Worksheets1501-1600
Total questions: 100
Worksheet time: 50mins
Name
Class
Date
1.
1501. The equipment cooling system is (Level 2)
a)
a) A sub system of Air conditioning system
b)
b) Independent of Air conditioning system
c)
c) Semi-dependent of Air conditioning system
2.
1502. Which method of cabin pressure leakage test requires people in cockpit for monitor the system (Level 2)
a)
a) Use APU and switch on packs
b)
b) Use special external equipment via the low pressure ground connector
c)
c) When use APU or external power
3.
1503. Cockpit air supply uses (Level 2)
a)
a) Fresh air only
b)
b) Recirculation air only
c)
c) Mixed air
4.
1504. If the cabin altitude increases above normal values, according to the flight altitude (Level 2)
a)
a) The passenger will get the oxygen mask first
b)
b) The flight crew will get the oxygen mask first
c)
c) The flight crew and passenger get oxygen mask at the same time
5.
1505. When the cabin altitude increases, the volumetric flow (Level 2)
a)
a) Increases
b)
b) Decreases
c)
c) Keep constant
6.
1506. A red warning light on the door flashing indicates (Level 2)
a)
a) Door is locked and armed
b)
b) Door is locked and dis-armed
c)
c) The cabin is pressurized
7.
1507. At very end of the pack system, it is (Level 2)
a)
a) The check valve
b)
b) The pack sensor
c)
c) The water separator
8.
1508. Air exiting the compressor side of an ACM (Level 3)
a)
a) Will have decreased pressure and temperature.
b)
b) No change in temperature or pressure as it is a centrifugal compressor.
c)
c) Will have increased pressure and temperature.
9.
1509. If pressurization air supplies come from an engine compressor, an internal oil leak will. (Level 3)
a)
a) Not affect the issue as it is automatically detected and vented overboard.
b)
b) Contaminate the air.
c)
c) Not contaminate the air.
10.
1510. How to check the position of the equipment cooling system (Level 3)
a)
a) By look at the valve position
b)
b) By check the indication on display unit in cockpit
c)
c) By look at the valve position and check the indication on display unit in cockpit
11.
1511. Pressurization control ensures that. (Level 3)
a)
a) At operational altitude the cabin altitude is below 8,000 ft.
b)
b) Pressurization does not start before aircraft is above 8,000 ft.
c)
c) The cabin is always maintained at sea level.
12.
1512. Cabin pressure controller maintains a pre-set cabin altitude by. (Level 3)
a)
a) Regulating the mass flow into the cabin.
b)
b) Regulating the position of the inward relief valve.
c)
c) Regulating the position of the outflow valve.
13.
1513. For cargo ventilation, blower and extract fan operate when the isolations valve (Level 3)
a)
a) Fully closed
b)
b) Fully open
c)
c) Partially open
14.
1514. For air conditioning equipment system, in flight the exhaust air goes (Level 3)
a)
a) Outboard to the atmosphere
b)
b) To the underfloor area or to the forward cargo compartment
c)
c) To the mixer to warm up pack air
15.
1515. The bypass valve is fully opened and the ram air doors are nearly closed for what purpose? (Level 3)
a)
a) For maximum heating
b)
b) For maximum cooling
c)
c) For depressurizing cabin pressure
16.
1516. What does the electrical power system mainly consists of (Level 1)
a)
a) Generation subsystem, consumers.
b)
b) Generation subsystem, distribution subsystem.
c)
c) Distribution subsystem, consumers.
17.
1517. How are generation and distribution split into (Level 1)
a)
a) One phase and three phase
b)
b) AC subsystem and a DC subsystem
c)
c) One phase and multi-phase
18.
1518. Which electrical power is generated by emergency generator (Level 1)
a)
a) DC
b)
b) One phase AC
c)
c) Three phase AC
19.
1519. Which AC power is generated by static inverter (Level 1)
a)
a) One phase
b)
b) Three phase
c)
c) Two phase
20.
1520. Which type of battery is used in modern aircraft (Level 1)
a)
a) Lead acid battery
b)
b) Nickel cadmium battery
c)
c) Lead acid battery or nickel cadmium
21.
