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18 Cards in this Set
- Front
- Back
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3-60I1
When a lead-acid storage battery is being charged, a harmful effect to humans is: |
Emission of hydrogen gas
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3-60I2
A battery with a terminal voltage of 12.5 volts is to be trickle-charged at a 0.5 A rate. What resistance should be connected in series with the battery to charge it from a 110-V DC line? |
195 ohms
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3-60I3
What capacity in amperes does a storage battery need to be in order to operate a 50 watt transmitter for 6 hours? Assume a continuous transmitter load of 70% of the key-locked demand of 40 A, and an emergency light load of 1.5 A. |
177 ampere-hours
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3-60I4
What is the total voltage when 12 Nickel-Cadmium batteries are connected in series? |
15 volts
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3-60I5
The average fully-charged voltage of a lead-acid storage cell is: |
2.06 volts
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3-60I6
A nickel-cadmium cell has an operating voltage of about: |
1.25 volts
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3-61I1
When an emergency transmitter uses 325 watts and a receiver uses 50 watts, how many hours can a 12.6 volt, 55 ampere-hour battery supply full power to both units? |
1.8 hours
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3-61I2
What current will flow in a 6 volt storage battery with an internal resistance of 0.01 ohms, when a 3-watt, 6-volt lamp is connected? |
0.4995 amps
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3-61I3
A ship RADAR unit uses 315 watts and a radio uses 50 watts. If the equipment is connected to a 50 ampere-hour battery rated at 12.6 volts, how long will the battery last? |
1 hour 43 minutes
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3-61I4
If a marine radiotelephone receiver uses 75 watts of power and a transmitter uses 325 watts, how long can they both operate before discharging a 50 ampere-hour 12 volt battery? |
1 1/2 hours
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3-61I5
A 6 volt battery with 1.2 ohms internal resistance is connected across two light bulbs in parallel whose resistance is 12 ohms each. What is the current flow? |
0.83 amps
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3-61I6
A 12.6 volt, 8 ampere-hour battery is supplying power to a receiver that uses 50 watts and a RADAR system that uses 300 watts. How long will the battery last? |
17 minutes or 0.3 hours
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3-62I1
What occurs if the load is removed from an operating series DC motor? |
It will accelerate until it falls apart
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3-62I2
If a shunt motor running with a load has its shunt field opened, how would this affect the speed of the motor? |
It will speed up
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3-62I3
The expression “voltage regulation” as it applies to a shunt-wound DC generator operating at a constant frequency refers to: |
Voltage fluctuations from load to no-load
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3-62I4
What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient? |
57.2 amps
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3-62I5
A 3 horsepower, 100 V DC motor is 85% efficient when developing its rated output. What is the current? |
26.300 amps
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3-62I6
The output of a separately-excited AC generator running at a constant speed can be controlled by: |
The amount of field current
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