ABYC Marine Electrical Certification Exam - Questions and Answers

ABYC Marine Electrical Certification Exam - Questions and Answers A customer has a 600 Ah 'house' battery bank and wants to recharge with the highest amperage (standard flooded batteries are being used). How high amperage is reasonable? a. 200 amps b. 150 amps c. 100 amps d. 50 amps While out cruising (away from the dock), batteries on a typical cruiser have what percentage of charge? a. 0 - 100% b. 25 - 75% c. 50 - 100% d. 50 - 85% How much current should flow through the DC grounded conductor in a 15 amp DC lighting circuit? a. 15 amps b. 0 amps c. 10 amps d. None of the above Two technicians are discussing increasing the number of traditional lead-acid golf cart batteries on a customer's vessel from 4 to 8. Both technicians agree that batteries have to be accessible for inspection and maintenance according to the NFPA. Technician A says that the batteries must be in a vented box and secure. Technician B says that boxes are not necessary and a sealed composite tray matching what the boat already has would be fine and looks better. Who is correct? a. Technician A b. Technician B c. Both A & B are correct d. Neither You're installing a 500 GPH bilge pump to be used as a shower pump (just to drain the shower grey-water). It draws 8 amps, is 20' from the distribution panel, and operates at 12 volts. Using the ABYC voltage drop table, what size wire is needed? a. 14 b. 8 c. 10 d. 12 What is the closest distance an unshielded metallic fuel system component can be to a battery terminal? a. 8" b. 12" c. 16" d. 24" When can a flat washer be used on a battery terminal? a. When it has a resistance of less than .01 ohms b. When installed immediately under a wing nut c. When installed in between the base of the battery terminal and the conductor terminal. d. When installed immediately under a split lock washer and nut. When grounding an electrical propulsion system you should always remember too... a. Isolate the grounding system from the main ship grounding system. b. Install a blocking diode between it and your main ground bus. c. Tie your ground into your bonding system. d. Combine it with your main grounding system. Of the following which is NOT a correct way of testing a battery. a. Use a load tester b. Keep track of amps going in and out with an amp hour meter c. Checking voltage drop when engaging starter motor d. Measure open circuit voltage The minimal battery reserve capacity in minutes for a supplied battery power, based on ABYC. A. 30 min B. 90 min C. 120 min D. 200 min A gassing battery gives off: a. sulfuroxide b. nitrous oxide c. nitrogen d. hydrogen A fully charged battery, at rest will have a voltage of: a. 12.2 b. 11.5 c. 12.7 d. 13.2 Some battery manufactures will only consider warranty claims on batteries whose condition has been determined by use of a a. Conductance tester b. Load tester c. Hydrometer d. Megohmmeter When two 6 volt, 220 amp/hour golf cart batteries are connected in series, the resulting output is: a. 6 volt, 440 amp/hr b. 6 volt, 220 amp/hr c. 12 volt, 440 amp/hr d. 12 volt, 220 amp/hr When two 6 volt, 220 amp/hour golf cart batteries are connected in parallel, the resulting output is: a. 6 volt; 220 amp/hr b. 12 volt, 220 amp/hr c. 6 volt, 440 amp/hr d. 12 volt, 440 amp/hr A deep cycle battery is one with an internal design that suits: a. low amperage long term discharge b. high amperage long term discharge c. low amperage short term discharge d. high amperage short term discharge What household item is used to neutralize battery acid? a. WD 40 b. Baking Powder c. Bleach d. Baking Soda The maximum allowable voltage drop permitted for panelboard DC feeders based on ABYC is: A. 2% B. 3% C. 10% D. 12% Which of the following battery has the largest case or physical size of the battery case? a. Group 24 b. Group 4D c. Group 31 d. Cannot determine without knowing the CCA T or F: It is ok to combine different types of batteries as long as they are all of the lead-acid type (i.e. Gell Cell, SLA, AGM, Etc.) False When simultaneously recharging two different types of batteries (house & start) with diode type battery isolator, where is it best to sense the voltage for charging source? a. On the deep-cycle side b. On the cranking battery side c. Sense both together d. Either side, does not matter When troubleshooting a charging problem with a voltage regulator, a technician should find the brown wire: a. To provide AC signal for the tachometer b. To have between 0 and 12 VDC c. To have 12 volts with a keyswitch d. Any of the above will work At what CCA do you have a disconnect switch? a. 1-450 CCA battery b. 1-650 CCA battery c. 2-450 CCA batteries in parallel d. 2-450 CCA batteries in series A fully charged 12 volt battery, after a period of rest during which nothing has been put in or taken out, should have a fully charged voltage of: a. 12.0 - 12.2 volts b. 12.2 - 12.4 volts c. 12.4 - 12.6 volts d. 12.6 - 12.8 volts DC grounded conductors on new boats that are also equipped with AC systems should use what color of insulation? a. Light Blue b. Black c. Red d. Yellow When testing a battery, the hydrometer is used to test a. State of charge b. For bad cells c. Specific gravity d. All of the above After installing an alternator, a technician should: a. Check rotation of cooling fan b. Verify the voltage is less than 13 volts when engine is running c. Check that AC ripple is less than 0.5 VAC d. Both a & c are correct When installing a wind generator, the technician must consider all of the following except: a. Safe height above the deck b. Use of blocking diodes c. Voltage regulation d. Wind direction indicator When testing an alternator, the maximum AC ripple reading to ensure minimal RFI interference should be: a. 0.2 V b. 0.4 V c. 1.0 V d. 4 V You have a customer with an 800 Ah 'house' battery bank who wants to recharge with the biggest amount of amperage he can. Standard flooded batteries are being used. a. 50 amps b. 100 amps c. 200 amps d. 400 amps