1521. How does the battery provides 24 volts DC to the DC power distribution (Level 1)
a)
a) On the ground and during normal flight
b)
b) During flight in an emergency condition when A/C has total generator loss or on the ground in certain cases.
c)
c) During flight in an emergency condition when A/C has total generator loss only
22.
1522. Which consumers are of DC power consumers (Level 1)
a)
a) Battery, static inverter, DC motor, solenoid
b)
b) Static inverter, DC motor, solenoid, transformer
c)
c) Battery, static inverter, DC motor, solenoid, rectifier
23.
1523. Concerning electrical power, what is function of bus (Level 1)
a)
a) Transferring data
b)
b) A bus connects the power source to all the electrical consumers which use the same type of electrical power.
c)
c) Provides a connection between the two source
24.
1524. What is property of bus (Level 1)
a)
a) Low resistance
b)
b) High resistance
c)
c) High resistance at low temperature
25.
1525. How is the main AC bus normally shown on electrical schematics (Level 1)
a)
a) As a single bus
b)
b) As a single bus with a '3p' label
c)
c) As 3 single bus
26.
1526. How is the power source switching controlled (Level 1)
a)
a) Manually
b)
b) Automatically
c)
c) Either automatically or manually
27.
1527. When is engine driven generator switched automatically to the power distribution (Level 1)
a)
a) Voltage and frequency are OK, aircraft in flight and no failure is detected
b)
b) Voltage and frequency are OK and no failure is detected
c)
c) Voltage or frequency are OK and no failure is detected
28.
1528. How is ground power source switching performed (Level 1)
a)
a) Always manually
b)
b) Always automatically
c)
c) Either automatically or manually
29.
1529. Which AC power is generated by emergency generator (Level 1)
a)
a) One phase
b)
b) three phase
c)
c) two phase
30.
1530. Which component is used as the safety devices (Level 1)
a)
a) fuses and circuit breakers
b)
b) Contactor, breaker and circuit breakers
c)
c) Contactor, breaker, fuses and circuit breakers
31.
1531. Which component is used as the measuring devices (Level 1)
a)
a) Transformers rectifier
b)
b) Contactor, breaker
c)
c) Current transformers
32.
1532. Which component is used as the switching devices (Level 1)
a)
a) Contactor, breaker and circuit breakers
b)
b) Contactor, breaker
c)
c) Contactor, breaker, fuses and circuit breakers
33.
1533. How to hold the contacts of contactor in the closed state (Level 1)
a)
a) A DC current flow the coil continuously
b)
b) Only a short current pulse
c)
c) A latching device, normally a permanent magnet, is used
34.
1534. How to hold the contacts of breaker in the closed state (Level 1)
a)
a) A DC current flow the coil continuously
b)
b) Only a short current pulse
c)
c) A latching device, normally a permanent magnet, is used
35.
1535. How to switch breaker from the closed state to open/ trip state (Level 1)
a)
a) Interrupt current flow the coil
b)
b) A short pulse is fed to the coil in the opposite direction
c)
c) A short pulse is fed to the second coil
36.
1536. How to prevent over-limit current (Level 1)
a)
a) A circuit breaker or fuse is installed
b)
b) A breaker or fuse is installed
c)
c) A circuit breaker or breaker is installed
37.
1537. What is trip free type circuit breaker (Level 1)
a)
a) Circuit breaker is able to open an overloaded circuit even if the control knob mechanism is blocked.
b)
b) Circuit breaker is not able to open an overloaded circuit if the control knob mechanism is blocked.
c)
c) Circuit breaker is able to be closed remotely.
38.
1538. Which is used as circuit breaker markings (Level 1)
a)
a) Safety collar, safety clip and safety tags
b)
b) Safety clip and safety tags
c)
c) Colored collar, safety clip and safety tags
39.
1539. On modern A/C, which source is normally used as input of transformer rectifier (TR) (Level 2)
a)
a) One phase AC
b)
b) three phase AC
c)
c) DC
40.
1540. How can each part of the distribution system be supplied with electrical power (Level 2)
a)
a) Main power and essential power are supplied with electrical power from a normal source and, in case of loss of this source, from an alternate source, emergency power are supplied with electrical power from only source.
b)
b) Essential power are supplied with electrical power from a normal source and, in case of loss of this source, by an alternate source, main power and emergency power are supplied with electrical power from only source.
c)
c) Each part of the distribution system can be supplied with electrical power from a normal source and, in case of loss of this source, from an alternate source
41.
1541. In the event of a failure in the main power distribution or its power sources, how is the essential power supplied (Level 2)
a)
a) The remaining power source as long as any part of it is available, due to various switching functions.
b)
b) An emergency generator or the battery.
c)
c) The battery
42.
1542. How is the emergency power distribution supplied (Level 2)
a)
a) By the main power sources via the essential power distribution.
b)
b) An emergency generator or the battery.
c)
c) Normally by the main power sources via the essential power distribution and an emergency generator or the battery in case of total loss of the normal power sources.
43.
1543. What does main AC power distribution consists of (Level 2)
a)
a) Bus, power source switching and bus tie switching
b)
b) Generator, bus, power source switching and bus tie switching
c)
c) Generator, GCU, bus, power source switching and bus tie switching
44.
1544. Which consumers use three phase AC power source (Level 2)
a)
a) Only consumers which need all three phases at the same time to operate such as 3 phase motors and TR units.
b)
b) Consumers which need all three phases at the same time to operate and single phase consumers.
c)
c) Only large loads
45.
1545. Why must large loads be shed or switched off before we switch any power source on or off on the ground (Level 2)
a)
a) Reduce interrupt time
b)
b) Save energy.
c)
c) Improves the reliability of the power relays and prevents an overload of the power source.
46.
1546. How is large load shedded (Level 2)
a)
a) Automatic or manually
b)
b) Automatic on ground or manually
c)
c) Automatic in flight
47.
1547. When is automatic load shedding available (Level 2)
a)
a) An overload of generators is detected while aircraft in flight
b)
b) An overload of generators is detected or must be prevented by the system
c)
c) An overload of generators is detected or bus is overheat.
48.
1548. How is the power source switching performed (Level 2)
a)
a) By power relays that are controlled either by a generator control/ ground power unit
b)
b) By bus tie relays that are controlled either by a generator control/ ground power unit
c)
c) By remote controlled circuit breaker that are controlled either by a generator control/ ground power unit
49.
1549. When does a power source switching always occurs (Level 2)
a)
a) An existing power source is lost or when a new power source becomes available.
b)
b) An existing power source is lost or when a new power source becomes available or a load is shedded.
c)
c) When a new power source becomes available or a load is shedded.
50.
1550. Concerning isolated operation, what happen if one generator supplies the complete electrical power distribution. (Level 2)
a)
a) An automatic load shedding occurs
b)
b) Nothing happened
c)
c) An manual load shedding must be taken place
51.
1551. Which load is shedded to prevent an overload (Level 2)
a)
a) Lighting load
b)
b) Antice load
c)
c) Large load such as oven, coffee maker, ect
52.
1552. Concerning isolated operation, what is main purpose of bus tie push button. (Level 2)
a)
a) Switch off all power source
b)
b) Prevent bus tie switching in case of smoke in the cockpit generated by a short circuit.
c)
c) Switch off all AC power source
53.
1553. When is parallel operation allowed (Level 2)
a)
a) Generators have the same voltage and frequency and phase angle.
b)
b) Generators have the same voltage and frequency
c)
c) Generators have the same voltage and frequency and power
54.
1554. When is an automatic bus tie switching in parallel operation performed. (Level 2)
a)
a) A serious problem in the distribution like a short circuit is detected or during landing
b)
b) A serious problem in the distribution like a short circuit is detected or during automatic landing
c)
c) A serious problem in the distribution like a short circuit is detected
55.
1555. For aircraft with multi external power sources, how ground power sources synchronized. (Level 2)
a)
a) By the generator control units.
b)
b) By logic circuit
c)
c) Ground power sources cannot be synchronized
56.
1556. What happen when power source switching is performed from one power source to another one which is not allowed to work in parallel (Level 2)
a)
a) No loss of power occurs
b)
b) A loss of power for about a tenth of a second normally occurs
c)
c) A loss of power for about a tenth of a second normally occurs if switching is performed in flight
57.
1557. What is purpose of the essential power distribution (Level 2)
a)
a) Supplies all the systems that are necessary to operate the aircraft safely in electrical emergency configuration.
b)
b) Supplies all the systems that are necessary to operate the aircraft safely during automatic landing
c)
c) Supplies all the systems that are necessary to operate the aircraft safely.
58.
1558. Which power distribution most important equipment is connected to (Level 2)
a)
a) The essential power distribution
b)
b) The emergency power distribution
c)
c) The main power distribution
59.
1559. Which power sources does the emergency power distribution is normally supplied from (Level 2)
a)
a) The same power sources as the essential power distribution or emergency power sources
b)
b) Emergency power sources
c)
c) Battery
60.
1560. What is electrical emergency power source (Level 2)
a)
a) Battery and ram air turbine
b)
b) Battery
c)
c) Battery and emergency generator
61.
1561. In electrical emergency configuration while emergency generator is not ready, how is emergency power distribution normally supplied (Level 2)
a)
a) From aircraft battery via a static inverter
b)
b) From aircraft battery via a transformer rectifier (TR)
c)
c) From aircraft battery directly and via a static inverter
62.
1562. How does emergency generator supplies power to Essential and Emergency Busses (Level 2)
a)
a) Supplies AC power directly and DC power via essential transformer rectifier unit
b)
b) Supplies AC power directly only (battery supplies AC power)
c)
c) Supplies DC power directly and AC power via static inverter.
63.
1563. During the time the aircraft is parked, what must do to prevents a discharge of the battery by the emergency equipment. (Level 2)
a)
a) All batteries must be switched off
b)
b) All batteries must be switched on
c)
c) All batteries must be switched on and charged daily
64.
1564. How is hot battery bus connected to the battery (Level 2)
a)
a) Batteries must be switched off
b)
b) It is always connected directly
c)
c) Batteries must be switched on
65.
1565. A/C in flight, both of the main AC busses are lost and batteries is only power source, what happen to essential busses (Level 2)
a)
a) Automatically shed.
b)
b) Automatically supplied
c)
c) Nothing happen
66.
1566. How to prevent an accidental deployment of the RAT (Level 2)
a)
a) A circuit is used to inhibit deployment of the RAT on ground
b)
b) The manual ON pushbutton is guarded
c)
c) Deployment of the RAT is only performed when the manual ON pushbutton is press and hold for 10 second
67.
1567. What does a three phase AC power relay consist of (Level 2)
a)
a) A high power main contacts which are operated by three electro magnetic device.
b)
b) Three high power main contacts and each contact is operated by an electromagnetic device individually.
c)
c) Three high power main contacts which are operated by an electro magnetic device.
68.
1568. What does breaker need to close the contacts (Level 2)
a)
a) A DC current flow the coil continuously
b)
b) A AC current flow the coil continuously
c)
c) Only a short current pulse
69.
1569. What is advantages of breaker over the contactor (Level 2)
a)
a) The coil can be smaller because no heat is produced in the coil during the closed state
b)
b) The coil can be bigger because no heat is produced in the coil during the closed state and stays closed even when no electrical power is available.
c)
c) The coil can be smaller because no heat is produced in the coil during the closed state and stays closed even when no electrical power is available.
70.
1570. Why the over-limit current must be prevented (Level 2)
a)
a) A over-limit current is caused by a short circuit or faulty consumer and can overheat the wire and generate a fire.
b)
b) For energy saving
c)
c) To increase life of component
71.
1571. For maintenance purposes, what is advantages of circuit breakers over fuses (Level 2)
a)
a) They can be reset quickly and can also be used as manual on − off switches to allow deactivation of circuits.
b)
b) They can be replaced quickly and can also be used as manual on − off switches to allow deactivation of circuits.
c)
c) They is the easiest method of overcurrent protection
72.
