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Question 135: The auxiliary power unit (APU) has its own AC generator that: A supplies the aircraft with three-phase 115-200 V, 400 Hz AC. B is excited by its generator control unit (GCU) as soon as the APU starts up. C must have the same characteristics as the main AC generator so that it can be easily coupled with the latter. D is driven at constant speed through a constant speed drive (CSD), in the same way as the main AC generator. Explanation: NO Question 136: The colour of a fresh synthetic hydraulic fluids is: A purple. B blue. C red. D pink. Explanation: NO Question 137: A magnetic circuit-breaker is: A a protection system that has a quick tripping response. B is a system with a slow response time. C can be reset without any danger even when fault remains. D permits an overcurrent limited in time. Explanation: NO Question 138: A tubeless tyre is a tyre: 1. which requires solid or branched wheels 2. whose valve can be sheared in sudden accelerations 3. whose mounting rim must be flawless 4. which requires no rim protection between rim flange and tire removing device 5. which does not burst in the event of a tire puncture 6. which eliminates internal friction between the tube and the tire The combination regrouping all the correct statements is:
Question 139: The compressor surge effect during acceleration is prevented by the: Question 140: The purpose of the regulator of a flight deck oxygen system is to: 1. decrease oxygen pressure from 1800 PSI (in the bottles) down to about 50-75 PSI (low pressure system) 2. supply 100% oxygen 3. supply diluted oxygen 4. supply oxygen on demand 5. supply oxygen at emergency/positive pressure 6. trigger the continuous cabin altitude warning at 10000 ft cabin altitude The combination regrouping all the correct statements is: