LOGIC GATES, ELEC AND AVIONICS SYSTEM
Logic Gates & Avionics Systems Quiz
Welcome to the Logic Gates & Avionics Systems Quiz! This comprehensive quiz covers a wide range of topics related to logic gates, electrical systems, and avionics used in aircraft. Whether you are a student preparing for exams or a professional looking to test your knowledge, this quiz is designed to challenge and engage you.
Key features of this quiz include:
- 175 insightful questions
- Covers both theoretical and practical aspects
- Multiple choice format for easy navigation
Gates wherein the inputs are inverted rather than inverting the output.
Logic Gates
Negative Logic Gates
Both
Has set and reset mode with the addition of a clock input.
S-R Flipflop
J-K Flipflop
Clock/Timer
Use transistors in ICs to construct logic gates that produce outputs related to the inputs shown in the truth tables for each kind of gate.
Electrical Circuit
Electronic Circuit
Logic Circuit
The gates are then assembled with other components to manipulate data in _______ circuits.
Analog
Digital
Logic
They use voltage or no-voltage representations of Logic 1 or Logic 0 conditions.
Analog signals
Electronic digital signals
Logic gate signals
By using a _______ of voltage and/or no-voltage outputs, a logic circuit manipulates, computes, and stores data.
Pattern
Series
Parallel
What is the AC generator used in aircraft?
Three phase
Two Phase
Two Face
What determines the voltage of an AC generator on aircraft?
The magnitude of the exciter stator voltage.
Differential unit
Drive shaft
What are the two main parts of an AC generator?
Exciter and Stator
Rotor and the Stator
Solenoid and Stators
The output of the AC Generator.
115-120V/400HZ AC
120-125V/400HZ AC
115-130V400HZ AC
Basic principle used in an AC generator.
Electromagnetic induction
Rotary Motion Induction
Thermal Induction
What drives or controls the rotary speed motion of the AC generator.
CSD
APU
IDG
Regulates the constant speed rotary motion in the CSD.
Differential gear unit
Hydraulics Unit
Speed governor
A spring-biased, flyweight-operated hydraulic control valve.
Speed Governor
Differential Unit
Hydraulic unit
Drives the CSD (connected from) from the engine.
Gear box
AC Gen
Shaft
How is a CSD generator cooled?
Absorbed by the hydraulic fluid
Air cooled
Ram air
A battery consists of one or more voltaic cells connected in series. Each cell contains two electrodes, each of which is made of a different material, and a conductive electrolyte.
DC Essential
Battery Theory
Hot Bus
The positive electrode is referred to as the ___?
electrolyte
Cathode
anode
The negative electrode is called the___?
Electrolyte
Cathode
Anode
_____ in charged state is made up of Nickel oxyhydroxide for the positive plate and Metallic Cadmium for the negative plate and during discharge the positive plate is converted to Nickel hydroxide and negative plate to Cadmium hydroxide.
Lead-Acid Batteries
Ni-Cd Battery
Alkaline battery
In Ni-Cd Battery the electrolyte is made up of ______ and ______to achieve a specific gravity of 1.3. Generally Specific gravity of Ni-Cd battery is in the range of 1.24 to 1.32.
65% distilled water and 35 % potassium hydroxide
70% distilled water and 30 % potassium hydroxide
75% distilled water and 25 % potassium hydroxide
A typical 24V Ni-Cd Battery consist of _______ connected in series.
18 or 20 cells
19 or 20 cells
17 or 20 cells
___ cells have a flooded electrolyte, and the hydrogen and oxygen gases generated during charging are vented from the cell container.
Vented
Vent
Recombinant
Cells have a starved electrolyte, and the oxygen generated from the positive electrode during charging.
Vented
Vent
Recombinant
Consist of lead compound plates immersed in a solution of sulfuric acid and water, which is the electrolyte.
Lead-Acid Batteries
Ni-Cd Battery
Alkaline battery
In Lead Acid Batteries the positive plate is filled with Lead Peroxide, negative plate is filled with pure spongy lead and an electrolyte consisting of mixture of ______ and _______by volume to achieve a specific gravity of 1.2.