1572. How does a circuit breaker work (Level 2)
a)
a) When the actual current exceeds the maximum permitted current, the temperature of the bimetal increases and starts bending so the electrical circuit is opened
b)
b) When the actual current exceeds the maximum permitted current, the resistance of the bimetal increases and a circuit detect increasing to open electrical circuit.
c)
c) When the actual current exceeds the maximum permitted current, the magnetic field increases and moves the armature and the contacts to open electrical circuit
73.
1573. What does the time that is needed to release a circuit breaker depend on (Level 2)
a)
a) Cross section of the wire
b)
b) The current that exceeds the nominal value.
c)
c) Maximum allowed current
74.
1574. When is the reset of a circuit breaker possible (Level 2)
a)
a) The bimetal is bent
b)
b) Bimetal has returned to its normal shape
c)
c) About 1 minutes since circuit breaker is tripped
75.
1575. In some modern aircraft types, what happen when circuit breakers with green control knobs is tripped (Level 2)
a)
a) Caution message, name and location of the open circuit breaker is presented on display to allows an easy identification of the circuit breaker
b)
b) Name and location of the open circuit breaker is presented on display to allows an easy identification of the circuit breaker
c)
c) Nothing happen
76.
1576. What is advantage of electronic circuit breaker (Level 2)
a)
a) Save weight and space in the cockpit and that it is possible to change the trip values via rheostat
b)
b) Save weight and space in the cockpit and that it is possible to change the trip values of the virtual circuit breaker by loading of a new software.
c)
c) Save weight and space in the cockpit and that it is possible to change the trip values via variable capacitor
77.
1577. What is purpose of fuse of electronic circuit breaker (Level 2)
a)
a) To protect electronic circuit breaker
b)
b) Fuse works as a safety backup in case of a short circuit, if the electronic circuit does not work properly.
c)
c) To protect shunt of electronic circuit breaker
78.
1578. What are advantages of 3−phase electrical power systems (Level 2)
a)
a) Easy and economic to use, neutral current which flows via the structure during normal operation is very big
b)
b) easy and economic to use, neutral current which flows via the structure during normal operation is always 0
c)
c) easy and economic to use, neutral current which flows via the structure during normal operation is very small.
79.
1579. Concerning CSD (Constant Speed Drive), which mode is used during cruise (Level 2)
a)
a) Overdrive operation.
b)
b) Straight drive operation.
c)
c) Underdrive operation.
80.
1580. How is the phase angle difference of two power source reduced to zero (Level 2)
a)
a) No way
b)
b) Voltage differences of two power source is used as correction signal to produces a small frequency difference
c)
c) Two power source is reset at the same time.
81.
1581. What is the purpose of the differential protection circuit (Level 2)
a)
a) To detect voltage difference of two phases of 3-phase generator
b)
b) To detect frequency difference of two phases of 3-phase generator
c)
c) To detect short circuits in areas where circuit breakers are not usable
82.
1582. How can voltage and frequency failures of a generator in parallel operation be detected (Level 2)
a)
a) By a load protection loop.
b)
b) By the voltage and frequency protection circuit.
c)
c) By a load division loop.
83.
1583. How to ensures an external power source cannot be permanently switched on if the connection is not performed completely (Level 2)
a)
a) A cable holding strap which supports the cable weight is installed
b)
b) A small TR unit inside the GPCU, converts the three phase AC to 28 volts DC that is sent back to external power source to holds the power relay of energized.
c)
c) The three phase AC is sent back to external power source to holds the power relay of energized
84.
1584. What is purpose of the bus tie switching (Level 3)
a)
a) Provides a connection between the two busses, between the two source (only parallel operation)
b)
b) Provides a connection between the two busses, between the two source (only isolated operation)
c)
c) Provides a connection between the two busses, between the two source
85.
1585. What is isolated operation (Level 3)
a)
a) One power source work at a time
b)
b) The power sources work in isolation from each other
c)
c) The power sources share the same
amount of load
86.
