05. DC Sources of Electricity.- Parte 66

A 20 cell battery with each cell having an internal resistance of 0.1 ohms is charged with 2 leads having a total resistance of 0.1 ohms. The battery is charged with a current of 5 amps. What is the charging voltage ?. 0.5 volts. 10.5 volts. 0.005 volts.

Two 10V, 20 Ah batteries are connected in parallel and connected across a 10 ohm load. How long could they supply normal current before the voltage begins to decay?. 40 hours. 20 hours. 4 hours.

A battery rated at 40 Ah will supply 200 mA for. 200 hours. 20 hours. 5 hours.

A zinc-carbon battery life depends upon. the amount of zinc. the purity of the carbon rod. the amount of the electrolyte paste.

When checking the SG of the electrolyte in a lead acid battery, you should. check any cell because they will all be the same. check any cell because they will all be the same. Option B. check only the no. 1 cell because it is the master cell. Option C. check all cells because they may be different. check all cells because they may be different.

The PD at the terminals of an open circuit battery with a small internal resistance will be. more than the EMF. less than the EMF. the same as the EMF.

An accumulation of hydrogen on the plates of a battery is known as. polarization. ionization. hydration.

What part of a battery is covered in hydrogen during polarization?. Anode. Both the anode and the cathode. Cathode.

Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery?. A high internal resistance condition. High current charging of the battery to more than 100 percent of its capacity. Excessive current draw from the battery.

The method of ascertaining the voltage of a standard aircraft lead-acid battery is by checking. the voltage with rated load switched ON. the voltage on open circuit. the voltage off load.

Two batteries 12V and 40 Ah each, are in series. What is the total capacity?. 12V 80 Ah. 24V 40 Ah. 24V 80Ah.

If a battery has got low internal resistance, then the. no load voltage will be the same as on load voltage. on load voltage will be greater than no load voltage. no load voltage will be greater than on load voltage.

Conventional current flow inside a battery is from. either anode to cathode or cathode to anode, depending on the active elements. cathode to anode. anode to cathode.

In a voltaic cell, what is the build-up on the cathode called?. Hydration. Polarization. Sulphation.

Two 12V 40 amp hour batteries connected in parallel will produce. 24V 80 ah. 12V 80 ah. 24V 40 ah.

A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?. 12 volts. 24 volts. 3 volts.

The method of ascertaining the voltage of a standard aircraft lead-acid battery is by checking. the voltage on open circuit. the voltage off load. the voltage with rated load switched ON.

Two similar 12v batteries connected in parallel will produce. 24v e.m.f. with the same capacity as each battery. 12V e.m.f. with twice the capacity of each battery. 24V e.m.f. with twice the capacity of each battery.

The voltage of a secondary cell is. determined by the active materials on the plates. determined by the number of plates. determined by the area of the plates.

What is the ampere-hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours?. 112.5 ampere-hour. 90.0 ampere-hour. 45.0 ampere-hour.

If a nicad battery is not to be used immediately it should be stored. dry. fully charged. fully dissipated.

In a mercury cell the steel casing is. the negative terminal. neither. the positive terminal.

To improve the life of a dry cell it would be manufactured with. more electrolyte paste. more zinc. a pure carbon positive rod.

In a simple voltaic cell the collection of ions on the cathode causes. polarisation. sulphation. hydration.

The electrolyte in a nicad battery would rise if the battery was. remaining at constant voltage. discharging. charging.

Two 2 volt 10AH cells are connected in series, the output voltage and the capacity would be. 4 volt 10 AH. 4 volt 20 AH. 2 volt, 20 AH.

The electrolyte in a nicad battery is. potassium hydroxide. nickel hydroxide. cadmium hydroxide.

In a Leclanche cell the plates are made of. mercury and lithium. nickel and cadmium. zinc and carbon.

In a simple voltaic cell, polarization reduces output voltage because of the. build up of hydrogen on the cathode. transfer of material between the anode and the cathode. build up of hydrogen on the anode.

When the temperature of the electrolyte in a battery increases, the SG. remains the same. goes up. goes down.

The Daniel Cell electrodes are. copper and zinc. carbon and zinc. zinc and manganese dioxide.

In a thermocouple, where is voltage measured?. At both junctions. At the hot junction. At the cold junction.

Mercury cells are covered with a metal cover. as a protective cover. as a negative terminal. as a positive terminal.

The capacity of a battery is measured in. volts. ampere-hours. cubic centimetres.

A battery's internal resistance is determined by (OCV = Open Circuit Voltage, CCV = Closed Circuit Voltage). IR = (OCV – CCV)/ i. IR = (OCV + CCV) / i. IR = (OCV - CCV) / V.

There are more negative than positive plates in a lead acid battery because. it is necessary for chemical action to take place. it reduces the internal resistance of the cell. the positive plates are prone to warping if the chemical action is taking place only on one side.

What is the approximate internal resistance of a Leclanche cell?. 0.02 ohms - 4 ohms. 6 ohms - 10 ohms. 20 ohms - 30 ohms.

An aircraft battery on charge from the aircraft generators causes. battery voltage to increases to nominal voltage and the charge current decreases. internal resistance of the battery to decrease in sympathy with the decreasing charging current. battery voltage to decrease to zero until it is fully charged.

What effect does hydrogen have in a battery cell?. Sulphation. Nothing. Polarization.

To generate electricity with a fuel cell, you need a constant supply of. Nitrogen & Sunlight. Oxygen & Hydrogen. Kerosene & Heat.

A ni-cad battery found to be below normal capacity should. have its electrolyte adjusted. be removed and used for ground use only. be re-charged with a freshening charge.

In cold weather, to prevent the electrolyte freezing, a battery must be kept. fully charged. does not matter. fully discharged.

The internal resistance of a battery off load compared to on load is. the same. increased. decreased.

Two 12V, 40Ah cells in series gives. 24V 80Ah. 12V 40Ah. 24V 40Ah.

A 24V 40AH battery discharges at 200mA. How long will it last?. 400 hours. 300 hours. 200 hours.

The electrolyte level of a ni-cad battery. falls during charge. falls during discharge. rises during discharge.

When light energises a component, what is the component?. Light emitting diode. Photodiode. Laser diode.

Formation of white crystals of potassium carbonate on a properly serviced Ni-cd battery indicates. over charged. full charged. under charged.

Thermal runaway causes. violent gassing only. violent gassing, boiling of electrolyte and melting of plates and casing. no gassing, but boiling of electrolyte and melting of plates and casing.

A primary cell. can not recharged. can be recharged but only a few times. can be recharged.

If the insulation resistance of a lead/acid battery is down, it indicates. case leakage. leakage between positive and negative terminals. intercell leakage.

When the battery is connected to the aircraft, which terminal should you connect first?. Any. Positive. Negative.

An ammeter in a battery charging system is for the purpose of indicating the. rate of current used to charge the battery. amperage available for use. total amperes being used in the aeroplane.

For how many hours will a 140AH battery deliver 15A?. 9.33 hours. 27.25 hours. 15.15 hours.

What part of a nickel-cadmium cell helps to prevent thermal runaway?. The separator. The negative plate. The positive plate.

When charging current is applied to a nickel-cadmium battery, the cells emit gas only. when the electrolyte level is low. if the cells are defective. toward the end of the charging cycle.

What is the internal resistance of a battery?. The resistance measured across the two terminals. The resistance measured when the battery is half charged. The resistance present inside the battery while connected to a load.