25 % sulphuric acid and 75 % water
35 % sulphuric acid and 65 % water
30 % sulphuric acid and 70 % water
Aircraft Lead- Acid batteries are generally rated at 12V or 24V; hence have _____or ____ cells connected in series.
9 or 15
6 or 12
12 or 20
_____ also known as flooded or wet batteries, are assembled with electrodes (plates) that have been fully charged and dried.
Valve-Regulated Lead-Acid Batteries (VRLA)
Sealed Lead Acid Batteries
Dry Charged Cell Lead Acid Batteries
Contain all electrolyte absorbed in glass-mat separators with no free electrolyte and are sometimes referred to as sealed batteries.
Valve-Regulated Lead-Acid Batteries (VRLA)
Dry Charged Cell Lead Acid Batteries
AGM Sealed Lead Acid Battery
_____ and _____ batteries, also described as 'lithium secondary batteries' are rechargeable.
Lithium Polymer (Li-poly) and Lithium Metal (Li-iron)
Lithium-ion (Li-ion) and Lithium Metal (Li-iron)
Lithium-ion (Li-ion) and Lithium Polymer (Li-poly)
_____ batteries, also described as 'lithium primary batteries' are non-rechargeable.
Lithium-ion
Lithium Metal
Lithium Polymer
Overfilling a wet cell battery can cause _________. Likewise, damage to the battery case caused by mishandling, overcharging or freezing can result in the same way.
Battery leakage
Battery Overcharging
Excessive Battery Discharge
This is due to faulty charging equipment or inappropriate maintenance practices.
Battery Bus Fault or Fire
Battery Overcharging
Excessive Battery Charging Rate
Some battery types are vulnerable to high rates of discharge.
Excessive Battery Charging Rate
Battery Internal Failure or Short Circuit
Excessive Battery Discharge Rate
It cannot be electrically isolated from the source battery without physically removing the battery.
Hot Bus Bar
Battery terminals
Components
I, II
I, II, III
I, III
The rate at which energy is absorbed as heat within the battery
Minimum charging voltage and the number of cells in the battery
Maximum charging voltage and the number of cells in the battery
Relationship between charging voltage and the number of cells in the battery
In lead-acid batteries, the voltage per cell must not exceed
2.35 volts
2 volts
1.6 volts
In nickel-cadmium batteries, the voltage per cell must not exceed
1.8-2 volts
1.5 - 1.6 volts
1.4 – 1.5 volts
An engine-driven generator, capable of supplying the required voltage, is connected through the aircraft electrical system directly to the battery.
Constant Voltage Charging
Constant Current Charging
Alternator
Ni-Cd batteries have a ventilation system to control the temperature of the battery. A combination of high battery temperature (in excess of 160 °F) and overcharging can lead to a condition called
Thermal Loss
Thermal Runaway
Battery Runaway
Occurs during recharging by an aircraft constant voltage charging system
Thermal runaway
Excessive Battery Charging Rate
Cell Imbalance
To correct a cell imbalance during reconditioning the battery is typically discharged to zero capacity and then recharged
Deep cycle
Routine check
Cell calibration
Provide AC power through an external plug on the nose of the aircraft, may be either portable or stationary units
Auxiliary Power Unit
Ground Power Unit
Ground Cart Supply
It is installed in the aircraft as a safety backup to provide electrical and hydraulic power if the primary sources of aircraft power, that is main AC Bus1 and AC Bus 2 are both lost which is mostly happens due to both engine failures.
Batteries
Ram Air Turbine (RAT)
AC ESS
Ram Air Turbine is deployed automatically if all AC electrical power sources are lost, and the aircraft speed is greater than _____________.
100 kts
100 mph
100 kph
The aircraft electrical system is supplied by two engine driven generators regulated in speed by integrated drives.
True
False
A third AC generator driven by the _______ can replace one or both main engine generators throughout the flight envelope.
RAT
APU
Batteries
A/An ____________ is driven by the Ram Air Turbine (RAT) hydraulic circuit. It automatically provides emergency power in case of failure of all main aircraft generators.
