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Q170 Practice Quiz
Deck General and Safety. The real paper is 50 questions and you need 35 correct (70%) to pass. There are 50 questions here. Take a mock exam weighted the way the paper is, or drill one topic. Every answer links to the material that settles it.
All 50 questions
Grouped by topic, heaviest first. Click a question to see its answer and the material behind it.
Fire Prevention and Firefighting
11 questions · 22% of the paper
What is required in addition to the heat, fuel, and oxygen of the fire triangle to have a fire?
- Electricity
- Pressure
- Smoke
- Chain reaction ← correct
Where would spontaneous combustion most likely to occur?
- In dirty swabs and cleaning gear
- In rags soaked in linseed oil ← correct
- In partially loaded fuel tanks
- In overloaded electrical circuits
Spontaneous ignition can result from __________.
- worn electrical wires on power tools
- an unprotected drop-light bulb
- careless disposal or storage of material ← correct
- smoking in bed
Fire extinguishing agents used on class C fires must have which characteristic?
- Non-conducting ← correct
- Non-toxic
- Able to absorb heat
- Water based
Which extinguishing agent is/are suitable to combat a class B fire in an engine compartment?
- Carbon dioxide
- Dry chemical
- Foam
- All of the above ← correct
If heavy smoke is coming from the paint locker, what should be the FIRST firefighting response?
- Release the CO2 flooding system
- Secure the ventilation ← correct
- Open the door to evaluate the extent of the fire
- Enter and use a portable extinguisher
CO2 mainly extinguishes a fire by which of the following?
- Smothering ← correct
- Chemical action
- Cooling
- All of the above
Which is an advantage of an ABC dry chemical over a carbon dioxide extinguisher?
- Less damage to electrical components
- Greater multipurpose extinguishing ability ← correct
- Lack of toxicity
- Burn-back protection
What is NOT listed on the metallic name plate that is required to be attached to hand portable fire extinguishers according to uninspected vessel regulations?
- An identifying mark of the actual manufacturer
- The name of the item
- The rated capacity in gallons, quarts, or pounds
- The hydrostatic test date of the cylinder ← correct
According to uninspected vessel regulations, what is the minimum number of portable fire extinguishers required on board a 45-foot motorboat built in 2017 having a fixed fire system on board?
- 1 5-B
- 2 5-B ← correct
- 3 5-B
- 4 5-B
How does good housekeeping prevent fires on a vessel?
- Improving personnel qualifications
- Eliminating trip hazards
- Eliminating potential fuel sources ← correct
- Allowing better access in an emergency
Vessel Maneuvering and Handling
7 questions · 14% of the paper
Which is a predictable result of a vessel nearing a bank or edge of a steep banked channel?
- The vessel will be drawn bodily into the bank unless the engines are stopped
- The bow sheers toward the bank
- The stern is drawn to the bank as the bow sheers off ← correct
- The vessel continues in a straight line, but with greatly reduced maneuverability
You are making a sharp turn in a channel and using a buoy four points on the bow to gauge your rate of turn. If you observe the buoy moving forward relative to you, what should you do?
- Increase speed
- Increase the rate of turn
- Decrease the rate of turn ← correct
- Maintain a constant rate of turn
You are docking a vessel. When are the wind and current most favorable in this situation?
- When they are crossing your course, both in the same direction
- When they are both setting you on the pier
- When they are both parallel to the pier from ahead ← correct
- When they are crossing your course, in opposite directions to the other
After casting off moorings at a mooring buoy in calm weather, which action should you take?
- Go half ahead on the engines and put the rudder hard right
- Go half ahead on the engines and pass upstream of the buoy
- Go full ahead on the engine(s)
- Back away a few lengths to clear the buoy and then go ahead on the engines ← correct
When is the effect of wind on exposed areas of the vessel most noticeable?
- When turning
- When going full ahead
- When backing ← correct
- When going slow ahead
The possibility of wake damage can be reduced by following which action?
- Slow down when passing moored vessels ← correct
- Alternate engine speeds
- Apply rudder in both port and starboard directions
- Passing close aboard to the moored vessel
While proceeding up a narrow waterway you observe a vessel berthed in the river with slack mooring lines. Which is the most prudent action to take FIRST?
