Discharging A Battery Below 22V Causes [PDF]

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Question text Discharging a battery below 22V causes: Select one: a. the battery not to be able to recharged in the aircraft b. the polarity of the weakest cell to be inversed & the battery not to be able to recharged in the aircraft c. the polarity of the weakest cell to be inversed  Feedback Your answer is incorrect. The correct answer is: The polarity of the weakest cell to be inversed & the battery not to be able to recharged in the aircraft Question 2 Incorrect Mark 0.00 out of 0.20 Question text In three-phase generator, voltage measured from one phase to another phase is Select one: a. 320V b. 115V  c. 200V Your answer is incorrect. The correct answer is: 200V Question 3 Correct Mark 0.20 out of 0.20

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Question text Each TRU has 02 basic protection circuits inside. They are: Select one: a. Overvoltage and short circuit detection b. Undervoltage and overheat detection c. Low current detection and overheat detection  Feedback

Your answer is correct. The correct answer is: Low current detection and overheat detection Question 4 Correct Mark 0.20 out of 0.20 Question text On an aircraft equipped with an electrical flight control system such as A320, Main DC Power distribution works: Select one: a. In isolated operation  b. In parallel operation c. In parallel or isolated operation Feedback

Your answer is correct. The correct answer is: In isolated operation Question 5 Incorrect Mark 0.00 out of 0.20 Question text A Variable Speed Constant Frequency (VSCF) generator includes: Select one: a. A generator (PMG, exciter, main generator), a rectifier, a DC filter, a static inverter, an AC filter, GCU b. A generator (PMG, exciter, main generator), a rectifier, a DC filter, a static inverter, an AC filter  c. A generator (PMG, exciter, main generator), a rectifier, a DC filter, a static inverter, an AC filter, GCU, oil system Feedback

Your answer is incorrect. The correct answer is: A generator (PMG, exciter, main generator), a rectifier, a DC filter, a static inverter, an AC filter, GCU, oil system Question 6 Correct Mark 0.20 out of 0.20 Question text How much electrical energy do AC consumers need about? Select one: a.

95 %  5%

b.

c. 65% d. 60 % Your answer is correct. The correct answer is: 95 % Question 7 Incorrect Mark 0.00 out of 0.20

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Question text Over-voltage protection circuits are activated. Select one: a. after the pilot put the corresponding button.  b. Dependent on the magnitude of the overvoltage c. without time delay Feedback

Your answer is incorrect. The correct answer is: Dependent on the magnitude of the overvoltage Question 8 Correct Mark 0.20 out of 0.20 Question text  For twin-engine aircraft, AC ESS bus is normally supplied by: Select one: a. AC bus 2 b. Static inverter c. AC bus 1  Your answer is correct. The correct answer is: AC bus 1

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Question 9 Correct Mark 0.20 out of 0.20

Question text How many power sources are used for AC generation in modern aircraft? Select one: 03 04 06 05 

a. b. c. d.

Your answer is correct. The correct answer is: 05 Question 10 Correct Mark 0.20 out of 0.20

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Question text  For twin engine aircraft, DC ESS bus is normally supplied by: Select one: a. TR1 via DC bus 1  b. ESS TR via ESS AC bus c. TR2 via DC bus 2 Feedback Your answer is correct. The correct answer is: TR1 via DC bus 1 Question 11 Correct Mark 0.20 out of 0.20 Question text Battery capacity is measured in: Select one: a.

ampere-hours.  b. amperes c. volts Your answer is correct. The correct answer is: ampere-hours. Question 12 Correct Mark 0.20 out of 0.20

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Question text Output frequency of engine drive generator stays within 400Hz thanks to: Select one: a. Constant Speed Drive (CSD) via control signal from GCU  b. Exciter current via control signal from GCU c. CBMU Feedback Your answer is correct. The correct answer is: Constant Speed Drive (CSD) via control signal from GCU Question 13 Correct Mark 0.20 out of 0.20 Question text Main advantages of parallel operation are Select one: a. No power interrruption b. Share loads between generators c. Share loads between generators and No power interrruption  d. Isolated power supplies. Your answer is correct.

