QST EXAM
Diesel Engine and Hydraulic Systems Quiz
Test your knowledge of diesel engines and hydraulic systems with our comprehensive quiz! Dive into questions about engine operation, components, and maintenance. Whether you're a student, professional, or just curious, this quiz is designed to challenge your understanding.
Key Topics:
- Diesel Engine Mechanics
- Hydraulic System Operations
- Generator Maintenance
- Fluid Power Systems
In a diesel engine,
Only air will be compressed
Both diesel and air will be compressed
Only diesel will be compressed
Both oil and air will be compressed
The function of an AVR (automatic voltage regulator) is
To maintain output voltage
To maintain output current
To reduce quadrature component of voltage so that reactive power is shared equally
To stabilize output current
The turbocharger is driven by
Propeller reduction gear
Exhaust gases
Crankshaft directly
Accessory drive
The 90KVA generator start up is supported by _______ battery
12Vac
12Vdc
24Vdc
24Vac
What is the sequence of the four stroke compression engine?
Induction, compression, power and exhuastion
Induction, power compression and exhaust
Induction, compression, exhaust and power
Compression, induction, power and exhuast
What is the purpose of engine oil?
Lubricate the mechanical rotating part to ensure smooth operatio
Prevent material corrosion
Assists in cooling
All of the above
Engine running speed is control by _______
Injector
Governor
Automatic voltage regulator
Exciter
A mobile generator mainly consist of prime mover engine and main AC generator. The engine consists of five basic fun
Fuel system, Air induction system, Lubrication system, Hydraulic system and cooling system
Fuel system, Air induction system, Electrical control system and cooling system.
Fuel system, Air induction system, Lubrication system, Pneumatic system and Cooling system.
Fuel system, air induction system, lubrication system, electrical control system and centrifugal inject system
In what stroke is the inlet valve and exhaust valve in fully close position?
Induction stroke
Compression stroke
Power stroke
exhaust stroke
During the weekly servicing of mobile generator, it is to ensure the engine oil level must be
Above the high mark on the dipstick
Below the low mark on the dipstick
As long the oil level can be seen on the dipstick
In between the low and high mark on the dipstick
In C.I Engine the pressure cap at the top of the radiator is to
Lower boiling point
Raise boiling point
Prevent rapid evaporation during acceleration
To release high pressure during idling
What are the steps taken to disconnect the battery from the generator?
Disconnect the negative terminal first and then the positive
Disconnect the positive terminal first and then the negative
Disconnect the positive and negative terminals simultaneously
Disconnect either positive or negative first
In a diesel engine, the the amount of fuel being fed to the combustion chamber is by the _____________
Injector pump
Carburettor
Injector
Scavenge pump
In a diesel engine, fuel is feed to the _______ in the combustion chamber.
Injector
Spark plug
Ilgitor
Spark arrestor
All excessive fuel from the injector is pump and return to the tank directly or through a _________
Scavenge pump
Pressure pump
Sump pump
Priston pump
The level of dust collected at the base of the air filter bowl shall not be
More than 1""
More than 2""
More than 0.5""
More than 3""
Mobile generator uses a _____________ supply for start up
12Vdc
12Vac
24Vdc
24Vac
In the cooling system of generator, what type of pump is used to drawn coolant for the cooling
Centrifugal pump
Scavenge pump
Piston pump
Pressure pump
Which of the following is(are) the advantages of hydraulic operation?
The power is confined to pipelines and components and therefore strengthening of the framework is unnecessary
Provides smooth and steady movement
Variation of speed of the operation can be achieved without use of gearing
All of the answers
Each drive of the hinge door consists of I. Hydraulic cylinder ii. Hydraulic power unit iii. Hydraulic wheel assembly
I and ii
I and iii
Ii and iii
I, ii and iii
What is the function of the accumulator in the hinge door drive?
To store hydraulic fluid
To maintain pressure in the system.
To exert pressure on the wheel cylinder.
To absorb and shock load present in the system.
The gas used in the accumulator of hydraulic hinge door drive system is
Air
Nitrogen
Hydrogen
Carbon dioxide
What is the pressure of the accumulator when no-load?
