RAC
As the engine speed decreases, the cooling capacity of the car AC system
- increases
- Remains unchanged
- Decreases
- May increase or decrease depending on number of persons travelling in car
The AC of a car Air-conditioning system can be regarded as
- Direct expansion system
- Indirect expansion system
- Both direct and indirect expansion
- Neither direct nor indirect expansion
What is measured by a gauge manifold in automobile air conditioner?
- Evaporator pressure only
- Condenser pressure only
- Both mass flow and refrigerating effect
- Both evaporator and condenser pressure
of car air conditioner allows a full range of blower speeds from full, fast, too slow?
- Magnetic clutch
- Thermostat
- Fuse
- Rheostat
What is the purpose of adding dye to the car A.C. system?
- Shine the car
- Lubricate the engine
- Adding performance
- Identify the gas leak
Air refrigeration cycle is used in–
- domestic refrigerator
- aircraft refrigeration system
- commercial refrigerator
- all of these
The manually cleaned type of filter has–
- plastic frame
- metal frame
- cloth frame
- none of these
The ..——— of oil can be properly controlled by the force feed lubrication.
- distribution
- travel
- speed
- flow
The cooling system used in air-craft cooling is–
- vapor compression system
- vapor absorption system
- air cycle refrigeration system
- steam jet refrigeration system
The purpose of automobile air-conditioning is to produce comfort in the passenger chamber by controlling–
- temperature and pressure
- temperature and humidity
- humidity and pressure
- temperature, humidity and pressure
From which component is the compressor of allduth car AC connected to?
- From the radiator of car
- From the engine of car
- From the wiper of car
- None of the above
The free wheeling technique is used in car AC System–
- evaporator
- compressor
- condenser
- receiver
The key points in maintenance of car AC is–
- make sure to use the car AC at least once in a week
- operate the car AC on defrost mode to protect it from moisture
- flush the radiator of car AC at fixed time period anton
- all of these
The component will two members used to save energy in a car AC is–
- magnetic clutch
- free wheeling
- drier
- evaporator
Why is the car AC operated in winter?
- To control the temperature of the car
- To reduce the humidity inside the cabin of a car
- To control the air in the car
- All of these
The possible causes failure of car AC is–
- loose belt
- magnetic clutch is not pressed properly
- thermostat valve is not functioning
- tight connection of AC
The condenser used in a car AC is generally made of which metal?
- Silver
- Copper
- Aluminium
- Tin
Which lubrication oil is recommended for R-134A car AC system?
- Automobile oil
- Mineral oil
- Camphor oil
- POE oil
The compressor of the car Air-conditioning system gets the drive from–
- solar panels
- car battery
- generator car
- I.C. engine
The condenser of a car AC is–
- water cooled
- air cooled
- evaporative type
- none of these
The upcoming alternative refrigerant to be used in car air-conditioning system is–
- R134a
- R1234yf
- R1234ze
- R764W
Where is the AC located in the car?
- At the rear side
- In the front side
- On the roof
- All of these
The component used to trigger compressor in a car AC is–
- magnetic clutch
- condenser
- evaporator
- air filter
Where is the thermostat fitted in car AC?
- Near the engine
- On the roof
- In the passenger compartment unit
- On back side
Which of the following is controlled by car AC?
- Temperature
- Humidity
- Air cleanliness
- All of these
The unit to measure the flow of air in car AC is–
- RPM
- KMH
- CFM
- PSI
The part of electrical circuit of car AC is–
- compressor
- thermostat
- battery
- all of these
Possible reason for less air flow in automobile A.C. is–
- ventilation fan not working
- air blower not working
- blocked air inlet port
- all of these
Instead of air unit operating in automobile A.C. what could be probable reason of failure in cooling process?
- Thermostat not working
- Blockage in condenser
- Reduced refrigerant level
- All of these
Where was the car A.C. used for the first time?
- USA
- China
- India
- France
Where the battery negative terminal is connected in auto A.C.?
- A.C. relay
- Ground
- Blower motor
- Ignition switch
Possible reasons of obtaining polluted air in car is–
- malfunction in air filter
- reduction in quantity of refrigerant
- leakage
- none of these
Possible reason for less cooling in automobile A.C. is–
- malfunction in air filter
- reduction in quantity of refrigerant
- leakage
- both (b) and (c)
Automobile A.C. depends on the following Surfactor(s)
- speed of the car
- number of people sitting in the car
- both (a) and (b)
- none of these
Components used in automobile A.C. is–
- compressor
- condenser
- evaporator
- all of these
Which component, with respect to engine is used to control the compressor of car A.C.?
- Magnetic clutch
- Free wheeling
- Drier
- Expansion valve
Fuel consumption in automobile A.C. can be reduced by–
- reducing the speed of the car
- increasing the speed of the car
- a lot of people are sitting
- all of these
In which vehicle was the automobile A.C. first used?
- Car
- Bus
- Truck
- Train
Which part of A.C. system is placed near automobile radiator?
- Evaporator
- Condenser
- Compressor
- Air blower
At high speed of engine, AC system will generate–
- heat
- over cooling
- cooling
- none of these
Automobile A.C. compressor is operated through–
- radiator
- engine
- wheels
- all of these
Which components of A.C. are present near the engine of automobile A.C.?
- Condenser
- Compressor
- Both (a) and (b)
- Evaporator
Which part of A.C. is installed near cabin of automobile?
- Condenser
- Compressor
- Both (a) and (b)
- Evaporator
Which of the following is hot compressed refrigerant receives and cools it?
- Dehydrator
- Condenser
- Evaporator
- Throttle valve
Which refrigerant in automotive air conditioning is used for?
- Ammonia
- Carbon dioxide
- Freon
- Brine
Which of the following is a component of a refrigerant flows on a component, where it 400 completely receiver drier?
- Expansion valve
- Condenser
- Compressor
- Evaporator
The chemical formula of freon used in automobile air conditioning is–
- CCl2F2
- CCIF2
- CCl₂F
- CCIF
3 ton capacity air conditioning equivalent to it happens
- 9702 kcal/hr
- 9270 kcal/hr
- 7092 kcal/hr
- 9072 kcal/hr
Which of the following removes the moisture particles present in the air conditioning system so that freezing of moisture does not occur at low temperature?
- Condenser
- Dehydrator
- Evaporator
- Expansion valve
When refrigerant suddenly expands at very low pressure so what is the reason for this?
- Heating effect
- Cooling effect
- No effect
- Very little impact
Conventional petrol by turning on the air conditioner fuel economy of the engine is approx. Decrease by 20% when you use the air conditioner in a hybrid gas-electric vehicle so what happens?
- It has almost the same effect
- There is less loss of gas mileage
- There is greater loss of gas mileage
- Has no effect on gas mileage