# NORAC: Operating Rules (Tro-3, Tro-4, And Tro-5 Definitions) Test

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NORAC (The Northeast Operating Rules Advisory Committee) is a body of railroads that determined a set of operating rules, particularly in North America. This test deals with questions about the TRO-3, TRO-4, and TRO-5 transit rail operations. So, read all the questions carefully and choose the right answer.

Questions and Answers
• 1.

### Suppression is the preventing of an ASES/ATC/ATS penalty brake application by making a required brake pipe pressure reduction. How much is that reduction?

• A.

7psi

• B.

6psi

• C.

15psi

• D.

17psi

Correct Answer
D. 17psi
Explanation
Suppression is the act of preventing a penalty brake application by reducing the brake pipe pressure. In this case, the required reduction in brake pipe pressure for suppression is 17psi.

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• 2.

### What is the minimum approach distance for work around the catenary system?

• A.

3'3"

• B.

5'

• C.

25'

• D.

8'

Correct Answer
A. 3'3"
Explanation
The minimum approach distance for work around the catenary system is 3'3". This distance is necessary to ensure the safety of workers and prevent any contact with the energized parts of the system. By maintaining a minimum distance of 3'3", the risk of electrical shock or injury is minimized, allowing for safe and efficient work to be conducted in the vicinity of the catenary system.

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• 3.

### What device is designed to open and close at a predetermined pressure to limit maximum pressure within the air systems?

• A.

Governor

• B.

Intercooler

• C.

Safety Valve

• D.

Control Valve

Correct Answer
C. Safety Valve
Explanation
A safety valve is a device that is designed to open and close at a predetermined pressure in order to limit the maximum pressure within air systems. It is used to prevent excessive pressure build-up, which could potentially damage the system or cause it to fail. Safety valves are commonly used in various industries and applications, such as steam boilers, pressure vessels, and pneumatic systems, to ensure safe and reliable operation.

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• 4.

### ________ rules are in effect in an interlocking.

Correct Answer
interlocking
Explanation
Interlocking rules refer to the set of regulations and procedures that govern the safe movement of trains through a complex network of tracks and signals. These rules ensure that trains can only enter a specific section of track when it is clear and safe to do so, preventing collisions and ensuring efficient operation. In an interlocking, these rules are crucial for maintaining the overall safety and coordination of train movements.

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• 5.

### ________ ___________ is a brake application accomplished by making one or more brake pipe reductions at a service rate.

• A.

Independent brake

• B.

Service Application

• C.

Service rate of reduction

• D.

None of the above

Correct Answer
B. Service Application
Explanation
A service application is a brake application accomplished by making one or more brake pipe reductions at a service rate. This means that the brakes are gradually applied by reducing the pressure in the brake pipe at a controlled rate. This allows for a smooth and controlled deceleration of the train. The other options, independent brake and service rate of reduction, do not accurately describe this specific type of brake application.

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• 6.

### On freight equipment, what position is the retaining valve set?

• A.

Exhaust

• B.

Open

• C.

Closed

• D.

Service

Correct Answer
A. Exhaust
Explanation
The correct answer is "exhaust." The retaining valve on freight equipment is set to the exhaust position. This means that it is open, allowing air to escape from the system. This helps to release pressure and prevent any potential damage or malfunction in the equipment.

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• 7.

### What is the high voltage cable or connection used to transmit high voltage power for propulsion?

• A.

Control jumper

• B.

Circuit

• C.

Impedance bond

• D.

Bus Jumper

Correct Answer
D. Bus Jumper
Explanation
A bus jumper is a high voltage cable or connection used to transmit high voltage power for propulsion. It is commonly used in electrical systems to connect two buses or sections of a power distribution system. The bus jumper allows for the transfer of power between different parts of the system, ensuring a smooth and efficient flow of electricity.

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• 8.

### An _______________ is a device or piping arrangement, which cools the compressed air between stages of compression.

• A.

Condenser

• B.

Brake Pipe Vent Valve

• C.

Intercooler

• D.

None of the above

Correct Answer
C. Intercooler
Explanation
An intercooler is a device or piping arrangement that cools the compressed air between stages of compression. It is commonly used in turbocharged and supercharged engines to increase the density of the air entering the combustion chamber, resulting in improved engine performance and efficiency. The intercooler helps to reduce the temperature of the compressed air, preventing overheating and potential damage to the engine.

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• 9.

### A ________ is the difference in brake pipe pressure between the front and rear of the train.

Correct Answer
Brake Pipe Gradient
Explanation
A brake pipe gradient refers to the difference in brake pipe pressure between the front and rear of the train. This gradient is important in controlling the braking system of the train, as it allows for the proper distribution of brake force throughout the train. By maintaining a specific gradient, the brakes can be applied evenly across the entire train, ensuring safe and efficient braking.

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• 10.

### An ________ is a station from which an interlocking is operated.

Correct Answer
interlocking station
Explanation
An interlocking station is a station from which an interlocking is operated. An interlocking is a system of signals, switches, and other devices that ensure the safe movement of trains on a railway network. The interlocking station is responsible for controlling and coordinating the movements of trains, ensuring that they do not collide or interfere with each other. It is a crucial component in maintaining the safety and efficiency of railway operations.

