Standard Book, Technical General
DC Electrics - Batteries: DGCA Technical General questions
The battery starts the engines and gives an emergency supply if the generators fail. Two types matter: the lead acid cell, with sulphuric acid electrolyte, and the alkaline nickel cadmium cell, with potassium hydroxide.
Most of the 30 questions deal with cell voltage, specific gravity, capacity in ampere hours and batteries joined together. Exam sessions have used 1 of these battery questions.
In series, voltages add and capacity stays that of one battery; in parallel, voltage stays the same and capacities add. A lead acid cell is nominally 2 volts and an alkaline cell 1.2 volts. Specific gravity shows a lead acid cell's charge, but in an alkaline cell it barely changes and tells you little.
0 answered·5 free questions·0 right
Question 1 of 5
Battery voltage is tested with:
Question 2 of 5
Two 12 V 40 Ah batteries connected in series will produce:
Question 3 of 5
Two 12 V 40 Ah batteries connected in parallel will produce:
Question 4 of 5
A battery capacity test is carried out:
Question 5 of 5
An aircraft has three batteries each of 12 volts with 40 Ah capacity connected in series. The resultant unit has:
25 more questions in this chapter
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