Air Conditioning in Railway Coaches
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Questions and Answers

What is one of the main environmental challenges faced in railway air conditioning?

  • Excessive humidity in the coaches.
  • Dusty atmosphere. (correct)
  • Frequent snow in winter.
  • Consistent high temperatures.

    • Why is the reliability standard for railway air conditioning equipment particularly high?

  • The equipment operates using industrial power.
  • Equipment failure can lead to passenger discomfort. (correct)
  • The coaches are lightweight.
  • Equipment must be able to withstand heavy vibrations.

    • What temperature range needs to be accommodated by the railway air conditioning system?

  • 0 degree C to 50 degree C.
  • 5 degree C to 30 degree C.
  • 2 degree C to 46 degree C. (correct)
  • 10 degree C to 40 degree C.

    • What is a special feature of the air conditioning systems in Indian Railways' upper-class coaches?

    <p>Introduction only for upper-class travelers.</p> Signup and view all the answers

    What factor can lead to sudden temperature changes affecting passengers in a train?

    <p>High speed of the train.</p> Signup and view all the answers

    What power supply is primarily utilized for air conditioning in railway coaches?

    <p>110V D.C.</p> Signup and view all the answers

    What is one of the requirements for the railway coach air conditioning system related to air quality?

    <p>Supplying clean fresh air.</p> Signup and view all the answers

    What type of air-conditioning systems are used in coaches with a full AC configuration?

    <p>Double compressor with a 5F30 refrigerant</p> Signup and view all the answers

    What is the approximate refrigerant capacity for a single compressor system in a full AC coach?

    <p>1x15 kg</p> Signup and view all the answers

    What is included in the POH recommended standard facilities for air-conditioned coaches?

    <p>A receiving shed with a 1.35 M width pit</p> Signup and view all the answers

    How often are air-conditioned coaches typically subjected to a maintenance schedule?

    <p>Every month</p> Signup and view all the answers

    What is the purpose of the layout in a POH shop for AC coaches?

    <p>To facilitate unloading/loading of equipment efficiently</p> Signup and view all the answers

    What component controls the quantity of high pressure liquid refrigerant in the evaporator unit?

    <p>Thermostatic expansion valve</p> Signup and view all the answers

    What is the primary function of the condenser in the refrigeration system?

    <p>To extract heat from the refrigerant vapour</p> Signup and view all the answers

    What percentage of fresh air is mixed with return air in the evaporator unit?

    <p>25%</p> Signup and view all the answers

    What is the pressure range to which refrigerant vapor is compressed in the compressor?

    <p>10 to 15 Kg/Cm2</p> Signup and view all the answers

    What happens to the refrigerant as it passes through the heat exchanger in the evaporator unit?

    <p>It cools the air and evaporates</p> Signup and view all the answers

    What role do filters serve in the evaporator unit?

    <p>Eliminate dust</p> Signup and view all the answers

    What mechanism is used to cool the condenser?

    <p>Axial flow impeller fans</p> Signup and view all the answers

    What initiates the activation of the heater when ambient temperatures are low?

    <p>Thermostat settings</p> Signup and view all the answers

    What type of compressor is used in the refrigeration system mentioned?

    <p>Multi cylinder reciprocating compressor</p> Signup and view all the answers

    What should the suction pressure of the compressor not be lower than to prevent frosting of the evaporator?

    <p>0.7 Kg/Cm2</p> Signup and view all the answers

    What is required for the compressor motor to prevent an excessive rush of starting current?

    <p>Soft start</p> Signup and view all the answers

    Which type of air duct is not separately provided in A/C coaches?

    <p>Return air duct</p> Signup and view all the answers

    What is the function of the damper valve in the fresh (inlet) air duct?

    <p>To control the quantity of fresh air</p> Signup and view all the answers

    What type of protection is provided for all electrical circuits in the A/C system?

    <p>Overload and short circuit protection</p> Signup and view all the answers

    What voltage level is the compressor motor protected from dropping below?

    <p>100 volts</p> Signup and view all the answers

    Where are the return air filters located in a 1st class A.C. coach?

    <p>In the corridor ceiling</p> Signup and view all the answers

    What ensures that the heater is not powered on when the compressor is working?