AC Emergency GEN
DC Emergency GEN
AC ESS
DC generation is accomplished by _____________
Static Inverter
Transformer Rectifier
Integrated Drive Generator
On batteries only, the _______________connected to battery 1 supplies the AC STAT INV BUS
Static Converter
Transformer Rectifier
Static Inverter
The main and secondary electrical circuits of the galleys are supplied by _____________.
AC BUS 1 and 2
DC BUS 1 and 2
AC ESS
Two batteries can be connected to the _____________. Each battery has its own bus, HOT BUS 1 and HOT BUS 2.
AC BAT BUS
DC BAT BUS
AC ESS
The DC ESS BUS is supplied by the DC BAT BUS. In an emergency, it is supplied either by battery 2 or by essential TR.
True
False
The GCU performs a number of functions related to the regulation, sensing, and protection of the DC generation system.
True
False
The Airbus A320 has _______ batteries in its main electrical system.
1
2
4
What is the significance of green collared circuit breakers?
Green collared circuit breakers are pulled when flying on battery power only.
Green collared circuit breakers are monitored by the ECAM.
Green collared circuit breakers should not be reset.
Is it possible to parallel generators?
Yes
Only with the RAT deployed.
The electrical system will not allow paralleling of generators.
On the A320, the static inverter works:
Always
When aircraft speed is greater than 50 kt and on batteries only.
When one main generator fails.
Only when generator 2 fails.
On the A320, what does the blue EXT PWR ON light mean?
External power is plugged in and parameters are normal
External power is supplying the aircraft’s electrical system.
There is a fault with the external power.
A battery fault light will illuminate when:
The batteries have auto disconnected due to low voltage.
Battery voltage drops below a predetermined level.
Battery charging current increases at an abnormal rate.
The BCL monitors battery charging and controls its battery contactor.
True
False
Which of the following converts AC voltage to DC voltage?
Static Inverter
Transformer Rectifier
Transformer
When the aircraft speed is below 50 knots, the inverter is activated if nothing but the batteries are supplying electrical power to the aircraft and the BAT 1 and BAT 2 pushbuttons are both on at auto.
True
False
The Airbus A320 has _______ transformer rectifiers in its electrical system.
2
1
3
The ___ safety clip is used when the closure of a circuit breaker must be prevented. This is necessary when the connected circuit is not allowed to operate because of missing components or certification.
Grey
Orange
Red
An AC generator converts the mechanical input power from the engine, the APU or the emergency hydraulic motor or the ram air turbine into the required electrical power.
True
False
What is the output power of an Emergency Generator?
15KVA
9KVA
5KVA
APU Generator is located at __
Aft fuselage
Tail Cone
Horizontal stabilizer
The last source of electrical power is the RAT
True
False
If Engine 1 malfunctions, the Engine 2 IDG automatically supplies the AC Bus 1 via
Generator Control Unit (GCU)
Circuit Breaker
Bus Tie Contactor
The process of monitoring and controlling the movement of aircraft from one place to another.
Communication
Navigation
Surveillance
The act of conveying meanings from one entity or group to another through the use of mutually understood signs, symbols and semiotic.
Surveillance
Navigation
Communication
The monitoring or close observation of behavior, activities, or information for the purpose of influencing, managing or directing.
Navigation
Surveillance
Communication
The navigation by extrapolating; determining the present position through the knowledge of a previous reference position.
Radio Nav
Inertial Nav
Dead Reckoning
The navigation thru the use of wireless communication signals broadcasted by Ground or Aircraft based radio station.
Radio Nav
Communication
Inertial Nav
The navigation based on double integrating aircraft acceleration measured using airborne equipment (airspeed sensors, rate sensors, etc)
Inertial Nav
Radio Nav
Satellite Nav
It indicates the rate of turn, and how fast banking is being performed but does not indicate the bank angle, or pitch info.
Turn and slip indicator
Heading indicator
Turn coordinator
It indicates when an aircraft is making a turn and how fast the heading changes but does not indicate the bank angle. Only shows the direction of turn and the rate of turn.
Turn and slip indicator
Heading indicator
Turn coordinator
It is also known as direction indicator, sometimes directional gyro. It is used in almost all airplanes to show heading information.
