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Questions and Answers
What type of generators are used as the principal source of electric power in almost all transport-category aircraft?
What type of generators are used as the principal source of electric power in almost all transport-category aircraft?
- DC alternators
- Transformer Rectifier Units (TRUs)
- AC generators (correct)
- Main battery chargers
What is used to produce a DC output in a DC alternator?
What is used to produce a DC output in a DC alternator?
- Transformer Rectifier Units (TRUs)
- Internal rectifiers (correct)
- AC voltage
- Main battery chargers
Why are AC generators requiring a constant-speed drive considered too heavy for light aircraft?
Why are AC generators requiring a constant-speed drive considered too heavy for light aircraft?
- They are too heavy (correct)
- They are too large in size
- They are less reliable
- They produce lower power output
In larger aircraft, what is used to change the engine-driven AC-generated 115-V AC to 28-V DC?
In larger aircraft, what is used to change the engine-driven AC-generated 115-V AC to 28-V DC?
What serves as the backup DC source if other sources do not operate in an aircraft?
What serves as the backup DC source if other sources do not operate in an aircraft?
What is the main difference between the electrical system of light aircraft and that of larger aircraft?
What is the main difference between the electrical system of light aircraft and that of larger aircraft?
What is the purpose of a tap in a transformer?
What is the purpose of a tap in a transformer?
Which component is typically used in rectifier circuits to allow current flow in only one direction?
Which component is typically used in rectifier circuits to allow current flow in only one direction?
What is the primary function of a Transformer Rectifier Unit (TRU)?
What is the primary function of a Transformer Rectifier Unit (TRU)?
In a rectifier circuit, what is the purpose of converting AC to DC?
In a rectifier circuit, what is the purpose of converting AC to DC?
What is one of the reasons for having multiple secondaries or tappings in a transformer?
What is one of the reasons for having multiple secondaries or tappings in a transformer?
How does a tap in a transformer affect the voltage output?
How does a tap in a transformer affect the voltage output?
What is the purpose of a Constant Speed Drive (CSD) in an aircraft electrical power system?
What is the purpose of a Constant Speed Drive (CSD) in an aircraft electrical power system?
Which type of generators are typically used in most aircraft applications?
Which type of generators are typically used in most aircraft applications?
What type of AC power do the generators supply in a turbine-powered aircraft?
What type of AC power do the generators supply in a turbine-powered aircraft?
In emergency situations, which devices are often used to drive AC generators on aircraft?
In emergency situations, which devices are often used to drive AC generators on aircraft?
What is a common feature of most AC power systems compared to DC systems in aircraft?
What is a common feature of most AC power systems compared to DC systems in aircraft?
What technology is commonly integrated into one unit in modern aircraft instead of using separate Constant Speed Drives and generators?
What technology is commonly integrated into one unit in modern aircraft instead of using separate Constant Speed Drives and generators?
What is the role of the current coil in the relay described in the text?
What is the role of the current coil in the relay described in the text?
How does the relay ensure the generator is disconnected from the battery during engine shut-down?
How does the relay ensure the generator is disconnected from the battery during engine shut-down?
Why are reverse current circuit breakers designed to remain in a 'locked-out' condition?
Why are reverse current circuit breakers designed to remain in a 'locked-out' condition?
What happens when a fault current greater than normal occurs in a power supply system protected by reverse current circuit breakers?
What happens when a fault current greater than normal occurs in a power supply system protected by reverse current circuit breakers?
How does the relay prevent generator overloading in the system described?
How does the relay prevent generator overloading in the system described?
What is the consequence of the magnetic effect of the current coil opposing that of the voltage coil during engine shut-down?
What is the consequence of the magnetic effect of the current coil opposing that of the voltage coil during engine shut-down?
What is the primary reason for circuit breakers and fuses to be located close to the power supply?
What is the primary reason for circuit breakers and fuses to be located close to the power supply?
What does a small white band on a circuit breaker indicate?
What does a small white band on a circuit breaker indicate?
What is a trip-free circuit breaker designed to do?
What is a trip-free circuit breaker designed to do?
When is a non-trip-free circuit breaker used?
When is a non-trip-free circuit breaker used?
Which type of circuit breaker can be bypassed by holding the operating mechanism on?
Which type of circuit breaker can be bypassed by holding the operating mechanism on?
Where are trip-free circuit breakers typically used?
Where are trip-free circuit breakers typically used?
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