    <p>An interlock system</p> Signup and view all the answers

    How many fresh (inlet) air ducts are provided per AC plant?

    <p>Two</p> Signup and view all the answers

    What component is essential for preventing excessive pressure on the discharge side of the compressor?

    <p>High head pressure safety valve</p> Signup and view all the answers

    What material is used for all terminal boards to enhance fire safety?

    <p>FRP</p> Signup and view all the answers

    Which types of thermostats are currently being replaced by electronic thermostats?

    <p>Mercury in glass thermostats</p> Signup and view all the answers

    What is the primary function of the crimped type of connections used in wiring?

    <p>To provide a secure connection</p> Signup and view all the answers

    What is the cooling temperature set at for the electronic thermostat?

    <p>24°C</p> Signup and view all the answers

    In the air conditioning system, what does the 'TR' stand for in capacity ratings?

    <p>Tonnage Rating</p> Signup and view all the answers

    How many types of thermostats are used for controlling the air conditioning system's temperature?

    <p>Two</p> Signup and view all the answers

    How are the cables for the air conditioning system maintained?

    <p>Laid on steel troughs/conduits</p> Signup and view all the answers

    Which of the following coach types has the highest air conditioning capacity?

    <p>B.G.AC chair car</p> Signup and view all the answers

    What type of material are the copper cables insulated with?

    <p>PVC</p> Signup and view all the answers

    What does the temperature control for heating use as a setting in the air-conditioned compartment?

    <p>21°C</p> Signup and view all the answers

    What is the refrigerant capacity range for a full AC coach with one compressor?

    <p>5 to 9 kg</p> Signup and view all the answers

    What is the specified pit width for the receiving shed in the recommended facilities for POH of AC coaches?

    <p>1.35 M</p> Signup and view all the answers

    Which of the following maintenance schedules is NOT part of the maintenance routine for air-conditioned coaches?

    <p>Daily schedule</p> Signup and view all the answers

    What is the total out-turn capacity of coaches per month recommended for the POH shop?

    <p>5 coaches</p> Signup and view all the answers

    What equipment unloads from a coach is moved to the respective sections of the shop by?

    <p>Mechanised transport facilities</p> Signup and view all the answers

    What type of motor is used in E.O.G. type coaches for driving AC equipment?

    <p>Squirrel cage induction motor</p> Signup and view all the answers

    Which of the following battery specifications applies to BG AC 1st class coaches?

    <p>1 set of 525 AH</p> Signup and view all the answers

    Which component is NOT typically included in the A/C equipment of railway coaches?

    <p>Air compressor</p> Signup and view all the answers

    What voltage is used for train lighting equipment in railway coaches?

    <p>110V</p> Signup and view all the answers

    What is the capacity of the battery set used in MG AC 2T sleeper coaches?

    <p>1 set of 450 AH</p> Signup and view all the answers

    What type of transformer is used to obtain the 110V AC supply from 415V?

    <p>Step down transformer</p> Signup and view all the answers

    What is a key feature of the driving motors used in self-generating type coaches?

    <p>Need more attention for commutator and brushes</p> Signup and view all the answers

    What is the capacity of the battery used in BG AC composite coaches?

    <p>1 set of 800 AH (56 cells)</p> Signup and view all the answers

    What is the typical number of sets and capacity of batteries for BG AC Chair Car coaches?

    <p>1 set of 800 AH</p> Signup and view all the answers

    What is the minimum full load output (MFO) speed required for the alternator in SG coaches to generate power?

    <p>50 km/h</p> Signup and view all the answers

    Which component is responsible for providing a power supply to the air conditioning system in EOG coaches?

    <p>Generator car</p> Signup and view all the answers

    What is the primary voltage output of the alternator in SG coaches?

    <p>130 V DC</p> Signup and view all the answers

    What is the role of the battery charger mounted on the coach under frame?

    <p>To charge the onboard battery</p> Signup and view all the answers

    How many alternator sets are typically fitted in self-generating type AC coaches?

    <p>One per AC plant</p> Signup and view all the answers

    What is the charging capacity of the onboard battery used in SG coaches?

