Description : The freezing point of the electrolyte in a fully charged lead-acid battery will be _____________. A. higher than in a discharged battery B. lower than in a discharged battery C. the same as in a discharged battery D. higher than in a discharged battery, but the specific gravity will be less
Last Answer : Answer: B
Description : Which of the listed battery charging circuits is used to maintain a wet-cell, lead-acid, storage battery in a fully charged state during long periods of disuse? A. Normal charging circuit B. Quick charging circuit C. Trickle charging circuit D. High ampere charging circuit
Last Answer : Answer: C
Description : A lead-acid battery is considered fully charged when the ______________. A. electrolyte gasses freely B. battery charger ammeter indicates a positive reading C. terminal voltage reaches a constant value at a ... cells reaches the correct value and no longer increases over a period of 1 to 4 hours
Last Answer : Answer: D
Description : A lead-acid battery cell sustaining a short circuit _______. A. will be indicated by lime accumulation on the terminal posts B. will have unusually high cell voltage C. will become excessively heated while being charged D. cannot be completely discharged under load
Description : Capacitance in an AC circuit will _____________. A. stop current flow once the capacitor is fully charged B. allow current flow in only one direction C. oppose any change in circuit voltage D. rectify the current
Description : In accordance with Coast Guard Regulations (46 CFR), each battery operated relay-controlled lantern must _____________. A. be readily portable B. contain a dry cell battery having a minimum capacity of ... automatic battery charger to maintain the battery in a fully charged state D. all of the above
Description : Which of the listed ranges represents specific gravity corrected for temperature for the electrolyte of a fully charged portable lead-acid battery? A. 1.100 to 1.150 B. 1.180 to 1.200 C. 1.280 to 1.300 D. 1.750 to 2.000
Description : Define specific gravity and mention the specific gravity of a fully charged lead acid battery?
Last Answer : Specific gravity of a substance is the comparison of density of the substance with the density of pure water. Specific gravity = Density of the substance / density of pure water. ... - 27°C)*0.0007. Indicated specific gravity = 1.205 and t' means electrolyte temperature.
Description : When troubleshooting a lead-acid storage battery, a weak or dead cell is best detected by _________________. A. measuring and comparing all cells' specific gravity B. taking an open circuit ... electrolyte levels of each cell D. taking each cell's temperature with a calibrated mercury thermometer
Last Answer : Answer: A
Description : Violent gassing from a lead-acid battery while it is being charged, indicates that the _____________. A. plate separators are grounded B. battery compartment ventilation is inadequate C. electrolyte specific gravity is too low D. charging rate is too high
Description : In the illustrated circuit the voltage is 12 VDC and the resistance is 3 ohms. If the battery is rated for 120 amp-hours, how long before the voltage will drop to 1.75 volts per cell? EL-0018 A. 12 hours B. 1.75 days C. 30 hours D. 2.5 days
Description : When charging a 100 amp-hour lead-acid battery, ___________. A. the temperature of the electrolyte should not be allowed to exceed 90°F B. the charging rate should be no greater than 125% of the ... nearing full charge and it will be necessary to reduce the charging current to a low finishing rate
Description : An open shunt field in a direct current machine may be located by connecting the field circuit to an external power source, equal to the rated field voltage or less, and tested with a voltmeter from ... C. any suitable ground to any available line lead D. any field pole to each field coil lead
Description : When you check the specific gravity of the battery electrolyte with a hydrometer, it should be kept in mind that ____________. A. the battery is fully charged when the indicator floats low in ... taken immediately after water is added to the cell D. temperature has no effect on hydrometer readings
Description : When checking the specific gravity of the battery electrolyte with a hydrometer, you should be aware that ________________. A. the battery is fully charged when the float sinks deepest into the ... is added to the cell D. warm temperatures will lower the specific gravity of the electrolyte
Description : In the illustrated circuit, what is the voltage of the battery if the resistance of R1 is 150 ohms, the total resistance is 250 ohms and the current though R2 is 25 milliamps? EL-0036 A. 12 volts B. 24 volts C. 1.5 volts D. 6.25 volts
Description : In the illustrated circuit, what is the voltage measured across R1 if the battery is 24 volts, the resistance of R1 is 34 ohms, and the resistance of R2 is 126 ohms? EL-0036 A. 24 volts B. 18.9 volts C. 5.1 volts D. 150 millivolts
Description : What is the calculated voltage at the positive and negative terminals of the battery shown in the illustration if each cell has a voltage of 1.5 volts? EL-0034 A. 1.5 volts B. 3.0 volts C. 6.0 volts D. 12.0 volts
Description : A battery is connected to a circuit containing three resistors in parallel. The values of the three resistors are 2 ohms, 3 ohms, and 6 ohms. What is the voltage of the battery if the total circuit current is 12 amps? A. 2 volts B. 6 volts C. 12 volts D. 24 volt
Description : What is the approximate voltage per cell produced by the nickel-iron (Edison) battery? A. 0.85 volts B. 1.35 volts C. 2.20 volts D. 6.05 volts
Description : In the illustration, A, B, C, and D are 12 volts in the circuit. What is the voltage of the lead connected to C and D with respect to the lead connected to A and B? EL-0039 A. (-) 48 volts B. (+) 48 volts C. (-) 24 volts D. (+) 24 volts
Description : In the illustration circuit, A, B, C, and D are each 12 volts. What is the voltage of the lead connected to C and D with respect to the lead connected to A and B? EL-0039 A. (+) 48 volts B. (-) 24 volts C. (-) 48 volts D. (+) 24 volts
Description : In the illustration circuit, A, B, C, and D are each 12 volts. What is the voltage at the output lead connected to 'A' and 'B' with respect to the output lead connected to 'C' and 'D'? EL-0039 A. (+) 48 volts B. (-) 24 volts C. (-) 48 volts D. (+) 24 volts
Description : The state of charge of a lead acid storage battery is best indicated by the _____________. A. testing of the individual cell voltages B. ampere hour capacity of the battery C. specific gravity of the electrolyte D. total cell voltages
Description : If the illustrated device is fully discharged, what will be the result? EL-0061 A. The battery will be short circuited because the mud space will be filled with lead sulfate B. The electrolyte ... minimum sulfuric acid. D. The plates will be maximum lead oxide and sponge lead minimum lead sulfate.
