear ✓
3. oil scraper ring stuffing box for a crosshead engine
4. mechanical shaft seal

According to the illustrated main and auxiliary diesel engine cooling water systems diagram, which of the following heat exchangers uses high temperature fresh water (jacket water) as a source of heat? Illustration MO-0129

1. Camshaft lube oil cooler
2. Scavenge air cooler(s)
3. Fresh water generator (evaporator) ✓
4. Jacket water cooler

The process of boiling sea water in order to separate it into freshwater vapor and brine is usually defined as ________.

1. condensation
2. evaporation ✓
3. dehydration
4. dissolution

What is the purpose of the main steam stop bypass valve?

1. cross-connect two steaming boilers
2. supply auxiliary steam when the main steam stop is closed
3. isolate the main steam stop for repairs while steaming
4. gradually increase the pressure and temperature of the main steam piping when warming up ✓

Moisture is removed from recovered refrigerant using a recycling machine by what means?

1. purging non-condensables off the top of the recovery cylinder
2. condensing the moisture in the condenser
3. opening a drain petcock on the oil separator
4. circulating the refrigerant through a dehydrator ✓

The individual 6-volt lead-acid batteries, when connected as shown in the illustration, as a battery bank would produce how many volts? Illustration EL-0070

1. 6 ✓
2. 12
3. 18
4. 24

When treating a person for third degree burns, you should __________.

1. cover the burns with thick sterile dressing ✓
2. submerge the burn area in cold water
3. make the person stand up and walk to increase circulation
4. break blisters and remove dead tissue

Which practices should be followed at all times when using an electric grinding machine?

1. Be properly trained in the use of this tool.
2. Wear goggles or face shield.
3. Be certain that the frame is properly grounded.
4. Each of the above practices. ✓

In the system shown in the illustration, the engine room station is unable to signal any other station, nor is any other station able to signal the engine room station. The engine room station can, however, ring itself by proper positioning of its selector switch. What is the most probable cause of this problem? Illustration EL-0093

1. The switch at component "A" of the problem station is stuck open.
2. The selector switch is grounded at the problem station diverting current from the other stations' ringing devices.
3. The coil of component "C" of the problem station is open-circuited.
4. There is an open between terminal "C" of the problem station and the common wire of the multi-conductor cable to the other stations. ✓

When administering first aid you should avoid __________.

1. instructing bystanders
2. any conversation with the patient
3. touching the patient
4. unnecessary haste and appearance of uncertainty ✓

Traditionally, which of the listed refrigerants has been more suitable than the others for use in a centrifugal refrigeration compressor?

1. R-11 ✓
2. R-12
3. Ammonia
4. Carbon dioxide

In a compression type automatic grease cup, the lubricant is forced into the bearing by __________.

1. a pressure gun
2. gravity flow
3. a Zerk fitting
4. spring force ✓

Water ballast placed in a tank that has been crude oil washed, but not water rinsed, shall be regarded as _________.

1. dirty ballast ✓
2. segregated ballast
3. clean ballast
4. crude oil

Which of the illustrated motors has a totally enclosed, fan-cooled (TEFC) motor enclosure? Illustration EL- 0001

1. A ✓
2. B
3. C
4. D

When changing fuses, what safety precaution should be taken after ensuring that the circuit is dead?

1. use a fuse puller ✓
2. wear safety glasses
3. stand on a rubber mat
4. wear rubber boots

If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be _______.

1. filled with water
2. gas freed
3. inerted
4. all of the above as necessary ✓

In a refrigeration system, from what location would air and non-condensable gases be removed?

1. the bottom of the receiver drain connection
2. compressor oil fill connection
3. expansion valve equalizer connection
4. the top of the condenser purge connection ✓

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

What type of grease is the most commonly used aboard ship?

1. Lime-based grease
2. Calcium-based grease
3. Lithium-based grease ✓
4. Aluminum-based grease

If you hear the general alarm sounded 3 times supplemented by 3 short blasts of the whistle, what does this indicate?

1. Dismissal from a boat drill.
2. Dismissal from fire and emergency. ✓
3. Abandon ship.
4. Fire and emergency.

In what application is a remote valve operator most likely to be located outside the machinery space when the valve itself is located within the machinery space?

