For Same power capacity diesel electric locomotive is expensive than steam locomotive

Question

Examoogle · Accepted Answer

Option A: True

Explanation & Concepts:
Diesel-electric locomotives are significantly more expensive than steam locomotives due to the integration of complex electrical power conversion and transmission systems. While steam locomotives rely on direct mechanical drive, diesel-electrics utilize sophisticated diesel engines coupled with alternators, rectifiers, and high-torque traction motors.

Working Principle: In a diesel-electric locomotive, the engine generates mechanical energy which is converted to electrical energy via a traction generator or alternator. This power is processed through control cabinets and delivered to electric motors mounted on the axles. This multistage energy conversion process requires precision manufacturing, high-quality power electronics, and complex control circuitry compared to the simpler, purely mechanical reciprocating design of a steam locomotive.

Key Formulas: $P_{out} = \eta \cdot P_{diesel}$ — where $P_{out}$ is mechanical output and $\eta$ is the total system efficiency; $T = k \cdot \Phi \cdot I_a$ — torque produced by DC traction motors in diesel-electric units

Key Points: Steam locomotives have lower capital costs but significantly higher maintenance labor requirements.; Diesel-electric units offer higher efficiency ($\eta \approx 30-35\%$) compared to steam ($\eta \approx 6-8\%$).; Availability and reliability factors favor diesel-electric despite higher initial costs.

Advantages: High starting tractive effort due to electric motor characteristics; Better fuel efficiency and lower atmospheric pollution per unit of work; Lower maintenance costs compared to labor-intensive steam boiler operations

Disadvantages: Higher initial capital investment; Dependency on complex electronic control systems; Requirement for specialized skilled personnel for electrical maintenance

Applications: Long-haul freight transportation; Heavy-duty main line passenger services; Non-electrified route operations

Additional Info: Steam locomotives require daily boiler washing and frequent lubrication, leading to higher operational downtime.. Option B is false because it contradicts the economic reality of the technology transition in the mid-20th century.

Answer: A is correct — Diesel-electric locomotives are more expensive to manufacture than steam locomotives due to the inclusion of complex power electronics and electric transmission systems.

Exam Tip: Always remember that while diesel-electrics have higher CAPEX, they provide lower OPEX due to significantly improved thermal efficiency and reliability.

Examoogle · Answer

Option B: FALSE

Feature	Diesel-Electric	Steam
Initial Cost	High	Low
Thermal Efficiency	30-35%	6-8%

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