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• 11.

### A publication used to notify employees of changes to rules, procedures, or other instructions affecting the movement of trains. Issues periodically by the designated officer.

• A.

General Orders

• B.

Bulletin Orders

• C.

Restriction Bulletin

• D.

Division Notice

Correct Answer
B. Bulletin Orders
Explanation
Bulletin Orders are a publication used to notify employees of changes to rules, procedures, or other instructions affecting the movement of trains. These orders are issued periodically by the designated officer. They serve as a means of communication and ensure that employees are informed about any updates or modifications that may impact their work. Bulletin Orders are an essential tool for maintaining safety and efficiency in the operation of trains.

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• 12.

### An ________________ _________ is a type of track protection that restricts access to a segment of track by using switches derails or flagmen.

• A.

Exclusive Block Occupancy

• B.

Inaccessible Track

• C.

Absolute Block

• D.

Fouling a track

Correct Answer
B. Inaccessible Track
Explanation
An inaccessible track is a type of track protection that restricts access to a segment of track by using switches, derails, or flagmen. This means that the track is not accessible to trains or any other unauthorized personnel, ensuring safety and preventing accidents.

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• 13.

### A ________ is a length of track with defined limits on which train movements are governed by block signals, cab signals, or Form D.

Correct Answer
block
Explanation
A block is a length of track with defined limits on which train movements are governed by block signals, cab signals, or Form D. This means that trains can only move within the specified limits of a block and must adhere to signals or instructions provided by block signals, cab signals, or Form D.

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• 14.

### A _______ _______ is one or more locomotives coupled and operated from a single control station, without cars.

• A.

Locomotive

• B.

Lite Engine

• C.

Train

• D.

Consist

Correct Answer
B. Lite Engine
Explanation
A Lite Engine refers to one or more locomotives that are coupled together and operated from a single control station, without any cars attached. This term is commonly used in the railroad industry to describe a locomotive or locomotives that are being moved or positioned without any freight or passenger cars.

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• 15.

### Two or more tracks with centers spaced less than 25ft apart.

• A.

Adjacent tracks

• B.

Interlocking

• C.

Fouling a track

• D.

None of the above

Correct Answer
A. Adjacent tracks
Explanation
The correct answer is "adjacent tracks." This refers to two or more tracks that are positioned next to each other with centers spaced less than 25ft apart. This close proximity allows for efficient train operations and coordination between the tracks. It is important to ensure proper safety measures and protocols are in place when dealing with adjacent tracks to prevent any accidents or collisions.

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• 16.

### A track designated by Timetable or Schedule upon which train movements are authorized by ABS. DCS or Interlocking Rules.

• A.

Non-controlled track

• B.

OOS Track

• C.

Working Limits

• D.

Main Track

Correct Answer
D. Main Track
Explanation
The correct answer is "Main Track". A main track is a track designated by a timetable or schedule where train movements are authorized by ABS, DCS, or interlocking rules. This track is typically controlled and allows for the movement of trains according to a set schedule.

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• 17.

### Equipment, other than trains, operated on a track for inspection or maintenance.

• A.

Engine

• B.

Crane

• C.

Track Car

• D.

Locomotive

Correct Answer
C. Track Car
Explanation
A track car is a type of equipment that is operated on a track for inspection or maintenance purposes. It is specifically designed for this task and is different from trains, cranes, and locomotives. While trains are used for transportation, cranes are used for lifting heavy objects, and locomotives are used to pull trains, a track car is solely used for inspecting and maintaining the track itself. It allows workers to easily access different sections of the track and perform necessary repairs or inspections.

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• 18.

### ________ are the tracks between the opposing signals of an interlocking.

Correct Answer
Interlocking Limits
• 19.

### A printed booklet that contains schedules and/or special instructions affecting the movement of trains.

• A.

Timetable

• B.

Division Notice

• C.

Trainmaster Notice

• D.

Form D

Correct Answer
A. Timetable
Explanation
A timetable is a printed booklet that contains schedules and/or special instructions affecting the movement of trains. It provides information about the departure and arrival times of trains, as well as any specific instructions or changes to the regular schedule. This allows train operators and passengers to plan their journeys accordingly and stay informed about any updates or disruptions in train services.

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• 20.

### When an angle cock handle is parallel to the brake pipe, the angle cock is open.

• A.

True

• B.

False

Correct Answer
A. True
Explanation
When the angle cock handle is parallel to the brake pipe, it indicates that the angle cock is in the open position. This means that the brake pipe is connected and air can flow through it, allowing the brakes to be applied or released. Conversely, if the angle cock handle is perpendicular to the brake pipe, it indicates that the angle cock is closed and the brake pipe is disconnected, preventing air flow and rendering the brakes inoperative. Therefore, the statement is true.

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• 21.

### Which reservoir has an automatic drain valve? ________

Correct Answer
Number 1 reservoir, auxiliary reservoir
Explanation
The Number 1 reservoir and the auxiliary reservoir both have an automatic drain valve.