- Contact the moored vessel
- Reduce the speed of your vessel ← correct
- Give 5 short blasts on the whistle
- Call the US Coast Guard
Marlinspike Seamanship
5 questions · 10% of the paper
How is a safety shackle identified?
- The design of the pin ← correct
- The certification stamp
- The shape
- The color code
Which term describes the rope which is rove through a tail block to be used with a bosun's chair?
- Strop
- Gantline ← correct
- Life line
- Whip
Which factor is most likely to impair the strength and durability of synthetic line?
- Dry rot
- Washing with mild soap
- Sunlight ← correct
- Mildew
Which letter in illustration D030DG below represents a plain whipping?
This question is asked against Coast Guard illustration D030DG, which we cannot reproduce — the examination drawings are adapted from copyrighted works. To work it you need the illustration in front of you.
- J ← correct
- V
- E
- F
Which of the following describes a fid?
- A sharp pointed crowbar used to unlay wire rope
- A mallet used when splicing wire rope
- A tapered wooden pin used when splicing heavy rope ← correct
- A tapered steel pin used to separate wire rope
Anchoring, Mooring, Berthing and Unberthing
4 questions · 8% of the paper
Which lines primary function is to reduce the fore and aft motion of a docked vessel?
- The bow and stern lines ← correct
- The breast lines
- The quarter breast lines
- The bow cross spring lines
Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?
- Crossing the spring lines ← correct
- Slacking bow and stern lines
- Slacking all forward running lines while keeping all after running lines taut
- Doubling up on spring or breast lines
Which type of bottom is best suited for holding an anchor of a small boat?
- Mud and clay ← correct
- Rocky
- Sandy
- Gravel
Which is TRUE when you pay out more anchor cable?
- This action decreases the swing of your vessel while at anchor
- This action will decrease the holding power of your anchor
- This action will increase the holding power of your anchor ← correct
- This action will increase the possibility that your vessel will drag anchor
Lifesaving and Survival
4 questions · 8% of the paper
When a ship is abandoned and there are several liferafts in the water, which task must be done to aid in your rescue?
- Transfer all the injured to one raft
- Transfer all supplies to one raft and post a guard
- Separate the rafts by drifting away to increase chances of detection
- Secure the rafts together to keep them from drifting apart ← correct
Life jackets should be marked with which item?
- The vessel's name ← correct
- The vessel's home port
- The maximum weight allowed
- The stowage space assigned
Which is TRUE concerning the stowage of life jackets?
- They must be stowed in readily accessible locations ← correct
- They are required to be stowed in messrooms
- They are required to be stowed in a central location
- They are always locked in watertight containers
If you are required to jump from any height from your vessel when should the external flotation bladder of an immersion suit be inflated?
- After entry into the water ← correct
- Only after four hours in the water
- Only after two hours in the water
- Before entry into the water
Heavy Weather Operations
3 questions · 6% of the paper
Which term defines when a boat turns broadside to heavy seas and winds, thus exposing the boat to the danger of capsizing?
- Trimmed
- Yawed
- Broached ← correct
- Pitchpoled
What is meant by the term "broaching to"?
- Having the vessel head toward the sea
- Having the vessel filled with water
- Running before a sea
- Being turned broadside to the sea ← correct
When making way in heavy seas you notice that your vessel's screw is being lifted clear of the water and racing. Which action will correct the situation?
- Decrease the vessel's speed ← correct
- Shift more weight forward
- Increase the vessel's speed
- Shift the rudder back and forth several times
Watchkeeping
3 questions · 6% of the paper
You are on watch at anchor awaiting berthing orders. Which statement is TRUE?
- The holding power of the anchor should be recorded once per watch
- While at anchor, check the vessel's position frequently ← correct
- The pilot came aboard, turn on the running lights and secure the cargo lights
- Be prepared to slack the lines at high water
When is a lookout permitted to leave his station?