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The correct answer is: Share loads between generators and No power interrruption Question 14 Correct Mark 0.20 out of 0.20 Question text At terminal block of a generator installed in modern aircraft, there are: Select one: a. 3 cables b. 5 cables c. 4 cables  Your answer is correct. The correct answer is: 4 cables Question 15 Correct Mark 0.20 out of 0.20

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Question text Differential protection circuit is used to: Select one: a. Detect short circuits (without circuit breakers)  b. Detect short circuits (combining with circuit breakers) c.Detect open phase in AC distribution systems. d. Detect overload in AC distribution systems Feedback Your answer is correct. The correct answer is: Detect short circuits (without circuit breakers) Question 16 Correct Mark 0.20 out of 0.20 Question text  In multi-engine aircraft, If ground power sources include external power and APU generator, these ground power sources: Select one: a. can be switched in parallel

b. cannot be switched in parallel  c. can be switched in parallel if one main generator fails Feedback Your answer is correct. The correct answer is: cannot be switched in parallel Question 17 Correct Mark 0.20 out of 0.20 Question text External power is used for aircraft when Select one: a. on ground and during flight b. during filght c. On ground  Feedback Your answer is correct. The correct answer is: On ground Question 18 Incorrect Mark 0.00 out of 0.20 Question text Which of the following is the most probable reason for overload condition? Select one: a. One generator is switched off due to failures b. All galleys and entertainment system are turned on simultaneously  c. Voltage and frequency regulators fail at the same time Feedback

Your answer is incorrect. The correct answer is: One generator is switched off due to failures Question 19 Incorrect Mark 0.00 out of 0.20 Question text If the battery is switched off in flight, the.

Select one: a. Captain's instruments will be powered from the stanby bus  b. battery is disconected from bus c. Generator voltage falls to Zero Feedback Your answer is incorrect. The correct answer is: battery is disconected from bus Question 20 Correct Mark 0.20 out of 0.20 Question text If the CSD fail, the generator will be affected: Select one: a. current b. frequency  c. voltage d. Phase Your answer is correct. The correct answer is: frequency Question 21 Correct Mark 0.20 out of 0.20

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Question text In a generator, the overvoltage failure is: Select one: a. The voltage at the point of regulation drops under 100V b. The voltage at the point of regulation exceeds 130V  c. The voltage at the terminal point exceeds 130V Feedback

Your answer is correct. The correct answer is: The voltage at the point of regulation exceeds 130V Question 22 Correct Mark 0.20 out of 0.20 Question text EMER GEN is driven by: Select one: a. An electrical motor b. A hydraulic motor  c. Constant Speed Drive (CSD) Feedback Your answer is correct. The correct answer is: A hydraulic motor Question 23 Correct Mark 0.20 out of 0.20 Question text In order to provide a power source of 115VAC, 400Hz, Engine driven generator and APU generator are installed in the aircraft. They are Select one: a. Identical in function but different in operation  b. Only different in rated power c. Totally identical Feedback Your answer is correct. The correct answer is: Identical in function but different in operation Question 24 Correct Mark 0.20 out of 0.20 Question text The emergency generator supplies 115 V AC directly to Select one: a. AC Essential and Emergency Busses  b.

AC Essential buses c. AC main buses Feedback

Your answer is correct. The correct answer is: AC Essential and Emergency Busses Question 25 Correct Mark 0.20 out of 0.20 Question text GCU detects an overvoltage condition when POR exceeds 130V. This occurs when: Select one: a. There is an overload in distribution lines b. Generator drive speed regulation fails c. Voltage regulator delivers too large exciter current  Feedback Your answer is correct. The correct answer is: Voltage regulator delivers too large exciter current Question 26 Correct Mark 0.20 out of 0.20 Question text Electrical power in aircraft is mainly used for: Select one: a. Heating (galley, anti-icing); Lighting (cockpit, cabin, exterior); Mechanical power (pumps, valves, motion); Electronic devices (computers, controls, indications, sensors)  b. Lighting (cockpit, cabin, exterior); Electronic devices (computers, controls, indications, sensors). Heating needs hot air only c. Heating (galley, anti-icing); Lighting (cockpit, cabin, exterior); Electronic devices (computers, controls, indications, sensors). Pumps and valves needs hydraulic power Feedback Your answer is correct. The correct answer is: Heating (galley, anti-icing); Lighting (cockpit, cabin, exterior); Mechanical power (pumps, valves, motion); Electronic devices (computers, controls, indications, sensors) Question 27 Correct