    <p>800 AH</p> Signup and view all the answers

    What type of power supply do EOG coaches utilize for air conditioning?

    <p>Generator-driven AC power</p> Signup and view all the answers

    What role does the thermostatic expansion valve serve in the evaporator unit?

    <p>It controls the quantity of refrigerant and allows it to expand.</p> Signup and view all the answers

    What is the maximum pressure to which the refrigerant vapour is compressed by the compressor?

    <p>15 Kg/Cm2</p> Signup and view all the answers

    What mechanism is employed to cool the condenser in the refrigeration system?

    <p>Forced air cooling using impeller fans</p> Signup and view all the answers

    How does the air mixing percentage in the evaporator unit influence air conditioning efficiency?

    <p>75% return air mixed with 25% fresh air optimizes cooling.</p> Signup and view all the answers

    What is the primary purpose of the resistance heating unit in the evaporator?

    <p>To ensure air conditioning during low outdoor temperatures.</p> Signup and view all the answers

    What material is commonly used for the pipes in the heat exchanger within the evaporator unit?

    <p>Copper</p> Signup and view all the answers

    Which component is crucial for allowing the refrigerant to expand and control pressure before entering the heat exchanger?

    <p>Thermostatic expansion valve</p> Signup and view all the answers

    What function does the evaporator unit fulfill within an air conditioning system?

    <p>It evaporates the refrigerant and cools the air.</p> Signup and view all the answers

    What is the main objective of the filters used in the air paths of the evaporator unit?

    <p>To eliminate dust and pollutants from the air.</p> Signup and view all the answers

    What could potentially happen if the suction pressure of the compressor is lower than 0.7 Kg/Cm2?

    <p>Frosting of the evaporator may occur</p> Signup and view all the answers

    What is the purpose of having a soft start for the compressor motor?

    <p>To limit the sudden inrush of starting current</p> Signup and view all the answers

    Which safety feature ensures the heater does not operate while the compressor is functioning?

    <p>Protection interlock system</p> Signup and view all the answers

    Where are the return air filters located in a two-tier A/C coach?

    <p>Near the ceiling of the first compartment's corridor</p> Signup and view all the answers

    What type of protection is essential for the compressor motor to prevent low voltage scenarios?

    <p>Low voltage protection</p> Signup and view all the answers

    What is the specified rate of fresh (inlet) air ducts per AC plant?

    <p>Two ducts per AC plant</p> Signup and view all the answers

    What is primarily responsible for ensuring safety requirements in the A/C control panel?

    <p>Incorporation of all safety specifications</p> Signup and view all the answers

    Which type of air duct is utilized for drawing in fresh air?

    <p>Fresh (inlet) air duct</p> Signup and view all the answers

    What does the return air duct function primarily serve in the air conditioning system of A/C coaches?

    <p>To return air from the compartment back into the system</p> Signup and view all the answers

    Study Notes

    Air Conditioning of Railway Coaches

    • Passengers experience discomfort due to dust-laden air and variable temperatures (46°C in summer, 2°C in winter) in Indian trains.
    • Air conditioning is needed for passenger comfort.
    • Modern trains now include air conditioning for all classes.
    • Air conditioning in train carriages is more complex than in standard buildings.

    Special Problems

    • High reliability standards are required for equipment.
    • Equipment must be lightweight.
    • Equipment should take up minimal space.
    • Limited power supply (typically 110V DC), sometimes 415V, 50Hz, 3Ph, is available.
    • Flexibility for attaching and detaching coaches is reduced.
    • Limited space for air circulation due to numerous passengers.
    • Rapid temperature changes can cause discomfort.
    • Excessive vibrations are present.
    • Dust and vandalism are common.
    • Equipment is exposed to ballast debris.
    • Staff safety must be considered during maintenance.
    • Restricted maintenance time.
    • Problems need solutions that are practical and affordable

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    Railway Coach Air Conditioning PDF

    Description

    This quiz explores the complexities and challenges of implementing air conditioning in railway coaches, particularly in the Indian context. It covers the necessity for passenger comfort, the reliability requirements for equipment, and the unique operational challenges faced in train environments. Test your understanding of modern air conditioning systems in trains.

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