- 15 minutes before the end of the watch
- Only when properly relieved ← correct
- At the end of the watch
- At any time
You are a watchstanding mate and have come to the bridge to relieve the watch. After reviewing the chart and having been briefed by the off-going mate, you are now ready to affect the relief. Which of the following is exemplary of the statement that would officially transfer the watch?
- You say to the mate going off watch, "Destination New York, course 283°, speed 16 knots."
- The mate being relieved says, "All in apparent good order, course 068° per gyro, 075° per standard."
- The mate being relieved says, "You now have the watch, course 147°, speed 15 knots."
- You say to the mate going off watch, "I relieve you, course 321° per gyro, 316° per standard." ← correct
Vessel Power Plants and Electrical
3 questions · 6% of the paper
If a gasoline engine turns over freely but will not start, the cause is generally __________.
- a defective ignition system ← correct
- low lube oil level
- too heavy a load
- weak valve springs
The carburetor is placed on the engine to perform which function?
- To distribute the gasoline
- To properly lubricate the engine
- To assist in priming the cylinders
- To mix the fuel and air ← correct
How can the accumulation of dangerous fumes generated by the storage batteries be prevented?
- By natural or mechanical ventilation ← correct
- Covering the batteries in a nonconducting, solid enclosure
- Mounting the batteries in a position as high as possible
- Securing the batteries to vibration reducing mounting brackets
Radiotelephone Communications
3 questions · 6% of the paper
What is maximum power allowed by the FCC for VHF-FM radio transmissions?
- 1 watt
- 5 watts
- 15 watts
- 25 watts ← correct
If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies, which frequency should you call on?
- Calling frequency
- Working frequency ← correct
- Distress frequency
- Urgency frequency
What is the average range of vessel-to-vessel VHF-FM radio communications?
- 15 to 20 miles ← correct
- 60 to 90 miles
- 90 to 120 miles
- 120 to 150 miles
Maritime Law, Certificates and Documents
2 questions · 4% of the paper
Which is the requirement for the name and hailing port of a documented commercial vessel?
- It is required to be marked on the stern with the name of the vessel marked on both bows ← correct
- It is required to be marked on the keel, stern, and both bows
- It is required to be marked on both bows and on the keel
- It is not required to be marked anywhere on the vessel
What is the period of validity of a Merchant Mariner Credential?
- 2 years
- 1 year
- 5 years ← correct
- 3 years
Pollution Prevention and Sanitation
2 questions · 4% of the paper
Which method requires prior approval to be used when cleaning up an oil spill?
- Sorbent booms
- Suction equipment
- Chemical agents ← correct
- Skimmers
The Federal Water Pollution Control Act requires the person in charge of a vessel to immediately notify the Coast Guard as soon as he knows of any oil discharge. Failure to notify the Coast Guard can lead to a monetary fine and imprisonment up to what duration?
- 5 years ← correct
- 3 years
- 2 years
- 1 years
Man Overboard
1 question · 2% of the paper
On a small boat, if someone fell overboard and you did not know over which side the person fell, which action should you take?
- Immediately reverse the engines
- Increase speed to full to get the vessel away from the person
- First put the rudder hard over in either direction
- Stop the propellers from turning and throw a ring buoy over the side ← correct
Emergency Towing
1 question · 2% of the paper
The vessel shown in illustration D025DG has broken down and you are going to take her in tow. The wind is coming from her starboard beam. You are making more leeway than she. Where should you position your vessel when you start running lines?
This question is asked against Coast Guard illustration D025DG, which we cannot reproduce — the examination drawings are adapted from copyrighted works. To work it you need the illustration in front of you.
- A ← correct
- B
- C
- D
Distress and Special Signals
1 question · 2% of the paper
Which visual distress signal is acceptable for daylight use only?
- Hand-held red flare
- Red aerial pyrotechnic flare
- Self-contained rocket-propelled parachute red flare
- Hand-held orange smoke distress flare ← correct
Practice only — this is not a Coast Guard examination and passing it certifies nothing. Questions marked as real examination questions are from the National Maritime Center's current sample examination for Q170; every answer points to the current regulation or Coast Guard publication that settles it.