25 bar
50 bar
75 bar
100 bar
In the hinge door drive system, the pressure setting inthe relief valve of the Loading cyclinder is higher than that of the relief valve in the delivery line of the hydraulic pump because
When the door opens, the pressure in the cylinder will be increased
When the door closes, the pressure in the cylinder will be increased
When the polyurethane wheel rotates, the pressure in the cylinder will be increase
When the polyurethane wheel climbs over any obstruction. The pressure in the cylinder will be increased
What is the function of the throttle valve in door drive system?
Electrical mean of releasing pressurized fluid in the sump
Provide manual switching between accumulator and the sump
Control flow rate and speed operation of the door
Control direction of fluid to the wheel assembly
If the electrical motor driving the hydraulic pump is rotating in the reverse direction, what should be done?
Remove and change the motor
Interchange any 2 phases of the supply lines to the motor
Interchange all the 3 phasese of the supply lines
Remove and change to a single phase motor
Why is hydraulic drive preferred to direct electric motor drive?
Speed control can be done easily
Direction of rotation can be changed easily
A lower weight to power ratio
All the above
In a door drive system, what is the working pressure in the cylinder?
155 bar
165 bar
175 bar
185 bar
Which of the following components does not belong to the hydraulic power unit in a hinge door system?
Gear pump
Solenoid dump valve
Oil lubricator
Selector valve
What is the fully retracted length of a hydraulic cylinder?
755mm
810mm
765mm
855mm
What is the gear oil use in the hydraulic drive system?
Tellus 150
AWS 100
Tellus 100
Shell Omala 150
In the hinge door system, what is the working pressure of the hydraulic wheel drive assembly?
25 bar
50 bar
75 bar
100 bar
The function of the solenoid valve in the hydraulic sliding door drive system
The direction of flow in the variator pump, hence door movement
The direction of the rotation of the electric motor
The direction of flow of the charge pump
All of the answers
The pressure setting of the safety valves in the hydraulic sliding door drive system is
1.2 times working pressure
1.5 times working pressure
2.0 times working pressure
5.0 times working pressure
What is/are the fault(s) that causes the compartment 1 auto-door inoperative?
No power supply to the center compartment
No power supply to compartment 3
No power supply to compartment 1
No power supply to the center compartment and compartment 1
The oil level in the sliding door drive can be determined through the
Level gauge
Dipstick
Sight glass
Oil refilling point
The purpose of the bypass valve in the sliding door dive is the allow the
Sliding door to rotate
Universal shaft to rotate freely,
Hydraulic oil to flow in the system.
Pushing of the sliding door without dismantling the universal shaft in the event of power failure.
To provide flexibility for any misalignment in mounting a ______ drive shaft is used in the sliding door drive
Universal
One-way rotation
Ball-joint
Heavy duty flexible
The planetary reduction gear in the sliding door drive has the advantage small in size, compactness and _______
Minimum maintenance
Low cost
Easily installed and adaptable to any fixtures
Can be operate in adverse condition
In the Hinge door system, what is the hydraulic fluid used?
Tellus 37
TX 30
Mobile Heavy Medium Oil
Aeroshell Fluid 41
Water can be distributed to various users in the airbases through
Direct feed from PUB source and through storage tanks
From the reservoir
Direct feed from PUB source only
Storage tank only
How many types of water networks are there in an airbase?
1
2
3
4
The water distribution can also be in a ______ line network or a _______ line network
Double / Triple
Triple / Quadruple
Single / Double
Single / Multi
Water delivered from the source in a single line network is meant to be
Non- potable
Firefighting only
Cleaning of equipments only
Potable
Hydrants in a single water network will have the _______ pressure from the source.
Same
Different
Lower
Higher
Which critical facilities in the airbases needed to boost up the pressure in a single line network system for firefighting purpose?
Powerhouses
Airfield Control Center
Fire Pump houses
Base Command Post
What is the main difference between a single line water network and a double line water network?
Same line as the hydrant network for firefighting purposes.
Separate dedicated line for the hydrant network for firefighting purposes.
Same line as the PUB source for firefighting purposes
There is no difference.
What is the disadvantage when taking water direct from the supply source only?
The water is potable
Once the source is disrupted there will be no water supply as there is no reduncancy
The water in non potable.
Extra cost is required to clean the water.
How many main components are there in a water reticulation system in an airbase?
1
2
3
4
What are the 3 main components in a water reticulation system?
