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Questions and Answers
What does the first letter in the classification code for electric locomotives indicate?
What does the first letter in the classification code for electric locomotives indicate?
Which letter denotes Mixed Traffic locomotives in the classification system?
Which letter denotes Mixed Traffic locomotives in the classification system?
What is the designation for AC EMUs in the classification system?
What is the designation for AC EMUs in the classification system?
Which pantograph design is adopted by Indian Railways for 25 kV AC electric locomotives?
Which pantograph design is adopted by Indian Railways for 25 kV AC electric locomotives?
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Which classification is used for locomotives that provide both ac and dc power supply?
Which classification is used for locomotives that provide both ac and dc power supply?
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What feature is primarily used to raise and lower the pantograph on Indian Railways' electric locomotives?
What feature is primarily used to raise and lower the pantograph on Indian Railways' electric locomotives?
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What does the 'A' in the second letter of the classification code signify?
What does the 'A' in the second letter of the classification code signify?
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What is the primary function of the indigenously manufactured air compressor?
What is the primary function of the indigenously manufactured air compressor?
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What type of insulation scheme was initially used in earlier motors?
What type of insulation scheme was initially used in earlier motors?
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Which design changes were adopted to improve the reliability of the 3 phase induction motor?
Which design changes were adopted to improve the reliability of the 3 phase induction motor?
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What is the maximum speed of the WAM-4 electric locomotive?
What is the maximum speed of the WAM-4 electric locomotive?
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Which type of motor is used to drive the air compressor?
Which type of motor is used to drive the air compressor?
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What is the maximum operational speed of the conventional pantograph mentioned?
What is the maximum operational speed of the conventional pantograph mentioned?
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What material has been adopted for current collection in European countries?
What material has been adopted for current collection in European countries?
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What design changes are necessary for pantographs using carbon strips?
What design changes are necessary for pantographs using carbon strips?
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What is the lifespan of the main contact for air blast circuit breakers?
What is the lifespan of the main contact for air blast circuit breakers?
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Which circuit breaker introduced in 1985 has a simplified design?
Which circuit breaker introduced in 1985 has a simplified design?
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How many parts does an Air Blast Circuit Breaker have?
How many parts does an Air Blast Circuit Breaker have?
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What is the total trip-time for Vacuum Circuit Breakers?
What is the total trip-time for Vacuum Circuit Breakers?
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What is a benefit of Vacuum Circuit Breakers compared to Air Blast Circuit Breakers?
What is a benefit of Vacuum Circuit Breakers compared to Air Blast Circuit Breakers?
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Which of the following advantages does Vacuum Circuit Breakers NOT offer compared to Air Blast Circuit Breakers?
Which of the following advantages does Vacuum Circuit Breakers NOT offer compared to Air Blast Circuit Breakers?
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What is the breaking capacity of the air blast circuit breaker?
What is the breaking capacity of the air blast circuit breaker?
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What additional capability does the VCB have that the air blast circuit breaker does not?
What additional capability does the VCB have that the air blast circuit breaker does not?
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What is the primary function of the regulating winding in traction transformers?
What is the primary function of the regulating winding in traction transformers?
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What was the original capacity of the transformer used in WAGI locomotives?
What was the original capacity of the transformer used in WAGI locomotives?
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What significant change has occurred in the design of traction transformers with the introduction of thyristorised converters?
What significant change has occurred in the design of traction transformers with the introduction of thyristorised converters?
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Which component is NOT part of a traction transformer's cooling system?
Which component is NOT part of a traction transformer's cooling system?
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What voltage is provided to the traction vehicles from the contact wire?
What voltage is provided to the traction vehicles from the contact wire?
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What capacity has the traction transformer been increased to for the WAG-7 locomotives?
What capacity has the traction transformer been increased to for the WAG-7 locomotives?
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What type of tap changer has been used on most of the 25 kV ac electric locomotives?
What type of tap changer has been used on most of the 25 kV ac electric locomotives?
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What materials have been adopted in the manufacturing of upgraded traction transformers to minimize losses?
What materials have been adopted in the manufacturing of upgraded traction transformers to minimize losses?
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What does the new classification of insulating material focus on?
What does the new classification of insulating material focus on?