1. A valve located in a compressed air line.
2. A valve located in a fuel oil transfer line. ✓
3. A valve located in a potable water transfer line.
4. A valve located in a sea water cooling line.

As shown in figures "B" and "C" of the illustration, what should be the switch position and which test lead terminal jacks should be used if your intent is to measure DC currents anticipated as high as 200 milliamps? Illustration EL-0047

1. switch position "7" and terminal jacks "1 and 4"
2. switch position "6" and terminal jacks "2 and 4"
3. switch position "6" and terminal jacks "1 and 4" ✓
4. switch position "7" and terminal jacks "2 and 4"

Whether analog or digital, what are most AC voltmeters calibrated to measure?

1. peak-to-peak voltage
2. average voltage
3. peak voltage only
4. root-mean-square voltage ✓

An increase in which of the listed conditions will increase the speed of a synchronous electric motor?

1. Inductance
2. Voltage
3. Frequency ✓
4. Armature current

In comparing a semiconductor diode to a vacuum tube diode, what statement is true?

1. The semiconductor diode has shorter life, no warmup time, and is less delicate than the vacuum tube diode.
2. The semiconductor diode has longer life, no warmup time, and is less delicate than the vacuum tube diode. ✓
3. The semiconductor diode has longer life, longer warmup time, and is less delicate than the vacuum tube diode.
4. The semiconductor diode has longer life, no warmup time, and is more delicate than the vacuum tube diode.

Why is it important for double bottom fuel oil tanks not to be topped off when loading fuel at cold temperatures?

1. Air pockets may cause the fuel to bubble out of the ullage hole.
2. Increased viscosity of the product needs higher loading pressure, which increases the chances of a spill.
3. Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened.
4. A temperature rise of the fuel will cause an overflow from the tank vent. ✓

The FIRST requirement for logical troubleshooting of any system requires the troubleshooter to do what?

1. isolate the faulty component
2. recognize what is normal operation ✓
3. identify the probable cause of a symptom
4. determine what tools you will need

To minimize magnetic field interaction between electrical conductors in physical proximity, what is the best practice?

1. at right angles and as close as possible to each other
2. at right angles and as far as practicable from each other ✓
3. parallel to and as far as practicable from each other
4. parallel and as close as possible to each other

The illustrated drawing shows a correct front "F" and top "T" view of an object. Of the views labeled "1","2","3", and "4", the one that correctly represents the right side view for a third angle projection is_______. Illustration GS-0132

1. 1
2. 2 ✓
3. 3
4. 4

The hand brake of a lifeboat winch is _________.

1. manually disengaged when hoisting a boat
2. applied by dropping the counterweighted lever ✓
3. controlled by the centrifugal brake mechanism
4. automatically engaged if lowering speed is excessive

When fighting a fire with a portable dry chemical extinguisher you should always __________.

1. bounce the chemical onto the fire from adjacent structural members
2. attack the fire from the leeward side
3. direct the stream of chemical toward the base of the fire ✓
4. spray the chemical across the tops of the flames

If the compressor is heard to knock while pumping down the low side for repairs, but otherwise the compressor sounds normal, this is a possible indication of what condition?

1. worn piston rings
2. faulty bearings
3. air being introduced to the system
4. foaming of the crankcase oil ✓

To obtain a 1/2 inch per foot taper on an 18-inch workpiece, the tailstock of the lathe must be set over _________.

1. 3/8 inch ✓
2. 1/2 inch
3. 3/4 inch
4. 7/8 inch

When installing DANGER tags when performing a tag-out and lock-out procedure in preparation for accomplishing maintenance, what is the color of these tags?

1. Green
2. Yellow
3. Orange
4. Red ✓

To find the relative humidity of an accommodation space, you would use a __________.

1. Entropy Chart
2. Enthalpy Chart
3. Mollier Chart
4. Psychrometric Chart ✓

The tool used to prepare copper tubing for the installation of fittings is called a _________.

1. stretcher
2. flaring tool ✓
3. swaging tool
4. spreader

Bottom blow valves are installed on auxiliary water-tube boilers to _______.

1. completely drain the boiler in an emergency
2. prevent sludge from forming in the steam drum
3. remove floating impurities from the boiler water surface
4. remove settled solids from the water drum ✓

Which recovery procedure should be used to minimize the loss of oil from the system during the recovery of refrigerant from small appliances such as a water cooler?