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Question text Which statement is NOT true for power source switching? Select one: a.  Power source switching is performed by GCUs or GPCU via electrical motors  b. Automatic switching transfers power sources for flight operation whereas manual switching mainly transfer ground power sources. c. A power source switching always occurs when an existing power source is lost or when a new power source becomes available. Feedback

Your answer is correct. The correct answer is: Power source switching is performed by GCUs or GPCU via electrical motors Question 28 Correct Mark 0.20 out of 0.20 Question text Where does the GCU get its normal power?. Select one: a. RAT. b. Battery. c. PMG Your answer is correct. The correct answer is: PMG Question 29 Correct Mark 0.20 out of 0.20 When mixing electrolyte: Select one:

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Question text

a. water is always added to the acid b. it is not important how water and acid are mixed.

c. acid is always added to the water  Feedback Your answer is correct. The correct answer is: Acid is always added to the water Question 30 Incorrect Mark 0.00 out of 0.20 Question text Which statement is NOT true for AC power sources used in modern jet aircraft? Select one: a. Normal AC power sources provide DC power via TRUs  b. They provide 115V, 400HZ, 3 phase power c. They provide about 95% of the total electrical energy Feedback Your answer is incorrect. The correct answer is: They provide about 95% of the total electrical energy Question 31 Correct Mark 0.20 out of 0.20 Question text GCU protection function can be divided into: Select one: a. 02 groups        b. 03 groups  c. 04 groups d. 05 groups Your answer is correct. The correct answer is: 03 groups Question 32 Correct Mark 0.20 out of 0.20

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Question text

Receptacles for external power connection consists of: Select one: a. 04 thin, short pins & 02 thick, long pins b. 04 thick, long pins & 02 thin, short pins  c. 03 thin, short pins & 02 thick, long pins d. 03 thick, long pins & 01 thin, short pin Feedback

Your answer is correct. The correct answer is: 04 thick, long pins & 02 thin, short pins Question 33 Incorrect Mark 0.00 out of 0.20 Question text In Airbus aircraft, electrical data can be shown on: Select one: a. Upper ECAM for AC and DC data b. Lower ECAM for AC and DC data  c. Lower ECAM for AC data only, DC data not shown on any display units Feedback Your answer is incorrect. The correct answer is: Upper ECAM for AC and DC data Question 34 Correct Mark 0.20 out of 0.20 Question text GCU for the emergency generator provides the main functions: Select one: a. For parallel operation b. For isloated operation  c. Both parallel and isolated operation

Feedback Your answer is correct. The correct answer is: For isloated operation Question 35 Incorrect Mark 0.00 out of 0.20 Question text A fuse-type current limiter. Select one: a. open a circuit after current condition has been exceeded b. Can be use as a radio suppressor c. limits current flow to loads  Feedback Your answer is incorrect. The correct answer is: Open a circuit after current condition has been exceeded Question 36 Correct Mark 0.20 out of 0.20 Question text AC power is generated using by Select one: a. a static inverter b. a constant speed generator or VSCF c. a constant speed generator or a static inverter or VSCF  d. a constant speed generator Feedback Your answer is correct. The correct answer is: A constant speed generator or a static inverter or VSCF Question 37 Incorrect Mark 0.00 out of 0.20 Question text If generator load current in phase A is zero and in normal range for the other two phases, the GCU triggers a protection circuit of: Select one:

a. Open phase b. undervoltage  c. Overvoltage d. Short circuit Your answer is incorrect. The correct answer is: Open phase Question 38 Incorrect Mark 0.00 out of 0.20 The fuction of Static Inverter is Select one:

