Air Brake System Classification and Components

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Questions and Answers

What are the two classifications of air brake systems based on the type of release?

Direct and Graduated (correct)

Forward and Reverse

Single and Twin

Automatic and Manual

Which of the following components is NOT part of a single pipe graduated release air brake system?

Brake cylinder

Pressure gauges

Distributor valve

Speedometer (correct)

What is the role of the auxiliary reservoir in the single pipe graduated release air brake system?

To house the isolating cock

To collect dirt particles

To measure system pressure

To charge through the distributor valve (correct)

In a single pipe graduated release air brake system, which angle cocks are generally kept open?

Only the front and last vehicle angle cocks Signup and view all the answers

Which of the following is a feature of the recently introduced Bogie mounted Brake System (BMBS)?

It is detailed in Para 729 of this chapter Signup and view all the answers

At what pressure is the auxiliary reservoir charged through the distributor valve in a single pipe graduated release air brake system?

5.0 kg/cm2 Signup and view all the answers

What is the purpose of the compressed payout spring in the slack adjuster mechanism?

To push the adjuster nut under rotation Signup and view all the answers

Which tool is specifically designed for the maintenance of slack adjusters?

Jacking tool Signup and view all the answers

What is the diameter of the brake cylinder used in the single pipe graduated release air brake system?

300 mm and 355 mm Signup and view all the answers

At what point should the slack adjuster be overhauled?

At the time of POH of rolling stock Signup and view all the answers

Which tool is not required for the overhauling of slack adjuster?

Electric drill Signup and view all the answers

What should be done with worn out parts during the maintenance of the slack adjuster?

Check according to specified limits Signup and view all the answers

What is the first step in the procedure for testing the hose coupling?

Use a dummy coupling head to block the outlet port. Signup and view all the answers

After adjusting the pressure gauge to 10Kg/cm2, what is the next step?

Open isolating cock 1(b) and check gauge 6b. Signup and view all the answers

What should be done if leakage is observed after changing the gasket on the coupling head?

Replace the entire coupling assembly. Signup and view all the answers

Which safety precaution should be taken before charging the testing system to 10Kg/cm2?

Cover and lock the tube with a protective cage. Signup and view all the answers

What must be done after testing the hose assembly?

Store it in a dry and clean space. Signup and view all the answers

What should be checked using gauge 6b after opening isolating cock 1(b)?

The pressure displayed, which should show 10Kg/cm2. Signup and view all the answers

If leakage occurs at the hose nipple, what step should be taken?

Check and replace the clamp. Signup and view all the answers

Which of the following is NOT a safety precaution listed for testing the hose coupling?

Always test with a protective rubber cover. Signup and view all the answers

What could indicate that the coupling head is unserviceable?

Water leaks through the coupling head after a gasket change. Signup and view all the answers

What is the purpose of incorporating a push rod in the piston sub assembly?

To accommodate minor variations in alignment during fitment and operation Signup and view all the answers

Which tool is NOT mentioned as necessary for overhauling the brake cylinder?

Adjustable Wrench 10-15 mm Signup and view all the answers

What is the main reason for thoroughly overhauling the brake cylinder?

To ensure efficient and reliable performance throughout its service life Signup and view all the answers

What should be done before dismantling the dome cover of the brake cylinder?

Insert a rounded head pin to secure the piston trunk Signup and view all the answers

During the dismantling process, which component is removed first?

Return spring Signup and view all the answers

What is the function of the special fixture during the dismantling of the brake cylinder?

To clamp the dome cover securely Signup and view all the answers

Which part is separated from the piston rod during the unscrewing process?

Piston ring packing Signup and view all the answers

Which of the following is a characteristic of the brake cylinder described in the content?

It must conform to specific dimension tolerances Signup and view all the answers

What sequence occurs after the dome cover is unclamped?

Allow the return spring to expand fully Signup and view all the answers

Which tool would be used for unscrewing the hexagonal head nut on the dome cover?

Double End Spanner across face 13x14 Signup and view all the answers

What should be done if a ball of the valve has dents or scratch marks?

It should be replaced with a new one. Signup and view all the answers

Which component is placed in its position in the bore of the body before inserting the ball?

Seat ring Signup and view all the answers

What pressure is the inlet port charged with during the testing of the guard's emergency brake valve?

10 Kg/cm2 Signup and view all the answers

What is the purpose of the slack adjuster in the brake rigging?

To automatically adjust the clearance between brake blocks and wheel. Signup and view all the answers

What is the first step after overhauling and fixing the valve to the test bench?

Put the handle of the valve in the off position. Signup and view all the answers

What is tested during the assembly of the quick coupling arrangement?

Leak-proof integrity up to 10 kg/cm2 air pressure. Signup and view all the answers

Which of the following components is not mentioned in the details of part numbers for the quick coupling arrangement?

Threaded plug Signup and view all the answers

What must be used to ensure that the gland is secured to the valve body?

A spring washer and nut Signup and view all the answers

What happens when the handle of the guard's emergency brake valve is moved to the open position?

Air escapes through the vent of the valve. Signup and view all the answers

What type of adjustment does the slack adjuster perform in the braking system?

