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Which is used as electric drive in electric traction system
Petrol-powered
From a diesel engine running
From battery running
All
All
Electric traction systems utilize electric motors as prime movers to provide propulsion. These systems can derive their energy source from various configurations, including diesel-electric locomotives, battery-powered trains, or direct overhead/third-rail supply systems.
Electric traction systems utilize electric motors as prime movers to provide propulsion. These systems can derive their energy source from various configurations, including diesel-electric locomotives, battery-powered trains, or direct overhead/third-rail supply systems.
PmechтАЛ=╧ДтЛЕ╧Й тАФ Mechanical power developed by the traction motor
FtтАЛ=rTтЛЕ╬╖тЛЕGтАЛ тАФ Tractive effort formula where T is motor torque, ╬╖ efficiency, G gear ratio, r wheel radius
The traction system involves converting electrical energy into mechanical energy via traction motors. In a Diesel-Electric drive, an internal combustion engine drives a generator to supply current to motors. In battery drives, chemical energy stored in batteries provides DC power. In standard electrified tracks, energy is collected via pantographs or collector shoes from a catenary or third rail.
Traction motors are typically DC series motors or 3-phase induction motors due to their high starting torque.
Diesel-electric systems use an electric transmission instead of purely mechanical drive to achieve variable torque requirements.
Battery traction is limited to low-power, short-distance applications like shunting or mine locomotives.
High starting torque
Regenerative braking capabilities
Efficient power transmission over long distances
High initial infrastructure cost for overhead lines
Complexity in speed control circuitry
Weight of battery banks in battery-operated units
Mainline railway trains
Metro rail systems
Tramways and industrial haulage
In modern systems, static converters like IGBT-based VFDs are replacing older DC rheostatic control.
The term 'Petrol-powered' in option A refers to internal combustion traction where the electric conversion is the actual drive, though petrol is rare in heavy rail compared to diesel.
D is correct тАФ All listed options represent valid methods or sources used within different electric traction drive configurations.
Remember that 'Electric Traction' refers to the use of electricity to drive the wheels, regardless of whether the primary energy source is onboard (Diesel/Battery) or external (Catenary).