Powerhouse, firepump house, hydrants
Sprinkler, Foam system, fire alarm panel
Break tank, Transfer pump house, elevated tank.
Break tank, transfer pump house, fire pump house.
Which of the following describes the water supply from source to the airbases?
PUB to transfer pump house to break tank pump house
Transfer pump house to break tank pump house to PUB storage tanks.
Break tank pump house to PUB to Storage tanks at Transfer pump house.
PUB to break tank pump house to storage tanks at transfer pump house.
The operation of the break tank pump system is dependent on the water level in the ________ and the water level in its own ________.
Break tank, concrete tank
PUB tanks, break tank
Elevated tank, fire pump houses
Concrete tank, break tank
The transfer pump house houses
Concrete tank, transfer pumps and the chlorinating system.
Fire pump house, PUB tanks and the concrete tank.
PUB tanks, chlorinating system and the concrete tank.
Fire pump house , chlorinating system and the concrete tank.
How many compartements are there in a concrete tank?
1
2
3
4
What is the chlorinating system used for?
Prevent air escaping from storage tanks
Prevent water leaking out of the storage tanks
Detect pressure loss in the water pipeline
An automatic dosing system that senses the chlorine level in the stored water and introducing a controlled amount of chlorine to the tank when necessary.
The transfer pumps works on an alternate duty cycle and its purpose is to
Pump water to the sprinklers for firefighting purposes.
Transfer water to the fire pump houses.
Pump the stored water to an elevated tank for distribution to users through gravitational feed.
Pump water from PUB source to the concrete tanks.
The tanks are connected by a _________ which can be isolated for tank maintenance.
Fibre reinforced pipe
Balancing pipe
Steel pipe
Copper pipe
How many types of fire pump houses are there?
1
2
3
4
What are the types of fire pump houses?
Water distribution only or water distribution with chlorinating system
Water distribution system only or both water distribution and foam distribution systems for firefighting capabilities.
Foam distribution only or water distribution with chlorinating system.
Foam distribution only or foam distribution with chlorinating system.
How many types of pumps are there in a fire pump house?
1
2
3
4
Which is the critical facility in an airbase provides power backup supply during a power interruption of failure?
Powerhouse
Fire pump house
Base command post
Airfield control center
Which of the following components is part of the powerhouse system?
Jockey pump
AP300 Control system
Constant Current Generator
Electric Driven Pump
How many generators are there in a powerhouse to provide 24000KW?
1
2
3
4
Which of the following provides auto start functions to supply emergency power automatically in the event of a power failure?
Load Paralleling
Load Monitoring
Protective devices
AMF function
Which of the following enables the three generators to be paralleled together automatically without the need of manual supervision or adjustment?
Load Paralleling
Load monitoring
Protective devices
AMF function
Which of the following shuts down or starts up the generator as determined by the load demand. This will avoid running the generator too close to its limit or running it on too light a load.
Load paralleling
Load monitoring
Protective devices
AMF function
Which of the following protects the system from a fault. Unit will shut down in the event of a mechanical fault in the engine or an electrical fault in the system?
Load paralleling
Load monitoring
Protective devices
AMF function
The entire system works on a ________ voltage bus taken from a charged/standby power pack.
24VAC
24VDC
12VDC
230VAC
Which of the following component is used to produce electricity [Voltage/ Amps] with the cutting of magnetic flux?
Diesel engine
Radiator
Alternator
Automatic Voltage Regulator
Which of the following equipment is the mechanical prime mover for the system to drive the alternator by converting mechanical energy to electrical energy?
Diesel engine
Radiator
Alternator
Automatic Voltage Regulator
Which of the following component is used to cool the internal parts of the engine when it is running?
Diesel engine
Radiator
Alternator
Automatic Voltage Regulator
The engine speed control consists of how many main components?
1
2
3
4
What are the main components for the engine speed control?
Magnetic Pickup, Electronic Governor control unit, actuator magnetic pick up
Diesel engine, radiator alternator
Load parralleling, load monitoring, protective devices
Governor control unit, actuator, alternator
Which component does the electronic governor control unit sense the pulse signal from?
Electronic governor control unit
Magnetic pickup
Actuator
Automatic voltage regulator
Which is the operating speed of the generator in a powerhouse
3000rpm
2500rpm
2000rpm
1500rpm
Which of the following components are in an alternator?