1586. In parallel operation, how are generators are synchronized (Level 3)
a)
a) Manually controlled
b)
b) Automatically controlled by logic circuit
c)
c) Automatically controlled and monitored by the generator control units
87.
1587. In isolated operation, how is bus tie controlled (Level 3)
a)
a) By the generator control units.
b)
b) By logic circuit
c)
c) By the generator control units and by logic circuit
88.
1588. What are main advantages of parallel operation over isolated operation (Level 3)
a)
a) All generators share the same part of the total load and there is no power interruption when one or several generators are switched off
b)
b) Reduce complication of generator control units operation
c)
c) High redundant for avionic equipment
89.
1589. A four engines aircraft is operating with all generators in parallel operation, what happen when bus tie 1 push button on the electrical control panel is released (Level 3)
a)
a) Remaining generators supplies all AC load
b)
b) Generator 1 supplies all AC load
c)
c) All busses are still powered, but generator 1 supplies AC bus 1, isolated from the remaining distribution, like in an aircraft with an isolated power distribution
90.
1590. Which type of operation does aircraft electrical system operate in when multi external power sources are supply to aircraft and other power sources is not available (Level 3)
a)
a) Isolated operation
b)
b) Parallel operation
c)
c) Isolated or parallel operation
91.
1591. How to prevent the problems of power interruption when AC power source switching is performed from one power source to another one which is not allowed to work in parallel (Level 3)
a)
a) AC power sources is convert to DC, supply converted DC power source in parallel, switch off old power source.
b)
b) A synchronization of the two different power sources is started before switching
c)
c) Power interruption don't need prevent
92.
1592. On an aircraft equipped with an electrical flight control system, why must MAIN DC power distribution always work in isolated operation (Level 3)
a)
a) To prevents a single failure such as a short circuit, from affecting the complete flight control system all at once.
b)
b) To save energy
c)
c) To prevents an overload of the power source.
93.
1593. How Ram Air Turbine driven emergency generator (Level 3)
a)
a) Generates the hydraulic power needed for the hydraulically driven
b)
b) Drives the emergency generator directly
c)
c) Either generates the hydraulic power needed for the hydraulically driven emergency generator or drives the emergency generator directly
94.
1594. During electrical emergency configuration (both of the main AC busses are lost), when the emergency generator is not available, which power source supply electrical power for aircraft (Level 3)
a)
a) Batteries take over automatically, it can only supply the most important equipment.
b)
b) Batteries take over automatically, it can supply all the essential equipment for flying the aircraft
c)
c) Batteries take over manually, it can only supply the most important equipment.
95.
1595. How is activation of the emergency generator performed manually (Level 3)
a)
a) On the ground only
b)
b) In flight only
c)
c) In flight or on ground
96.
1596. Concerning over-limit current, which component protect generator feeder lines (Level 3)
a)
a) Fuses or circuit breakers
b)
b) A breaker or fuse is installed
c)
c) The electronic circuits of the generator control unit (GCU)
97.
1597. How does a fuse work (Level 3)
a)
a) Like a shear pin in a mechanical linkage
b)
b) Like a rigging pin in a mechanical linkage
c)
c) Like a safety pin in a mechanical linkage
98.
1598. Which action must be done when a fuse is blown (Level 3)
a)
a) Fuse must be reset after repairing the affected circuit
b)
b) Fuse must be replaced without any action is taken place
c)
c) Fuse must be replaced after repairing the affected circuit
99.
1599. Why is use of slip rings and brushes for current transferring not used on aircraft generators (Level 3)
a)
a) It has a low reliability and produces sparks.
b)
b) It has a high reliability but produces sparks.
c)
c) It don't produces sparks but has low reliability.
100.
1600. What is main function of rotating rectifier in modern brushless generator (Level 3)
a)
a) Rectify alternating current from PMG (Permanent Magnets Generator) to generate exciter current of main generator.
b)
b) Rectify alternating current from main generator to generate exciter current of PMG (Permanent Magnets Generator).
c)
c) Rectify alternating current from exciter generator to generate exciter current of main generator.
100 %