Turn and slip indicator
Heading indicator
Turn coordinator
It consists of an electrically driven gyro spinning about a vertical axis and providing pitch and roll reference for automatic flight control and pitch and roll indications on the flight instruments.
Gyro
Horizontal gyro
Vertical gyro
In a vertical gyro, pitch and roll data is transmitted to using systems by means of ___.
Synchros
Servos
Sensors
How many vertical gyros are installed in an aircraft?
2
6
4
It contains desiccant materials and is installed on a gyro case.
Mercury float tank
Dehydrator plug
Sensitive element
It is an electronic magnetometer that measures the direction of the horizontal component of the earth's geomagnetic field relative to the aircraft.
Magnetic detector
Electromagnetic valve
Flux valve
It is also called heading indicator, is a flight instrument used in an aircraft to inform the pilot of the aircraft's heading.
Directional gyro
Turn coordinator
Attitude indicator
It is the means by which aircraft crews connect with other aircraft and people on the ground to relay information.
Aircraft navigation
Aircraft communication
Meteorological service for international air navigation
It is used by members of the flight crew to communicate between each other in the cockpit
Flight interphone
Cabin interphone
Cockpit interphone
This panel lets the cockpit crew gain the attention of a ground mechanic or the cabin crew by triggering visual and audio signals.
Cockpit panel
Audio panel
Call panel
For mechanic call the horn will sound, for cabin crew a ______ will be broadcast on respective areas.
VHF sound
Single beep
High low chime
Location of the EVAC panel on the cockpit
Center pedestal, right and left
Overhead panel
Beside the ECAM
It allows the evacuation command to be activated from the cockpit only or from the cockpit and the pursers station.
EVAC command computer
EVAC Panel
MCDU
Which of these are included on Audio Management Unit (AMU)
Cockpit Voice recorder, Voice overhead, Headset, Oxygen Mask
Hand Microphone, Boomset headset, Loudspeaker, Audio Control Panel, Oxygen mask
MCDU, IR, ADR, Navigational Display
It is a signaling method which can alert an individual aircraft that a ground station wishes to communicate with it.
SELCAL (Selective Calling)
SELCAL (Selective Calibration)
Selective Radio Wave Transmission
Receipt of an assigned SELCAL code _________which may be a light, an audible chime or both.
Illuminates and cockpit SELCAL indicator
Activates a flight deck call system
Notifies the captain for SELCAL request from ATC
TRUE or FALSE: SELCAL codes are assigned to aircraft operators and to individual aircraft.
True
False
How many tones in old SELCAL
14
8
12
An electromagnetic based detection system that works by radiating EM waves, and then studying the ”echo” or reflected back waves.
Radio waves
Radio Frequency
Radio Detection and Ranging (RADAR)
A RADAR Consists of a transmitter that produces _____ that is radiated into space by an antenna.
Radio interference
Electromagnetic signal
Spectrometric Electrical Signal
Consists of a Constant Speed Drive (CSD) and AC generator mounted side by side in a single housing assembly.
Integrated Drive Generation
Internal Drive Generator
Integrated Drive Generator
Uses controlled differential action to maintain the constant output speed necessary to power the generator.
Integrated Drive Generator
Constant Speed Drive
AC Generator
The IDG is driven by what component that is accessible in the engine nacelle.
Turboshaft
External Accessory Gearbox
Reduction Gearbox
It is used to monitor the oil level of the IDG, which is a tube-shaped level sensor and indicator.
U tube
Venturi tube
Sight glass
First, be careful when working on engine components shortly after the engine is shut down. Engine components, including the IDG, can remain hot for up to an hour after use. Not only are the metal pieces extremely hot, the oil will be scalding. Wear goggles, insulated gloves, and other protective clothing. Oil of such high temperatures can burn eyes or skin, requiring serious and immediate medical attention.
Servicing
Restoring
Inspection
_ can cause the filter to fail prematurely, leading to excessive wear, eventually causing the IDG to overheat.
Overspeed
Contamination of oil
Corrosion
Allows an aircraft to operate autonomously without reliance on ground support equipment such as a ground power unit, an external air-conditioning unit or a high pressure air start cart.