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Question text

a. Convert 115V three phases to 28V DC b. Convert 28V Dc to 115 V AC  c. Convert 115V AC to 28 V AC d. Convert 24V Dc to 115 V AC Feedback Your answer is incorrect. The correct answer is: Convert 24V Dc to 115 V AC Question 39 Correct Mark 0.20 out of 0.20 Question text Manual action on bus tie pushbutton (switched to OFF) will: Select one: a. prevent all generators from supplying to normal consumers b. inhibit a closure of the bus tie power relays 

c. make power supply from left to right side or vice versa possible Feedback Your answer is correct. The correct answer is: Inhibit a closure of the bus tie power relays Question 40 Incorrect Mark 0.00 out of 0.20 Question text In a multi-generator system, the generator which takes more than its reactive power share is protected by. Select one: a. Over voltage and under frequency protecion circuits b. Over voltage and over frequency protecion circuits  c.Over voltage and under voltage protecion circuits Feedback Your answer is incorrect. The correct answer is: Over voltage and under voltage protecion circuits Question 41 Incorrect Mark 0.00 out of 0.20 Question text During a normal engine shutdown, generator tripping is initiated by. Select one: a. overcurrent  b. underfrequency c. Undervoltage Your answer is incorrect. The correct answer is: Undervoltage Question 42 Correct Mark 0.20 out of 0.20

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Question text When two IDGs in twin engine aircraft fails, DC EMER bus is supplied by: Select one: a. TR2 via DC bus2 or ESS TR via DC ESS bus

b. Battery only  c. TR1 via DC bus1 or ESS TR via DC ESS bus Your answer is correct. The correct answer is: Battery only Question 43 Correct Mark 0.20 out of 0.20

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Question text Thermal runway occurs when a battery is charged with: Select one: a. Battery discharged b. Constant voltage  c. Constant current Feedback Your answer is correct. The correct answer is: Constant voltage Question 44 Incorrect Mark 0.00 out of 0.20 Question text The CT is used to  Select one: a. measure the  DC current b. measure the  AC current c. measure the voltage   Feedback Your answer is incorrect. The correct answer is: Measure the  AC current Question 45 Correct Mark 0.20 out of 0.20 Question text  Which of the followings are considered distribution failures?

Select one: a. Over/under-voltage; over/under-frequency; underspeed b. Underspeed, Differential protection c. Overload; Open phase; Short-circuit  Feedback Your answer is correct. The correct answer is: Overload; Open phase; Short-circuit Question 46 Correct Mark 0.20 out of 0.20 Question text Electrical power supplying all systems to operate the aircraft safely is called Essential Power. Essential power supplies: Select one: a. Captain’s navigation, communication equipment b. Captain and First officer’s navigation and communication equipment c. Captain’s navigation, communication equipment, important control and warning systems  Feedback Your answer is correct. The correct answer is: Captain’s navigation, communication equipment, important control and warning systems Question 47 Correct Mark 0.20 out of 0.20 Question text Ground power source switching must always be performed Select one: a. Manually  b. Automatically c. Both Automatically and manually Feedback

Your answer is correct. The correct answer is: Manually Question 48 Incorrect Mark 0.00 out of 0.20

Question text A single-phase AC generator has twelve poles and it runs at 600 r.p.m. Which one of the following gives the output frequency of the generator? Select one: a. 60Hz b. 120Hz. c. 50Hz  Your answer is incorrect. The correct answer is: 60Hz Question 49 Correct Mark 0.20 out of 0.20 The output of TR units: Select one:

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a. 28VDC  b. 220VAC c. 115 VAC Your answer is correct. The correct answer is: 28VDC Question 50 Correct Mark 0.20 out of 0.20

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Question text How long can the batteries provide sufficient electrical energy in emergency condition? Select one: a. about 60 minutes with 24 V DC b. about 30 minutes with 24 V DC c. about 50 minutes with 24 V DC

d. about 30 minutes with 28 V DC

Feedback Your answer is correct. The correct answer is: about 30 minutes with 24 V DC