1. The electrical system on a boat consists of:
a) The ignition
b) The starting circuit
c) The generating circuit and related systems
d) All of the above
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2.The difference between the function of batteries in boats and autos is:
a) only slightly different as long as only batteries with high cranking currents are used on the boat
b) basically the same
c) quite different since in autos the battery simply starts the engine whereas in boats electrical power is supplied to many other circuits as well
d) only slightly different as long as only deep cycle batteries are used on the boat
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3. Sailboats have different battery requirements from power boats because
a) Power boats have larger current drains than sailboats
b) Sailboats may not have batteries capable of starting the diesel engines
c) Sailboats may not be able to be restarted if the engine is not run often enough to maintain battery charge.
d) power boats have batteries which supply low current loads
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4. Battery capacity is measured in:
a) amp/hours usually based on a period of 20 hours
b) volt/amperes
c) kilowatt hours
d)None of the above
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5. When selecting a battery for a boat the important criteria is:
a) cost and physical size
b) the total amps (rate of flow) each item uses when the battery is not being charged
c) the number of hours each item will be operated
d) b) times c)
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6. Which of the following draws the greatest connected current flow in amps (rate of flow)
a) the refrigerator
b) the SSB radio transmitter
c) the navigation lights
d) the ignition electrical circuit
e) the autopilot
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7. A battery should not be discharged below:
a) 90%
b) 75% (particularly cranking batteries)
c) 45% if there are only deep cycle batteries on the boat
d) 2% of full charge
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8. Which of the following loads uses the most amp/hours in a 24 hour period
a) the refrigerator
b) the SSB radio transmitter
c) the bilge pump
d) the fresh water pump
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9. Batteries can be damaged by:
a) draining too much current before recharging.
b) overcharging (the most common cause)
c) allowing the electrolyte to drop below top of plates
d) All of these are common causes of battery damage
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10. Which of the following is correct.
a) In a boat the wire from the positive battery terminal to the starter & distribution panel is coloured red
b) The best check of battery charge is the high discharge tester
c) The specific gravity of the battery is measured with a hydrometer
d) All of the above are true
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11. The two major types of batteries used in marine applications are:
a) normal auto (cranking) and high current capacity batteries
b) normal auto (cranking) and deep cycle batteries
c) neither of the above mentioned battery battery pairs
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12. The isolator switch used for switching between batteries should:
a) be of the "make-before-break" type
b) have three positions Bat #1, Bat #2, Off
c) be of the low current carrying type
d) All of the above.
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13. Some larger boats utilize two alternators which are used to:
a) provide higher amounts of current for the larger batteries
b) different amounts of output current for different battery types
c) provide different output voltages for different battery types
d) none of the above
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14. A fresh water pump rated at 12 volts and 7.0amperes is located 16'( cablelength) from the battery & is connected with 16 gauge wire.What is the resistance of the connecting wires, the voltage drop & the percentage voltage drop at the motor:
a) 2 * 0.4 = 0.8 ohms and 0.8 * 7.0 = 5.6 volts therefore 5.6/12 * 100 = 46.67 %
b) 16/100 * 0.4 = 0.064 ohms and 0.064* 7 = 0.448 volts therefore 0.448/12 * 100 = 3.73%
c) (16*2)/100 * 0.4 = 0.128 ohms and (0.128 * 7.0) =0.896 volts therefore 0.896/12 * 100 = 7.47%
d) none of the above
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