Magnetic Pickup, electronic governor control unit, actuator magnetic pick up
Diesel engine, radiator, alternator
Laminated stator core, main rotor, exciter, automatic voltage regulator(AVR)
Load Parralleling, load Monitoring, Protective devices
What is the primary function of the automatic voltage regulator for a generator in a powerhouse?
It senses the pulse signal from the magnetic pickup and compares it with that of the pre-set frequency reference oscillator.
It compares the voltage signal from the alternator output to the voltage setting on the 'set volt' control. Any difference will be sensed and a correct current will be sent of the alternator will be maintained sensibly constant.
It is the main electrical component of the generating set. It is a 4 pole machine and is driven to the rated speed of 1500 rpm by the engine
It provides auto-start functions to supply emergency power automatically in the event of a power failure.
What is the seconday function of the automatic voltage regulator for a generator in a powerhouse?
It compares the voltage signal from the alternator output to the voltage setting on the 'set volt' control. Any difference will be sensed and a correct current will be sent of the alternator will be maintained sensibly constant
It provides auto-start functions to supply emergency power automatically in the event of a power failure
It is the main electrical component of the generating set. It is a 4-pole machine and is driven to the rated speed of 1500 rpm by the engine.
To reduce the quadrature component of voltage (quadrature droop) during paralleling so that reactive power is shared equally by the paralleled sets.
How many underground tanks are there outside a powerhouse?
1
2
3
4
Which type of fuel is used by the generators in a powerhouse?
Petrol
Gasoline
Diesel
Jet Fuel
What must be done before carrying our servicing on the generators at powerhouse?
A danger sign must be placed
A 'out of bounds' sign must be placed
A warning plate advising personnel that the plant may stat automatically without warning and to don on ear protectors must be prominently displayed.
Cover your ears with your hands as the generators may start without warning.
The primary function of the jet fuel station is to
Provide temporary storage
Receive jet fuel from commercial bridger
Deliver to aircraft using browser when required
All the above
What is not the general precaution when handling jet fuel?
Avoid breathing the vapour
Maintain adequate ventilation
Avoid contact with skin, eye and clothing
Induce heat
When jet fuel comes in contact with eyes,
No treatment is required as it is harmless
Flush the affected area with alkaline solution
Flush the affected area with plenty of water for at least 15 min
Remove victim away and allow more fresh air to dry the affected area
Which of the following is not the general layout of jet fuel station?
POL store
Storage tank
Receiving building
Network of pipelines
The loading rack allow the maximum fuel loading capacity of _________ per island.
200 GPM
300GPM
1200GPM
50000GPM
What is the storage tank capacity?
50 000 litres
1.0 million litres
1.5 million litres
2.0 million litres
How many sump(s) are there in the storage tank?
1
2
3
4
The control building is a hardened structure located at the corner of JFS which accommodates
All fuel discharge points for fuel transfer purposes
Bulldozer, rollers and heavy vehicles fro runway repairs
Pneumatic, hydraulic and electrical devices to support JFS
Electrical equipment, control panels and monitoring devices
The equipment installed in the receiving building is designed to
Purge out all unwanted sewerage waste
Receive leaded or unleaded petrol for aircraft usage
Handle fuel in the JFS, under normal delivering conditions
Withstand radio shockwave frequency from jamming the receiving operation
Which of the following protective measures is not equipped in the receiving building?
Escape hatch
Fuel fume detection
Forced air ventilation
Subsoil water table alarm system
To minimize sparks from static electricity during loading or unloading operations,
The trucks static discharges should removed before operation
The truck static discharges should be removed before operation
Ensure ventilation fans are strong enough to blow all static discharges
The trucks should be electrically bonded with bonding cable before operation begins
The fume detector is installed to
Prevent air escaping from storage tanks
Prevent water leaking out of the storage tanks
Detect water moisture presence in the jet fuel station
Detect the presence of jet fume level in the filtering building
The term "subsoil" is referring to the
Unwanted soil after a chemical process
First layer of soil beneath the soil surface
Alarm system incorporated in the water tanks
Drainage system below the sump of the fuel storage tanks
The purpose of the subsoil is to
Absorb spillage of fuel during fuel transfer
Allow excess water contaminants to bypass it
Vent fumes that reaches a pre-determined level
Eliminates water pressure against the wall of the storage tanks
What happens when the water pressure against the wall of the storage tanks is not eliminated?