Automatic adjustment. Signup and view all the answers

What is the maximum allowable leakage in the brake system per minute?

0.25 kg/cm2 Signup and view all the answers

In what position should the handle of the isolating cock be when it is open?

Vertical down Signup and view all the answers

What should be ensured regarding the feed pipe hose coupling in a train?

It should form a continuous passage from locomotive to last vehicle. Signup and view all the answers

Which of the following is prohibited regarding the angle cocks in a train?

Closing them for wagon isolation under any circumstance Signup and view all the answers

What must be ensured about the feed pipe pressure in the locomotive and brake van before a train leaves?

It must be equal to or greater than 5.8 kg/cm2 Signup and view all the answers

What is the consequence of allowing a feed pipe to connect to the brake pipe?

It can cause failure of the brake system. Signup and view all the answers

Which item is specifically mentioned for the quick coupling arrangement?

Air brake hose coupling Signup and view all the answers

What feature distinguishes the construction of the auxiliary reservoir in the air brake system?

Cylindrical shape made of sheet metal with flanges for connections Signup and view all the answers

Which of the following steps is NOT part of the cleaning procedure for the auxiliary reservoir?

Applying high-pressure steam cleaning to the interior Signup and view all the answers

What must be replaced if the threads of the drain plug in the auxiliary reservoir are damaged?

The drain plug itself Signup and view all the answers

What specific task is required before the auxiliary reservoir is charged with air?

Unscrewing the drain plug to remove water Signup and view all the answers

During maintenance, what should be done if pitting or rusting is observed on the auxiliary reservoir?

Use a wire brush to clean the affected area Signup and view all the answers

What is the first action to be taken when testing the hose coupling?

Connect the hose coupling to the flexible hose. Signup and view all the answers

After adjusting the pressure gauge to 10Kg/cm2, which step is taken next?

Immerse the assembly in water. Signup and view all the answers

What should be done if there is leakage observed after changing the gasket on the coupling head?

Replace the entire hose assembly. Signup and view all the answers

Which safety precaution must be taken before charging the testing system to 10Kg/cm2?

Cover and lock the tube with a cage. Signup and view all the answers

If leakage occurs at the hose nipple or coupling end hose joint, what is the appropriate response?

Attend to or replace the clamp. Signup and view all the answers

What should be included in the storage process of the hose assembly after testing?

Store it in a dry and clean space. Signup and view all the answers

What is indicated by a failure of the coupling head to stop leakage even after a gasket replacement?

The coupling head may be unserviceable. Signup and view all the answers

Which step directly follows the observation of leakage from the testing procedure?

Close isolating cock 1(b). Signup and view all the answers

What must be done to the inlet and outlet ports after testing the hose assembly?

Plug them with protective caps. Signup and view all the answers

What is the purpose of the pressure reducing valve in the brake cylinder test bench?

To limit the pressure supplied to the brake cylinder. Signup and view all the answers

During the strength test, what pressure should be achieved in the pressure gauge after opening cock (2)?

6 Kg/cm2 Signup and view all the answers

What is the first step required to check for air leaks over the body and joints?

Use a soap solution to check for leaks Signup and view all the answers

Which tool is recommended for adjusting torque when working on brake cylinder components?

Torque wrench (2-3 kgM) Signup and view all the answers

What is the significance of waiting for 2 minutes after closing cock (2) during the strength test?

To ensure the pressure stabilizes and leaks can be detected. Signup and view all the answers

What action should be taken immediately after reducing the pressure in the main reservoir to 5 kg/cm2?

Close cock (1f) Signup and view all the answers

What does the safety guard do during the testing of the brake cylinder?

It protects operators from high-pressure failures. Signup and view all the answers

Which condition indicates that the filter is choked during the pressure check?

No air flowing from the outlet port Signup and view all the answers

How is the brake cylinder stroke adjusted before conducting tests?

Set at 85 + 10 mm. Signup and view all the answers

What should be done to prevent damage to the flange surface during maintenance?

Use protective caps for inlet and outlet ports Signup and view all the answers

What is a recommended practice for handling small metal parts during maintenance?

Keep them in a secured place Signup and view all the answers

What component is essential to ensure the brake cylinder operates correctly during testing?

Air reservoir. Signup and view all the answers

During the testing process, what should be monitored for a duration of three minutes?

Pressure drop in gauge 6c Signup and view all the answers

Which procedure is essential before dismantling the brake cylinder?

Draining any residual air pressure. Signup and view all the answers

What is the purpose of checking the free flow of air from the outlet port?

To ensure the filter is functioning properly Signup and view all the answers

What action should be taken if leakage is observed during the pressure tightness test?

Tighten all bolts and fittings, then retest. Signup and view all the answers

Which component must be connected to the brake cylinder for it to function correctly on the test bench?

An air supply line. Signup and view all the answers

What should be done if a gauge shows an unexpected pressure drop during testing?

Inspect for possible leaks or blockages Signup and view all the answers

What is the necessary step after removing the dummy flange from the outlet port?

Check the flow and quality of air Signup and view all the answers

What happens if the assembled dirt collector is not stored appropriately?

The parts may become misaligned or damaged Signup and view all the answers

Study Notes