ATPL Aircraft General Knowledge Practice Questions - Sri Lanka CAA ATPL(A) Aircraft General Knowledge Examination Exam - ATPL Aircraft General Knowledge Practice Questions - Sri Lanka CAA ATPL(A) Aircraft General Knowledge Examination Exam

Question 1

In a modern multi-engine transport category aircraft, how is the output voltage of a brushless AC generator controlled under varying electrical loads?

By varying the excitation current fed into the exciter stator By adjusting the mechanical speed of the generator rotor via the Constant Speed Drive (CSD) By inserting variable resistors in series with the main stator output windings By switching the number of active poles on the main stator winding

Correct Answer:

By varying the excitation current fed into the exciter stator

Question 2

An AC generator rated at 115/200 V, 3-phase, 400 Hz is driven by a Constant Speed Drive (CSD). If the engine speed increases from idle to takeoff thrust, what changes occur in the CSD and generator outputs?

The CSD output speed increases, increasing both the frequency and the output voltage of the generator The CSD adjusts its internal hydraulic ratio to keep generator speed and frequency constant at 400 Hz, while the voltage regulator keeps voltage constant The generator output frequency increases linearly with engine RPM, but the voltage is regulated to 115 V by the GCU The CSD disconnects the generator at high engine RPMs to prevent overfrequency and overvoltage conditions

Correct Answer:

The CSD adjusts its internal hydraulic ratio to keep generator speed and frequency constant at 400 Hz, while the voltage regulator keeps voltage constant

Question 3

A 6-pole brushless AC generator is installed on an auxiliary power unit (APU). To maintain a constant output frequency of 400 Hz, what must be the rotational speed of the generator rotor?

12,000 RPM 8,000 RPM 6,000 RPM 24,000 RPM

Correct Answer:

8,000 RPM

Question 4

What is the primary danger associated with overcharging a Nickel-Cadmium (Ni-Cd) aircraft battery, and how is it characterized?

Thermal runaway, characterized by a rapid drop in internal resistance and an exponential rise in cell temperature and charging current Sulfation, characterized by the accumulation of lead sulfate crystals on the cell plates, causing capacity loss Electrolyte stratification, where acid separates from water and concentrates at the bottom of the battery container Memory effect, which causes the battery to instantly discharge when it reaches a specific state of charge

Correct Answer:

Thermal runaway, characterized by a rapid drop in internal resistance and an exponential rise in cell temperature and charging current

Question 5

What is the primary function of a Transformer Rectifier Unit (TRU) in an aircraft electrical system?

To convert 28 V DC power to 115 V AC power To step down 115 V AC power and convert it to 28 V DC power To convert variable frequency AC power to constant frequency AC power To step up 28 V DC power to 115 V DC power

Correct Answer:

To step down 115 V AC power and convert it to 28 V DC power

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Prepare with the ATPL Aircraft General Knowledge Practice Questions - Sri Lanka CAA ATPL(A) Aircraft General Knowledge Examination Exam practice quiz. This question bank includes 100 questions covering aircraft, primary, transport, generator, and electrical. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ATPL Aircraft General Knowledge Practice Questions - Sri Lanka CAA ATPL(A) Aircraft General Knowledge Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on aircraft, primary, transport, generator, and electrical. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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ATPL Aircraft General Knowledge Practice Questions - Sri Lanka CAA ATPL(A) Aircraft General Knowledge Examination Exam

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