BATTERIES Flashcards
(12 cards)
A battery is made up of a number of ……………
A battery is made up of a number of cells which convert chemical energy into electrical energy
by a transfer of electrons from one material to another causing a potential difference between
them. During the transfer of electrons the chemical composition of the two materials changes.
A Capacity Test, a test to determine the actual capacity of aircraft batteries, is carried out every
….. months and the efficiency must be …… or more for the battery to remain in service.
This capacity will ensure that essential loads can be supplied for a period of ……… minutes
following a generator failure.
A Capacity Test, a test to determine the actual capacity of aircraft batteries, is carried out every
3 months and the efficiency must be 80% or more for the battery to remain in service.
This capacity will ensure that essential loads can be supplied for a period of 30 minutes
following a generator failure.
Battery voltage is tested with:
a. a megometer.
b. a voltmeter on rated load.
c. an ammeter with a rated voltage.
d. a hygrometer
B
Two 12V 40 amp/hour batteries connected in series will produce:
a. 12V 80 amp/hr
b. 12V 20 amp/hr
c. 24V 80 amp/hr
d. 24V 40 amp/hr
D
Two 12V 40 amp/hour batteries connected in parallel will produce:
a. 12V 80 amp/hr
b. 24V 80 amp/hr
c. 12V 20 amp/hr
d. 24V 40 amp/hr
A
A battery capacity test is carried out:
a. 6 monthly
b. 2 monthly
c. 3 monthly
d. every minor check
C
An aircraft has three batteries each of 12 volts with 40 amp/hr capacity connected in series. The
resultant unit has:
a. a voltage of 36 and a capacity of 120 amp/hr.
b. a capacity of 120 amp/hr and a voltage of 12.
c. a capacity of 36 amp/hr and 120 watts.
d. a voltage of 36 and a capacity of 40 amp/hr.
D
An aircraft has a battery with a capacity of 40 amp/hr. Assuming that it will provide its normal
capacity and is discharged at the 10 hour rate:
a. it will pass 40 amps for 10 hrs.
b. it will pass 10 amps for 4 hrs.
c. it will pass 4 amps for 10 hrs.
d. it will pass 40 amps for 1 hr.
C
Battery capacity percentage efficiency must always be:
a. 10% above saturation level
b. above 70%
c. above 80%
d. above 90%
C
The method of ascertaining the voltage of a standard aircraft lead-acid battery is by checking:
a. the voltage on open circuit.
b. the current flow with a rated voltage charge.
c. the voltage off load.
d. the voltage with rated load switched ON.
D
A battery is checked for serviceability by:
a. using an ammeter.
b. measuring the specific gravity of the electrolyte.
c. a boric acid solution.
d. using an ohmmeter.
B
In an AC circuit:
a. the battery is connected in series.
b. a battery cannot be used because the wire is too thick.
c. a battery cannot be used because it is DC.
d. only NICAD batteries can be used.
C