1. vapor-liquid recovery
2. vapor recovery ✓
3. liquid recovery
4. initial recovery

As shown in the illustrated DC machine which is configured as a generator, what is the purpose of the interpoles? Illustration EL-0052

1. counteract armature reaction to maintain the brushes in the neutral plane to minimize brush sparking ✓
2. statically balance the stator for uniform weight distribution
3. provide residual magnetism to facilitate an output by means of self-excitation
4. strengthen the main field above and beyond the capability of the main field poles

Low compressor head pressure in a refrigeration system can be caused by which of the following?

1. excessive condenser cooling water flow ✓
2. air in the refrigeration system
3. insufficient condenser cooling water flow
4. excessive refrigerant in the system

What is true concerning frost build-up on the evaporator coils of a multi-box direct expansion refrigeration system?

1. the frost will increase the refrigeration effect
2. the frost can be removed by passing hot gas through the coils or energizing defrost heaters with the evaporator fan shut down ✓
3. the frost can be quickly removed by simply shutting down the compressor
4. the frost can be removed by passing hot gas through the coils or energizing defrost heaters with the evaporator fan still running

What material is most commonly used as a sacrificial anode for the purposes of minimizing the galvanic corrosion of steel and cast iron?

1. Platinum
2. Brass
3. Zinc ✓
4. Bronze

The portion of a hydraulic hose that determines its overall strength, is the _______.

1. braided inner layer(s) ✓
2. outer cover
3. inner tube
4. outer armor

Which of the hand valve configurations for the gauge manifold set is the correct set up for monitoring both the low and high system pressures? Illustration RA-0003

1. A
2. B
3. C
4. D ✓

According to the illustrated main and auxiliary diesel engine cooling water systems diagram, which of the following heat exchangers are connected directly in series with one another? Illustration MO-0129

1. Jacket water cooler and scavenge air cooler(s)
2. Camshaft lube oil cooler and jacket water cooler
3. Camshaft lube oil cooler and scavenge air cooler(s)
4. Lube oil cooler and jacket water cooler ✓

What device on the bridge shows the rudder's position?

1. rudder angle indicator ✓
2. follow-up gear
3. telemotor position
4. Rapson slide indicator

R-134a is often the replacement for which older type of refrigerant?

1. R-12 ✓
2. R-22
3. R-11
4. R-123

In terms of the completeness of combustion, in viewing the flame through the peephole, what would be the indication of the LEAST complete combustion?

1. Golden yellow flame
2. Reddish flame ✓
3. Orange flame
4. Yellow flame

Which of the fuel injection systems listed uses a spring-loaded differential spray needle valve and an individual pump for each cylinder?

1. Common rail injection
2. Air injection
3. Jerk pump injection ✓
4. Distributor injection

On a large diesel engine installation, crankshaft axial alignment is maintained by the ________.

1. piston rod guides
2. engine thrust bearing ✓
3. crosshead bearing
4. main shaft flexible coupling

In the event of a failure of the pneumatic control system, a multi-element feedwater regulator is designed to operate as a _________.

1. thermo-hydraulic feedwater regulator
2. manually controlled feedwater regulator ✓
3. constant-pressure regulator
4. constant-volume feedwater regulator

When performing a bottom blow on a boiler, what valve is spun open quickly?

1. All valves are to be opened slowly.
2. Guarding valve (second valve away from the water drum) ✓
3. Skin valve (last valve prior to overboard opening)
4. Blow down valve (first valve closest to water drum)

How is the emergency bilge suction valve typically used?

1. to inject cleaning additives when the bilges are extremely dirty
2. when the main condenser becomes fouled, in order to provide additional cooling water circulation
3. if the bilges become flooded and they cannot be emptied by any other means ✓
4. to connect the rose box to the independent bilge suction

Why are two fuel oil heaters "E" provided in the fuel oil system shown in the illustration? Illustration SG-0009

1. Two heaters are necessary when both boilers steam at full load.
2. To provide a backup in case one of the heaters becomes inoperable. ✓
3. To allow fuel of different temperatures to be provided to each boiler.
4. Each heater supplies fuel to a different boiler.