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According to IEC 505, what does the functional evaluation of insulation systems assess?
According to IEC 505, what does the functional evaluation of insulation systems assess?
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What is the primary function of the Arno Convertor?
What is the primary function of the Arno Convertor?
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Which type of construction does the newly developed Arno Convertor feature?
Which type of construction does the newly developed Arno Convertor feature?
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What has been improved in the indigenously manufactured Arno Convertor compared to the ACEC make?
What has been improved in the indigenously manufactured Arno Convertor compared to the ACEC make?
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What issue is associated with Arno Convertor that Indian Railways aims to address?
What issue is associated with Arno Convertor that Indian Railways aims to address?
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Which company initially provided the motor compressor set for the locomotives before other suppliers?
Which company initially provided the motor compressor set for the locomotives before other suppliers?
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What significant change has been made to the Arno Convertors over time?
What significant change has been made to the Arno Convertors over time?
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What is being developed by CLW concerning motor compressor sets?
What is being developed by CLW concerning motor compressor sets?
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What type of locomotives currently utilize static convertors?
What type of locomotives currently utilize static convertors?
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What is the main purpose of the Arno Convertor in electric locomotives?
What is the main purpose of the Arno Convertor in electric locomotives?
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How does the construction of the indigenously developed Arno Convertor differ from the ACEC make?
How does the construction of the indigenously developed Arno Convertor differ from the ACEC make?
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What does the letter 'G' indicate in the classification code for electric locomotives?
What does the letter 'G' indicate in the classification code for electric locomotives?
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What was a significant change made to the Arno Convertor to improve its performance and reliability?
What was a significant change made to the Arno Convertor to improve its performance and reliability?
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Which of the following describes the design of the AM12 pantograph used by Indian Railways?
Which of the following describes the design of the AM12 pantograph used by Indian Railways?
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Which of the following statements is true regarding the evaluation of insulation systems as per IEC 505?
Which of the following statements is true regarding the evaluation of insulation systems as per IEC 505?
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What is the main development concerning motor compressor sets currently being pursued by CLW?
What is the main development concerning motor compressor sets currently being pursued by CLW?
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For what type of electric locomotives is the code WCAM1 designated?
For what type of electric locomotives is the code WCAM1 designated?
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What unique feature does the pantograph employed for 25 kV ac electric locomotives possess?
What unique feature does the pantograph employed for 25 kV ac electric locomotives possess?
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Which letter in the classification code indicates a multiple unit stock?
Which letter in the classification code indicates a multiple unit stock?
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What is the primary purpose of the steel strips on pantographs used in electric locomotives?
What is the primary purpose of the steel strips on pantographs used in electric locomotives?
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What does the letter 'Y' signify in the classification codes for electric locomotives?
What does the letter 'Y' signify in the classification codes for electric locomotives?
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What is the primary advantage of thyristor converters in electric locomotives?
What is the primary advantage of thyristor converters in electric locomotives?
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What is a common reliability issue associated with on-load tap changers in electric locomotives?
What is a common reliability issue associated with on-load tap changers in electric locomotives?
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What has been the impact of advancements in insulating materials on traction motors?
What has been the impact of advancements in insulating materials on traction motors?
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Which operational aspect is significantly improved by using thyristors over traditional tap changers?
Which operational aspect is significantly improved by using thyristors over traditional tap changers?
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What has contributed to the significant reduction in weight of traction motors in EMU applications?
What has contributed to the significant reduction in weight of traction motors in EMU applications?
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What factor primarily affects the maintenance requirements of current on-load tap changers?
What factor primarily affects the maintenance requirements of current on-load tap changers?
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What is a key feature of the thyristor converters currently being implemented?
What is a key feature of the thyristor converters currently being implemented?
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What major change occurred in the classification of insulating materials used in traction motors?
What major change occurred in the classification of insulating materials used in traction motors?
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What operational aspect of traction motors has benefitted from the latest technological advancements?
What operational aspect of traction motors has benefitted from the latest technological advancements?
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Which component's reliability issues specifically contribute to maintenance challenges in tap changers?
Which component's reliability issues specifically contribute to maintenance challenges in tap changers?
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What type of construction is utilized for the traction transformer after the introduction of thyristorised converters?
