Aircraft Governor Adjustment Quiz

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What is the function of the body or case in a fuse?

Smooths the ripple to an almost negligible amount
Holds the fuse together and allows easy identification of a blown fuse (correct)
Is the part of the fuse that 'breaks' the circuit
Acts as the electrical connection to the circuit

Why are some ceramic fuses designed for use in combustible environments?

To form the electrical connection to the circuit
To prevent sparking from a blowing fuse, reducing hazards (correct)
To disconnect circuit current once predefined limits are exceeded
To allow easy identification of a blown fuse

What part of the fuse is responsible for 'breaking' the circuit?

Body or case
Fuse link (correct)
Capacitive effect of rectifier diodes
Mounting

Which component of a fuse connects to the mounting and disconnects circuit current when limits are exceeded?

Fuse link (D) Signup and view all the answers

How do the rectifier diodes affect the DC voltage in a circuit?

Smooth the ripple to an almost negligible amount (C) Signup and view all the answers

Which type of mounting forms the electrical connection to the circuit in a fuse?

Lead connection mounting (D) Signup and view all the answers

What is the purpose of the charge pump in the hydraulic circuit?

Supplying filtered oil to various components like cylinder blocks and control piston (B) Signup and view all the answers

How does clockwise rotation of the adjustment screw affect system frequency?

Increases the frequency (D) Signup and view all the answers

What function does the generator scavenge pump serve in the hydraulic circuit?

Picking up generator cooling and lube oil and transferring it to the all-attitude reservoir (B) Signup and view all the answers

What is the effect of a 360-degree turn of the adjustment screw on system frequency?

Changes the frequency by approximately 3–4 Hz (B) Signup and view all the answers

Where is the transmission scavenge pump located in the hydraulic circuit?

Between the transmission sump and the scavenge filter (B) Signup and view all the answers

What role does counter-clockwise rotation of the adjustment screw play in system operation?

Decreases the frequency (A) Signup and view all the answers

What is the purpose of a current limiter in aircraft power distribution systems?

To protect against continuous small overloads (B) Signup and view all the answers

Which materials are commonly used as insulating materials in fuses?

Glass and Bakelite (D) Signup and view all the answers

What happens when the current limit of a fusing link is exceeded?

The fusing link melts or blows (D) Signup and view all the answers

In a cartridge fuse, what are the metal ferrules at each end used for?

To make contact with the fuse holder (C) Signup and view all the answers

What distinguishes a current limiter from a fast-blow fuse?

Longer time to open than a fast-blow fuse (B) Signup and view all the answers

Why should a fuse only be replaced with one of the same voltage and current rating?

To prevent damage from an incorrect replacement (D) Signup and view all the answers

What happens if the ground power cart lead/plug is accidentally wired incorrectly?

The external power relay will not energise (A) Signup and view all the answers

How many large pins are there in the external AC power receptacle for each of the phases (ABC)?

Four large pins (B) Signup and view all the answers

What is the purpose of the two smaller pins in the external AC power receptacle?

To provide interlock sensing (B) Signup and view all the answers

If the external power plug is disconnected from the aircraft while 'live,' what happens first?

Shorter pins disconnect first (C) Signup and view all the answers

What is the role of the reverse polarity diode in the external DC power circuit?

To stop incorrect polarity power being supplied (A) Signup and view all the answers

Why does de-energising the external power relay happen before disconnecting main pins from the aircraft?

To prevent arcing at the pins (C) Signup and view all the answers

What happens when the voltage output is at a regulated value in the relay?

The contacts actuated by the voltage coil connect the generator switch and contactor coil to ground. (D) Signup and view all the answers

What is the purpose of the reverse current condition in the relay during engine shut-down?

To open the pilot contacts and de-energize the contactor coil. (C) Signup and view all the answers

How does the current coil assist in keeping the pilot contacts closed in the relay?

By opposing the effect of the voltage coil when sufficient current flows through it. (B) Signup and view all the answers

What is the function of reverse current circuit breakers as described in the text?

To protect power supply systems against fault currents greater than cut-out limits. (A) Signup and view all the answers

Why are reverse current circuit breakers designed to remain in a 'locked-out' condition?

To ensure complete isolation of a circuit until a fault is cleared. (C) Signup and view all the answers

How do reverse current circuit breakers differ from normal cut-outs in their operation?

They are designed to protect against fault currents greater than those at which cut-outs normally operate. (C) Signup and view all the answers