APU
IDG
CSD
On an aircraft, Auxillary Power Unit (APU) supplies; except.
Electrical Power
Bleed Air
Thrust
When starting an APU, what comes next after pressing APU master switch.
Press the bleed Air push button
Press the APU start button
Connect the battery
All of the following are the inputs of an AC Generator installed on an aircraft; except.
3-Phase
40 Hz
115 VAC
Output is at logic 1 when, and only when all its inputs are at logic 1, otherwise the output is at logic 0.
AND
OR
NAND
NOR
XOR
XNOR
NOT
Output is at logic 1 when one or more are at logic 1. If all inputs are at logic 0, output is at logic 0.
AND
OR
NAND
NOR
XOR
XNOR
NOT
Output is at logic 0 when, and only when all its inputs are at logic 1, otherwise the output is at logic 1.
AND
OR
NAND
NOR
XOR
XNOR
NOT
Output is at logic 0 when one or more of its inputs are at logic 1. If all the inputs are at logic 0, the output is at logic 1.
AND
OR
NAND
NOR
XOR
XNOR
NOT
Output is at logic 1 when one and only one of its inputs is at logic 1. Otherwise, is it logic 0.
AND
OR
NAND
NOR
XOR
XNOR
NOT
Output is at logic 0 when one and only one of its inputs is at logic 1. Otherwise, it is logic 1.
AND
OR
NAND
NOR
XOR
XNOR
NOT
Output is at logic 0 when its only input is at logic 1, and at logic 1 when its only input is at logic 0.
AND
OR
NAND
NOR
XOR
XNOR
NOT
AND
OR
NAND
NOR
XOR
XNOR
NOT
AND
OR
NAND
NOR
XOR
XNOR
NOT
AND
OR
NOT
Buffer
AND
OR
NOT
Buffer
Which is not part of the six basic instruments?
A. Altimeter
B. Pressure gauge
C. Attitude indicator/ attitude gauge
Both b and c
Which is not included in the basic T?
Airspeed indicator
Artificial Horizon indicator
Vertical speed indicator
Altimeter
Which is not a pressure type instrument?
Airspeed indicator
Artificial Horizon indicator
Vertical speed indicator
Altimeter
Which is a drain opening included in a pitot-static system?
Avoid pressure build up
Release moisture
Counteract the effects of gravity
None of the above
What type is the anti-icing and de-icing of a pitot-static system?
Pneumatic
Electrical
De-icer boots
Hydraulic
Which instrument will continue to provide readings, even if it is incorrect, if only the static port is blocked?
Altimeter
Vertical speed indicator
Airspeed indicator
None of the above
Pitot-static probes have…
Its pitot tube and static source in a one location
Pitot tube and static ports are in different locations
Two static ports
Two pitot tubes
Why is the pitot-static system in a cross-feed design?
To ensure that the captain side will always have the right reading
To ensure that the FO side will always have the right reading
To ensure that both sides will always have the right reading
For checking of accuracy of readings
The following are types of airspeed except:
IAS
ASL
TAS
Does Air Density affects Aircraft Performance
True
False
The Altitude indicated on the altimeter when the correct barometric pressure is set.
Indicated Altitude
True Altitude
Absolute Altitude
The altitude indicated by the altimeter, based on a standard atmospheric level.
Indicated Altitude
Absolute Altitude
Pressure Altitude
Is sometimes used in Flight Planning Calculations
Density Altitude
Pressure Altitude
Absolute Altitude
The following are Part of the Four Basic Aircraft Instrument except:
Flight Instruments
Ground Instruments
Miscellaneous Instruments
_ is used to sense the temperature of air flow passing through cavities within its strut.
Pitot Static Tube
Bourdon Tube
Total Air Temperature Probe
True Airspeed adjusted for wind resistance factors.
Ground Speed
Indicated Airspeed
Calibrated Airspeed
Airspeed reading without any consideration for Atmospheric Conditions or potential Installation and Instrument Errors
Indicated Airspeed
Calibrated Airspeed
True Airspeed
Calibrated Airspeed corrected for altitude related atmospheric conditions such as temperature variations and air density.