What type of construction is utilized for the traction transformer after the introduction of thyristorised converters?
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Which component is integral to the forced cooling system of a traction transformer?
Which component is integral to the forced cooling system of a traction transformer?
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What is the maximum capacity of the traction transformer used for WAG-7 locomotives?
What is the maximum capacity of the traction transformer used for WAG-7 locomotives?
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Which winding is designed specifically to choose appropriate voltage for traction motors?
Which winding is designed specifically to choose appropriate voltage for traction motors?
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What change has led to an increase in horsepower for locomotives while maintaining overall dimensions?
What change has led to an increase in horsepower for locomotives while maintaining overall dimensions?
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What feature distinguishes the VCB from the air blast circuit breaker?
What feature distinguishes the VCB from the air blast circuit breaker?
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What materials have been introduced in upgraded traction transformers to reduce losses?
What materials have been introduced in upgraded traction transformers to reduce losses?
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What is the primary role of the auxiliary winding in traction transformers?
What is the primary role of the auxiliary winding in traction transformers?
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Which type of tap changer is predominantly used in the 25 kV AC electric locomotives?
Which type of tap changer is predominantly used in the 25 kV AC electric locomotives?
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What has been eliminated in the design of traction transformers following the use of thyristorized converters?
What has been eliminated in the design of traction transformers following the use of thyristorized converters?
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What is the approximate maximum speed potential of pantographs designed for carbon strips?
What is the approximate maximum speed potential of pantographs designed for carbon strips?
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What is a disadvantage of the Air Blast Circuit Breaker in electric locomotives?
What is a disadvantage of the Air Blast Circuit Breaker in electric locomotives?
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What significant design change is required for pantographs that use carbon strips?
What significant design change is required for pantographs that use carbon strips?
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How many electrical operations can Vacuum Circuit Breakers typically achieve before requiring replacement of the main contact?
How many electrical operations can Vacuum Circuit Breakers typically achieve before requiring replacement of the main contact?
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What is a crucial factor contributing to the maintenance requirements of the Air Blast Circuit Breaker?
What is a crucial factor contributing to the maintenance requirements of the Air Blast Circuit Breaker?
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What type of circuit breaker was first used in electric locomotives since the inception of the 25 kV AC traction system?
What type of circuit breaker was first used in electric locomotives since the inception of the 25 kV AC traction system?
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What is the trip-time for Vacuum Circuit Breakers as compared to Air Blast Circuit Breakers?
What is the trip-time for Vacuum Circuit Breakers as compared to Air Blast Circuit Breakers?
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Which aspect of the Vacuum Circuit Breaker contributes to its reduced maintenance cost?
Which aspect of the Vacuum Circuit Breaker contributes to its reduced maintenance cost?
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What has been a trend in the development of pantographs and circuit breakers over the years?
What has been a trend in the development of pantographs and circuit breakers over the years?
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Study Notes
Electric Rolling Stock Classification
- Locomotives and multiple-unit stocks are classified using a three/four-letter code followed by a number, indicating the individual class and a series.
- Code letters for AC locos and EMUs use 'W' for broad gauge (BG) and 'Y' for metre gauge (MG).
- The second letter indicates the power supply type: 'A' for AC, 'C' for DC, or 'CA' for both.
- The third letter signifies the service class: 'M' (mixed traffic), 'G' (freight), 'P' (passenger), or 'S' (shunting).
- Multiple-unit stocks are denoted by the letter 'U'.
AC Locomotives and EMUs
- Current AC loco and EMU classes include WAG1-7, WAP1-3, WAM1-4, YAM1, WAU1-4, and YAU.
- Some are AC/DC. e.g., WCAM1.
Salient Particulars
- Salient particulars for each AC/DC electric locomotive type are in Table 3.01 and 3.02.
- Colored photographs of each type with features are included as a pull-out.
- Salient particulars for each AC EMU type are in Table 3.03.
- Colored photographs of each AC EMU type with features are included as a pull-out.
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Description
This quiz covers the classification of electric locomotives and multiple-unit stocks. It includes the coding system used to identify different types of rolling stock based on gauge, power supply, and service class. Test your knowledge on current AC loco and EMU classes and their salient particulars.