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• 22.

### What Class of employees do Locomotive Engineers fall under?

• A.

Class I

• B.

Class A

• C.

Class B

• D.

Class C

Correct Answer
D. Class C
Explanation
Locomotive Engineers fall under Class C employees.

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• 23.

### An unplanned interruption of electrical energy or short circuit.

• A.

Power Interruption

• B.

Circuit Breaker

• C.

Sectionalized Switch

• D.

None of the above

Correct Answer
A. Power Interruption
Explanation
An unplanned interruption of electrical energy or short circuit can cause a power interruption. This means that the flow of electricity is disrupted, resulting in a temporary loss of power. It can occur due to various reasons such as equipment failure, weather conditions, or accidents. During a power interruption, electrical devices may stop working, and there is a need to restore the power supply to resume normal operations. Circuit breakers and sectionalized switches are components used in electrical systems to protect against power interruptions, but they are not the direct cause of the interruption.

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• 24.

### Rails, Impedance Bonds and jumpers all apart of what?

• A.

Catenary System

• B.

Rail Return

• C.

HEP

• D.

Substation

Correct Answer
B. Rail Return
Explanation
Rails, Impedance Bonds, and jumpers are all part of the Rail Return system. The Rail Return system is a component of railway electrification systems, where the return current from the trains flows through the rails back to the power source. Impedance Bonds and jumpers are used to ensure proper electrical continuity and minimize electrical resistance in the rail return system.

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• 25.

### How many volts are used in catenary system in the Hoboken Division?

Correct Answer
27,600 volts
Explanation
The catenary system in the Hoboken Division uses 27,600 volts. This high voltage is necessary to power the trains and provide the necessary energy for them to operate efficiently. The catenary system is an overhead power supply system that uses a series of cables and wires to deliver electricity to the trains. By using 27,600 volts, the system ensures that there is enough power to meet the demands of the trains and keep them running smoothly.

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• 26.

### A device that is closed to energize or connect and opened to de-energize or separate a section(s) of a catenary, signal or third rail system.

• A.

Switch

• B.

Main Transformer

• C.

Sectionalizing Switch

• D.

Circuit Breaker

Correct Answer
C. Sectionalizing Switch
Explanation
A sectionalizing switch is a device that is closed to energize or connect and opened to de-energize or separate a section(s) of a catenary, signal, or third rail system. This means that it allows for the isolation of specific sections of the system, allowing for maintenance or repairs to be carried out without affecting the rest of the system's operation. This is different from a regular switch or circuit breaker, which typically only serve to open or close a circuit. The sectionalizing switch is specifically designed for the purpose of sectioning off parts of the system.

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• 27.

### A __________ is a device which detects movement of the engineer and initiates a penalty brake application when the required frequency of such movement is not maintained.

• A.

ATS

• B.

PTC

• C.

Acknowledger

• D.

Alerter

Correct Answer
D. Alerter
Explanation
The alerter is a device that monitors the movement of the engineer and triggers a penalty brake application if the required frequency of movement is not maintained. This device ensures that the engineer remains attentive and responsive while operating the train, thereby enhancing safety.

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• 28.

### What is the term for a period extending from one midnight to the next midnight?

• A.

Calendar day

• B.

24 hours

• C.

1 day

• D.

Business day

Correct Answer
A. Calendar day
Explanation
A calendar day refers to a period of time that starts at midnight and ends at the following midnight. It is a 24-hour period that is commonly used to measure time in daily activities and scheduling. The term "calendar day" is used to differentiate it from other types of days, such as business days or workdays, which may have different definitions and exclude weekends or holidays.

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• 29.

### What device is used to locomotives and cars to isolate the control valve from the brake pipe?

• A.

Independent brake

• B.

Branch Pipe Cut-out Cock

• C.

Brake Valve Cut-off valve

• D.

Cut-out Cock

Correct Answer
B. Branch Pipe Cut-out Cock
Explanation
The branch pipe cut-out cock is a device used to isolate the control valve from the brake pipe in locomotives and cars. This allows for independent control of the brakes, separate from the main brake system. By closing the cut-out cock, the branch pipe is disconnected from the brake pipe, preventing the flow of pressure and isolating the control valve. This enables the operator to control the brakes independently, providing more flexibility and control over the braking system.

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• 30.

### A device in which compressed air acts upon a piston to transmit the force of the compressed air to the associated brake rigging.

• A.

Braking System

• B.

Reservoir

• C.

Brake Cylinder

• D.

Brake Shoe

Correct Answer
C. Brake Cylinder
Explanation
A brake cylinder is a device that uses compressed air to transmit force to the brake rigging. When the brake pedal is pressed, the compressed air in the cylinder pushes a piston, which in turn applies the brakes. This allows for effective braking in vehicles such as trains or heavy trucks. The brake cylinder is an essential component of the braking system, working in conjunction with other parts like the reservoir and brake shoe to ensure safe and reliable braking.

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• Current Version
• Mar 18, 2023
Quiz Edited by
ProProfs Editorial Team
• Jan 20, 2021
Quiz Created by
Alfredhook3

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