For electric traction, DC series motors are best suited. DC series motors and AC series motors are very much recommended, as they provide a high starting torque Nowadays three-phase induction motors are also being used.
Which motor is more suitable for traction service?
3. AC Series Motor: Many single phase ac motors have been developed for traction purposes but only compensated series type commutator motor is found to be best suited for traction. Single phase induction motors have been abandoned as they are not capable of developing high starting torque.
Which of the following motor is preferred for traction work Mcq?
Explanation: DC motors are used for traction as, according to the characteristics of DC motors speed is inversely proportional to torque and square of armature current as well, if linear magnetization is concerned. Thus, DC motors are perfectly suitable for traction.
Which is consider as a mechanical features of traction motor Mcq?
A traction motor must be mechanically strong and robust and it should be capable of withstanding severe mechanical vibrations. The traction motor should be completely enclosed type when placed beneath the locomotive to protect against dirt, dust, mud, etc.
Which motor is suitable for traction at 25kv 50hz single phase supply?
✨ [Answered] For supply on 25 kV, 50 Hz single phase, suitable motor for electric traction is – Foxoyo.
Which motor is used in traction?
AC traction motors have replaced DC motors in many traction applications. The motors used are induction or asynchronous motors designed to have characteristics suitable for traction. The speed and torque of the motor are controlled by varying the frequency, voltage and current applied to the stator coils.
Why regenerative braking is not possible in DC motor?
In case of DC Series motor, as the speed of Motor increases, the armature current and hence the field flux will decrease and therefore Back emf E can never be greater than the supply voltage V. Therefore, Regenerative Braking is not possible in DC Series Motor.
Why is the DC motor preferred over AC motor?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
Which drive is used in textile industry?
Applications of Industrial Drives > ROLLING MILL DRIVES: The following types of drives are used for rolling mills: (i) DC motors, (ii) AC slip ring motors with speed control. The DC motors, because, of their inherent characteristics, are best suited for the rolling mills.
Which motor is preferred for constant speed and high torque applications?
Both ac and dc motors are suitable for constant speed applications. DC motors provide full torque at zero speed and have a large installed base.
Which braking is not suitable for motors?
Regenerative braking is not possible in a series motor. Explanation: In regenerative braking, the motor acts as a generator. The back emf is more than the terminal voltage in case of regenerative braking.
Which method is most suitable to easily stop the motor?
DC Injection Braking
This is an efficient and effective method of braking most AC motors. DC injection braking provides a quick and smooth braking action on all types of loads, including high- speed and high-inertia loads.
Which motor is not suitable for regenerative braking?
In series motor back emf cannot exceed the supply voltage. So regenerative braking is not possible. 07․
Which frequency is not common in electric traction?
Which of the following frequencies not common in low frequency traction system ? (C) 40 Hz. (D) through rails. (D) dc supply is due to run dc motors.
|Q 1- 15||Q 16- 30|
|Q 31- 45||Q 46- 60|
|Q 61- 76|
Which cooling is provided in traction substation transformer?
Traditional traction transformers are subject to substantial energy losses which heat-up the internal windings. Thus, requiring an external ‘cooling-system’ with a heat exchanger and ‘air-fans’. This cooling-system leads to additional cost, maintenance, and energy consumption for train operators.
Which locomotive has the highest operational availability?
The electric locomotive has the highest operational availability.