The wall cracked under pressure
Water will overflow out of the tank
Subsoil system will ceased to function
Tanks pressure will increased and the wall hardened to absorb vibration
The basket type strainer installed in the receiving building has a filtering capacity of removing __________ of soil contaminants.
5 mesh
10 mesh
20 mesh
40 mesh
Pressure gauges are installed before and after a strainer to
Determine flow rate in the pipeline
Check accuracy of each gauge
Provide differential pressure reading across the strainer
None of the above
The slop tank, which is located at a low point of the JFS topography is used for
Pure refined fuel only
Fuel with ASA 3 additive only
Fuel with Dupon 450 additive only
Containing waste or unwanted fuel
Incorporated in the slop tank are
Hardened bomb shelters
Two reserve tanks for emergency purposes
Its own slop pump system and a filtering unit to separate impurities
All the above
All pipelines are normally pressurized to prevent
Water from draining away
Explosion and fume leakage
Corrosion and material fatigue
Condensation and air log in the system
The function of the fuel storage tank is to
Store and segregate waste fuel to JFS
Store fuel and dispense the fuel delivered to JFS
Receive raw fuel from underground and refine it to JFS
Drain away unwanted fuel and delivered to JFS for filtering
The bottom slope towards the center sump in the tank is
4 degrees
6 degrees
10 degrees
30 degrees
What is the maximum fuel discharge rate of the sump pump under emergency condition (utilizing generator power)?
30 GPM
50 GPM
75 GPM
100 GPM
What is the precaution to note when manually draining a strainer or a filter separator?
Open the drain valve slowly
Open the drain valve for at least 30 seconds
Do not operate the drain valve without supervision
Turn the drain valve in anti-clockwise direction only
When using the batch controller for refuelling, the following detail are required to key in except
Aircraft tail number
User id
Quantity in litres
Date and time
For the batch controller, 'no flow' alarm come on when zero flow occurs for
15sec
30sec
45sec
60sec
Which of the following component is not found in the compartment pantograph system of a parking dispersal site?
Filter water separator
Digital control valve
Coupler nozzle
Pressure reducing valve
Which of the following is not safety mechanism for pantograph system?
Fusible link valve
Bonding reel
Massflow meter
Deadman switch
Which of the following regulate the pressure of the pantograph to stay within the safety range during refuelling
Digital control valve
Pressure reducing valve
Massflow meter
Batch controller
How many filtration process in total when fuel supply from jet fuel station storage tank to aircraft?
1
2
3
4
The sump pump is installed underground for the purpose of
Storing water for drinking during wartime
Transferring unwanted water and residue to the ground level drain system
Storing excess oil for machine and equipment during tension period.
Cooling up the system by pumping stored water from the sump pump.
Which of the following is not true about the water storage
The water is used for consumption during peace and wartime
Water tank must always be filled up during wartime
The water is supplied from the PUB directly.
There are 2 electric water pumps and a manual pump
Which of the following is not true about the disinfection device
Lnvolves ultra violet rays instead of liquid agents
The water taste may vary depending one the amount of disinfectant used.
water in the hydro pneumatic tank can last for as long as a week.
The disinfection process does not improve the taste of the water.
Blast valves(BVs), which are cast into the concrete wall, are to stop ________from entering into the shelter.
Atmospheric pressure
Blast pressure
Water pressure
Contaminated air
In the event of an electrical power failure, the ventilation unit (VU) is ___________.
Unserviceable
Serviceable using standby power source
Able to work manually with crank handle
None of the above
Over pressure valve (OPVs), are installed along the exhaust air paths. Every opv has swing disc to ___________.
Stop internal pressure from escaping
Create sound to indicate shelter is being pressurised
Stop the blast pressure
Regulate the air pressure
Manometer has two connection ports, to be terminated at each side of the wall to measure __________.
Temperature
Humidity
Toxic fumes
The pressure differential across
What is required to cast in the wall at location where multiple cables or pipes need to penetrate the wall that require airtight sealing?
Multi-cable transit (MCT) frames
Cable duct
Multi-transit cable (MTC) frames
Cable bushing
The total built-up pressure within the shelter is the summation of individual readings. The total built-up pressure shall not be less than _________.
30 pa
40 pa
50 pa
60 pa
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