# Letp 1a Air Brake Knowledge Quiz

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Welcome to LETP 1A Air Brake Knowledge Quiz. Here you will find questions about the train's operating functions, such as the brake system. What do you know about cylinder pressure, safety valve, check valve, etc.? This quiz will test your knowledge of the topic. So, are you ready?

• 1.

### At what pressure is the safety valve on the discharge pipe set?

• A.

185psi

• B.

150psi

• C.

60psi

• D.

145psi

A. 185psi
Explanation
The safety valve on the discharge pipe is set at 185psi, which means that it will open and release excess pressure from the system when the pressure reaches or exceeds this level. This is important to prevent overpressure and potential damage to the equipment or system. It ensures the safety and proper functioning of the system by relieving pressure when it becomes too high.

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• 2.

### Which Main Reservoir receives air pressure first?

No. 1, No.1 main reservoir, Main reservoir No. 1, Number 1, Number 1 main reservoir, Main reservoir Number 1
Explanation
The explanation for the given correct answer is that the No. 1 main reservoir, Main reservoir No. 1, Number 1, Number 1 main reservoir, and Main reservoir Number 1 all refer to the same main reservoir that receives air pressure first.

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• 3.

### What type of checkvalve would be found between the main reservoirs?

non return checkvalve, non-return checkvalve
Explanation
The correct answer is "non return checkvalve, non-return checkvalve." This type of check valve is commonly used between main reservoirs to prevent the backflow of air. It ensures that air can only flow in one direction, allowing the main reservoirs to maintain their pressure and preventing any loss of air. The term "non return" or "non-return" indicates that the valve does not allow air to return in the opposite direction.

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• 4.

### At what PSI is the safety valve on the No. 1 Main Reservoir set?

• A.

145PSI

• B.

185PSI

• C.

150PSI

• D.

140PSI

C. 150PSI
Explanation
The safety valve on the No. 1 Main Reservoir is set at 150 PSI. This means that when the pressure in the main reservoir reaches or exceeds 150 PSI, the safety valve will open to release the excess pressure and prevent any damage or failure of the system.

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• 5.

### How is the air compressor driven?

Prime Mover Crank Shaft, prime mover crankshaft
Explanation
The air compressor is driven by the prime mover crankshaft. The prime mover crankshaft is responsible for converting the reciprocating motion of the pistons into rotary motion, which is then used to power the air compressor. This allows the compressor to draw in air and compress it, providing the necessary pressure for various applications.

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• 6.

### An initial reduction will remove about ________ PSI.

6, six
Explanation
An initial reduction will remove about 6 PSI.

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• 7.

### On passenger equipment, what is the brake pipe reduction during a full service application?

• A.

26psi

• B.

32psi

• C.

25psi

• D.

50psi

B. 32psi
Explanation
During a full service application on passenger equipment, the brake pipe reduction is 32psi. This means that the pressure in the brake pipe is reduced by 32 pounds per square inch. This reduction in pressure allows the brakes to engage and slow down the train. It is important to have a significant reduction in pressure to ensure that the brakes are applied effectively and the train can come to a stop safely.

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• 8.

### To release a GP40PH-2's brakes after an Emergency application has been made, how long must the AB handle be kept in Emergency?

• A.

Once a full stop has been made, the AB handle can be moved to Suppression

• B.

After the train has stopped, wait 30 seconds, then put the AB handle into Suppression

• C.

After the train has stopped, wait 8 seconds, then move the AB handle into Suppression

• D.

After the train has stopped, wait 1min, then put the AB handle into Suppression

D. After the train has stopped, wait 1min, then put the AB handle into Suppression
Explanation
After an Emergency application has been made, the brakes of a GP40PH-2 train must be released by waiting for 1 minute after the train has come to a complete stop, and then moving the AB handle into Suppression. This time delay allows for the proper release of the brakes and ensures the train is ready to resume normal operation.

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• 9.

### On passenger equipment, the CCS will close its contacts at ________psi and open the contacts at ________psi.

140, 130
Explanation
The CCS (Control Circuit Switch) on passenger equipment is designed to close its contacts at 140 psi and open the contacts at 130 psi. This means that when the pressure in the system reaches 140 psi, the contacts of the CCS will close, allowing the circuit to be completed. Conversely, when the pressure drops to 130 psi, the contacts will open, breaking the circuit. This pressure range is likely chosen to ensure proper functioning and safety of the equipment.

