30 Questions
What is the function of the thermal circuit breaker in normal operation?
Radiate heat to the load
What triggers the thermal circuit breaker to 'trip' in case of current exceeding its rating?
Temperature of the thermal element increases
What is a disadvantage of a rotary inverter compared to a static inverter?
Lack of frequency control
Which part of the thermal circuit breaker directly opens the main switch contacts when tripped?
Bimetallic thermal element
What must be done to reset a tripped thermal circuit breaker?
Manually reset the circuit breaker
Which component of a rotary inverter typically leads to more scheduled maintenance than static inverters?
Brushes and commutator
What is responsible for releasing the latch mechanism of the thermal circuit breaker when tripped?
Bimetallic thermal element distortion
What voltage range does the static inverter mentioned in the text use as input?
18 to 30-V DC
What happens when the load is removed from a rotary inverter?
It shuts down
Why is it important for circuit breakers to clearly display their current rating?
To show the maximum current they can handle
What type of generators are used as the principal source of electric power in almost all transport-category aircraft?
AC generators
Why should the control box on top of a rotary inverter not be disassembled in the field?
To avoid damaging the inverter
What is a characteristic of the output of the static inverter mentioned in the text?
115 V, single-phase AC
Why are AC generators preferred over DC generators in transport-category aircraft?
They are lighter in weight.
What is the purpose of Transformer Rectifier Units (TRUs) on larger aircraft?
To convert AC to DC power
Why are DC alternators used in modern light aircraft?
To produce DC output from AC voltage
Which part of the aircraft serves as the backup DC source if other sources do not operate?
Aircraft main battery
What type of drive is an AC generator on light aircraft NOT suitable for due to weight constraints?
'constant-speed' drive
What is the purpose of the reverse current cut-out relay in the generator circuit?
To disconnect the battery from the generator when the generator voltage is less than the battery voltage
What happens if the reverse current cut-out relay is not used in the generator circuit?
The battery could discharge through the generator, driving the generator as a motor
How does reducing the output voltage affect the generator current?
Reduces it
What initiates the rise in generator voltage and current in the described system?
Demagnetization of L3 core and closing of contact points
What is the role of the voltage regulator in the system?
Actuated by line voltage
Why is a certain minimum value of load current necessary in this system?
To cause the current limiter to vibrate
What happens when the output voltage rises above a specified critical value in a vibrating-type voltage regulator?
The field rheostat is removed from the circuit.
How does a vibrating-type voltage regulator maintain an average voltage with load changes?
By opening and closing contact B several times per second.
What is the role of the solenoid in a vibrating-type voltage regulator?
To connect and disconnect the field rheostat from the circuit.
Why does contact B open when the output voltage exceeds a critical value?
To reduce field current and lower output voltage.
What purpose does the dashpot serve in a vibrating-type voltage regulator?
It prevents hunting by acting as a dampener.
How does capacitor C contribute to the functioning of a vibrating-type voltage regulator?
By reducing output voltage fluctuations.
Test your knowledge on the DC power generation systems used in modern light aircraft. Learn about the use of DC alternators to produce electric power and their advantages over AC generators in aviation.
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