Description : What is the approximate voltage produced by a nickel-cadmium battery cell? A. 1.25 volts B. 1.50 volts C. 2.20 volts D. 6.05 volts
Description : When a battery is continuously exposed to low temperatures, the best procedure to keep it from freezing is to _________. A. remove the battery caps B. securely cover the battery C. keep the battery fully charged D. disconnect the battery
Description : Which of the following procedures represents the best method to prevent the freezing of batteries continuously exposed to low temperatures? A. The battery caps should be removed. B. The battery cap ... in a fully charged condition. D. The battery should be disconnected from its charging source.
Description : What factors that decide the VRLA battery to completely charged from fully discharged condition?
Last Answer : Answer: Some of the important factors that determine the duration of the discharged battery to charge are: Duration of the discharge occurred Temperature at which battery is operating Size and efficiency of the charger
Description : Battery capacities are given in _____________. A. volts B. volt-amperes C. volt-hours D. ampere-hours
Description : Which of the following conditions indicates that a lead-acid battery is being charged too rapidly? A. Sparks occurring at the positive terminal. B. Unusually high electrolyte specific gravity. C. Low plate potentials being developed. D. Excessively high temperatures and gassing rates.
Description : What is the voltage across 'R3' of the illustrated circuit if the supply is 24 volts and the resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms? EL-0020 A. 2 volts B. 6 volts C. 8 volts D. 10 volts
Description : What is the voltage across 'R2' of the illustrated circuit if the supply is 24 volts and the resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms? EL-0020 A. 2 volts B. 6 volts C. 8 volts D. 10 volts
Description : What is the voltage across 'R1' of the illustrated circuit if the supply is 24 volts and resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms? EL-0020 A. 2 volts B. 6 volts C. 8 volts D. 10 volts
Description : Under which of the following conditions will a lead-acid battery be given a 'test discharge'? A. To determine its capacity. B. Whenever a cell cannot be brought within 10 points of full charge ... cells is found to have less than normal voltage after an equalizing charge. D. All of the above.
Description : The state of charge of a lead-acid battery is best indicated by the ____________. A. individual cell voltage B. ampere-hour capacity C. electrolyte specific gravity D. total cell voltage
Description : A lead-acid battery may become hotter than normal during a charge if the _________. A. battery has a shorted cell B. charging voltage is too low C. specific gravity is too high D. battery room door is secured
Description : A compound generator has a no-load voltage of 250 volts and a full-load voltage of 230 volts, and therefore, is considered to be _____________. A. flat compounded B. over compounded C. under compounded D. terminal compounded
Description : If violent gassing occurs when a lead-acid storage battery is first placed on charge, the _____________. A. battery must be given an emergency charge B. charging rate is too low C. charging rate is too high D. specific gravity of the electrolyte solution is too low
Description : When the electrolyte level of a lead-acid storage battery has decreased due to normal evaporation, the level should be reestablished by adding _____________. A. distilled water only B. sulfuric acid ... of sulfuric acid and distilled water D. a strong solution of sulfuric acid and distilled water
Description : The charge of a lead-acid battery is checked with a _____________. A. manometer B. hydrometer C. viscosimeter D. ohmmeter
Description : When a lead-acid battery begins gassing freely while receiving a normal charge, the charging current should _____________. A. be increased B. remain unchanged C. be decreased D. shut off
Description : The specific gravity of the electrolyte solution in a lead acid battery _____________. A. is not effected during charging B. remains the same during discharge C. would read close to 1.830 when discharged D. gives an indication of the state of charge of the battery
Description : The specific gravity of the electrolyte in a lead-acid battery is measured by a _____________. A. gould plate B. titration pipette C. hydrometer D. litmus paper test
Description : When a lead-acid battery begins gassing freely while receiving a normal charge, the charging current should be _____________. A. increased B. shut off C. decreased D. unchanged
Description : The electrolyte in a lead-acid storage battery consists of distilled water and _____________. A. hydrogen chloride B. calcium chloride C. sulfuric acid D. muriatic acid
Description : In the illustration, A, B, C and D are 12 volt batteries. a voltmeter across the output of the circuit will indicate _____________. EL-0039 A. 6 volts B. 12 volts C. 24 volts D. 48 volts
Description : Peripheral components for the operation of the astern valve position amplifier circuit shown in the illustration are _____________. EL-0099 A. resistors B. operated on +28 volts D.C. C. located on a separate circuit card D. all of the above
Description : At high discharge rates, nickel-cadmium storage batteries are superior to lead-acid batteries because they __________. A. require fewer cells for the same voltage and less mounting space B. are able to ... times without much damage D. have no individual cells to replace at the end of useful life
Description : A common-emitter circuit has an input voltage of 0.1 volt, an output voltage of 2.0 volts, an input current of 0.5 milliamps, and an output current of 10 milliamps. What is the power gain? A. 20 B. 40 C. 400 D. 4000