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• 10.

26C
• 11.

### The apprx. reduction in brake pipe pressure during a Minimum Reduction application of the 26C AB valve is between ________psi and ________psi.

5 7, 5-7
Explanation
During a Minimum Reduction application of the 26C AB valve, the approximate reduction in brake pipe pressure is between 5 psi and 7 psi.

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• 12.

### While applying the train brakes, you should be watching the ________ gauge for the most accurate reading of brake pipe pressure.

equalizing, equalizing reservoir
Explanation
While applying the train brakes, it is important to monitor the equalizing gauge for an accurate reading of the brake pipe pressure. The equalizing reservoir helps to maintain a consistent pressure throughout the train's braking system, ensuring that the brakes are applied evenly and effectively. By monitoring the equalizing gauge, the train operator can ensure that the brake pipe pressure is at the appropriate level for safe and efficient braking.

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• 13.

### What specific J-type relay valve can be found on NJT equipment?

J-1.6, J1.6, J.1.6
Explanation
The specific J-type relay valve that can be found on NJT equipment is the J-1.6, J1.6, or J.1.6.

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• 14.

### When Brake Cylinder pressure is released, what forces the piston back to pull the shoe away from the wheel?

• A.

Return Spring

• B.

Increase in Brake Pipe Pressure

• C.

Decrease in Brake Pipe Pressure

• D.

Control Valve

A. Return Spring
Explanation
When the brake cylinder pressure is released, the return spring is responsible for pulling the shoe away from the wheel. The return spring is a mechanical component that is designed to exert a force in the opposite direction of the applied force, in this case, the force applied by the brake cylinder. This allows the piston to retract and the brake shoe to move away from the wheel, releasing the brake pressure and allowing the wheel to rotate freely.

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• 15.

### The Air Compressors Low Pressure Cylinder delivers air to the High Pressure Cylinder where it is compressed between ________psi and ________psi.

50 and 150, 50-150, 50 150
Explanation
The Air Compressors Low Pressure Cylinder delivers air to the High Pressure Cylinder where it is compressed between 50 and 150 psi. The answer options provided, 50 and 150, 50-150, and 50 150, all indicate the same range of pressure, which is between 50 and 150 psi.

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• 16.

### ___________ ____________ is a device, actuated by brake cylinder pressure, which indicates whether the brakes are applied or released.

• A.

• B.

Indicator Light Panel (local)

• C.

Brake Indicator

• D.

Indicator Light

C. Brake Indicator
Explanation
A brake indicator is a device that is activated by brake cylinder pressure and is used to show whether the brakes are applied or released. It provides a visual indication to the driver or operator of a vehicle, allowing them to easily determine the status of the brakes. This is important for ensuring the safe operation of the vehicle and maintaining control during braking maneuvers.

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• 17.

### ________ is defined as the undesired accumulation of oil and water in the compressed air system continuously formed as compressed air cools.

Condensate
Explanation
Condensate refers to the undesired accumulation of oil and water in the compressed air system that occurs as the compressed air cools. As the air is compressed, it becomes heated and holds more moisture. However, as the air cools down, the moisture condenses and forms droplets of water and oil that can lead to various issues within the compressed air system. Therefore, condensate is a term used to describe this accumulation of oil and water in the system.

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• 18.

### ________ (4 words) is a device used on locomotives and cars to isolate the control valve from the brake pipe. When cut in, the handle is in the vertical position.

Branch Pipe Cutout Cock
Explanation
A branch pipe cutout cock is a device used on locomotives and cars to isolate the control valve from the brake pipe. When the cutout cock is engaged, the handle is positioned vertically. This device helps control the flow of air or fluid in the braking system, allowing for the isolation of the control valve and preventing any unwanted pressure or flow.

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• 19.

### A manually operated device found on all passenger cars and locomotives for the purpose of applying the air brakes at an Emergency rate.

• A.

Emergency Brake Valve

• B.

Oh Shit Handle

• C.

Emergency Reservoir

• D.

Emergency Brake application

A. Emergency Brake Valve
Explanation
The given correct answer is "Emergency Brake Valve." This device is manually operated and is present in both passenger cars and locomotives. Its main function is to apply the air brakes at an emergency rate. This valve is crucial in situations where immediate and forceful braking is required to ensure safety.

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Feb 15, 2021
Quiz Created by
Catherine Halcomb

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