Indicated Airspeed
Calibrated Airspeed
True Airspeed
External Communication System of Aircraft allows it to communicate with:
Other Aircraft, Ground Stations, Satellites
Navigational Aids
Pushback Crew at the Ramp
Internal Communication System of Aircraft allows the pilots to communicate with:
Air Traffic Control
Ground crew for pushback
Other aircraft in the airspace
Allows Cabin Crew to communicate with each other in different parts of the aircraft, as well as talking to the pilots
Service Interphone
Flight Interphone
Cabin Interphone
What is this and what is it for?
Audio Control Panel; Tuning all Communication Radios
Radio Management Panel; Controlling the Volume of the Transmission/Reception
Radio Management Panel; Tuning all Communication Radios
What is this and what is it used for?
Audio Control Panel; Tuning all Communication Radios
Audio Control Panel; Controlling the Volume of the Transmission/Reception
Radio Management Panel; Tuning all Communication Radios
VHF 3 is used for
Aircraft Communication Addressing and Reporting System (ACARS)
Aircraft Communication And Reporting System (ACARS)
None of the Above
Used for when the aircraft is beyond the useful range of VHF Radios
Harris Radio
HF Radio
All of the Above
All are primary radars except:
GPWS
ASMI
SSR
All are secondary radars except:
ADS B
PSR
TCAS
What is the frequency range that is used for Over the horizon surveillance; low range and low resolution?
3-30 MHz
50-330 MHz
300-1000 MHz
What is the frequency range that is used for Long range (line of sight) surveillance; Foliage penetration (FOPEN), counter-stealth, ground penetrating; low/medium resolution?
1-2 GHz
50-330 MHz
300-1000 MHz
It is the highest peak of the Frequency.
Peak
Crest
Trough
It is the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path.
Frequency
Wavelength
Amplitude
All are types under pulse radar except:
Doppler effect
MTI
Continuous wave radar
The distance from the crest top of one wave to the crest of the next wave is the wavelength.
Wavelength
Frequency
Amplitude
It is used to identify an object location in an airspace.
PSR
SSR
CWV
It shows Aircraft call sign, altitude, speed, squawk code, destination, etc. And requires transponder.
PSR
SSR
CWV
Are components that needs power to work or supplies power to the circuit.
Active Components
Passive Components
Power Source
Are components that does not need any power to work.
Active Components
Passive Components
Accessory Components
What does ADIRU stands for?
Air Data Information Reference Unit
Air Data Inertial Ranging Unit
Air Data Inertial Reference Unit
Convert the number 8 into binary.
1000
111
1001
It is a written system for expressing numbers as symbols.
Truth Table System
Numbering System
Alphabet System
It is the smallest unit of data in a computer.
Bug
Bit
Byte
A string of eight bits
Data
Octal System
Byte
This is a systemic way of displaying binary data. It illustrates the relationship of binary inputs to its output.
Binary Numbering System
Truth Table
Logic Gates
TRUE OR FALSE: When a switch is considered ON, it is represented by the digit 0 (Zero).
True
False
It is represented by the digit 1.
High
Low
None of the above
Is a device that acts as a building block for digital circuits. They perform basic logical functions that are fundamental to digital circuits.
Logic Gates
Byte
Data
This electrical component is used to ensure that current flows in one direction only.
Check Valve
Switch
Diode
This electrical component can be used to act as a switch or an simplifier. It utilizes its Base, Collector, and Emitter leads to perform its functions.
Thermistor
Transistor
Transmitter
Convert the Decimal 56 to a Binary Number.
000111
001110
111000
Convert the Decimal 23 to a Binary Number.
10111
10101
10110
Convert the Decimal 47 to a Binary Number.
101111
110100
101101
Convert the Decimal 69 to a Binary Number.
1000101
1001010
1000110
Convert the Decimal 17 to a Binary Number.
10111
10101
10001
What is Y If A is 0 and B is 1?
1
0
What is Q If A and C is 1 and B is 0?
1
0
Awit sino ba gumawa neto?
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