Explain regenerative braking for D.C. series motor.

Explain regenerative braking for D.C. series motor.
by

1 Answer

Answer :

Schematic diagram of regenerative braking of D.C. series :- 

image

Explanation of regenerative braking: During normal running, motors are connected in parallel with field winding in series w.r.t. armature as shown in figure A. At the time of regenerating braking all the armature are connected in parallel without series field winding and all series field winding are connected in series with external resistance & are separately excited as shown in fig.B At this time motor acts as a generator and excitation current is so adjusted that generated voltage (Eg) is greater than supply voltage (V), so that power will be fed back to supply. This process is continued up to the speed of train reaches up to 20 to 16 km/hr. after that it is difficult to maintain generated voltage greater than supply voltage. So, electric regenerative braking is stopped For final stop mechanical braking is applied. External Resistances are connected to limit the current.

by

Related questions

Regenerative braking (A) Can be used for stopping a motor. (B) Cannot be easily applied to DC series motors. (C) Can be easily applied to DC shunt motors (D) Cannot be used when motor load has overhauling characteristics.

Description : Regenerative braking (A) Can be used for stopping a motor. (B) Cannot be easily applied to DC series motors. (C) Can be easily applied to DC shunt motors (D) Cannot be used when motor load has overhauling characteristics.

Last Answer : Ans: B Because reversal of Ia would also mean reversal of field and hence of Eb

A motor using a rheostat in the motor circuit to vary the speed is called a ____________. A. squirrel-cage induction motor B. regenerative braking motor C. wound-rotor induction motor D. synchronous motor

Description : A motor using a rheostat in the motor circuit to vary the speed is called a ____________. A. squirrel-cage induction motor B. regenerative braking motor C. wound-rotor induction motor D. synchronous motor

Last Answer : Answer: C

A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply

Description : A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply voltage is 400V. The armature current during regenerative braking is kept constant at 300 A with negligible ripple. For a duty cycle of 60% ... to the DC supply is  (a) 78 kW (b) 58 kW (c) 38 kW (d) 48 kW

Last Answer : 48

The progressive operation of the contactors marked 'A' provide the winch shown in the illustration with __________. EL-0102 A. accumulation B. dynamic braking C. acceleration D. regenerative braking

Description : The progressive operation of the contactors marked 'A' provide the winch shown in the illustration with __________. EL-0102 A. accumulation B. dynamic braking C. acceleration D. regenerative braking

Last Answer : Answer: C

What Is Meant By Regenerative Braking?

Description : What Is Meant By Regenerative Braking?

Last Answer : When the supply is cutt off for a running motor, it still continue running due to inertia. In order to stop it quickly we place a load(resitor) across the armature winding and the motor should ... and due to load the motor stops quickly.This type of breaking is called as Regenerative Breaking .

What is meant by regenerative braking?

Description : What is meant by regenerative braking?

Last Answer : When the supply is cut off for a running motor, it still continue running due to inertia. In order to stop it quickly we place a load (resistor) across the armature winding and the motor should ... and due to load the motor stops quickly. This type of breaking is called as Regenerative Breaking .

_____ technology helps to stop a combustion engine when the vehicle pulls to a stop and restart it when driver accelerates. • Start stop technology • Passive braking technology • Regenerative braking technology • Internal cooling technology

Description : _____ technology helps to stop a combustion engine when the vehicle pulls to a stop and restart it when driver accelerates. • Start stop technology • Passive braking technology • Regenerative braking technology • Internal cooling technology

Last Answer : • Regenerative braking technology

Regenerative braking involves : a) Nano fibers that repair the surface of brake pads b) Reducing the amount of friction c) Reclaiming heat from the brake and using it for power d) All of the above

Description : Regenerative braking involves : a) Nano fibers that repair the surface of brake pads b) Reducing the amount of friction c) Reclaiming heat from the brake and using it for power d) All of the above

Last Answer : c) Reclaiming heat from the brake and using it for power

In a regenerative braking, which of the following is generally true?

Description : In a regenerative braking, which of the following is generally true?  (a) Back e.m.f. in the motor exceeds the applied voltage (b) Back e.m.f. is less than the applied voltage ... dissipated in a resistance (d) Kinetic energy of the motor is dissipated through free wheeling diode across the motor 

Last Answer : In a regenerative braking, which of the following is generally true?  (a) Back e.m.f. in the motor exceeds the applied voltage (b) Back e.m.f. is less than the applied voltage ... in a resistance (d) Kinetic energy of the motor is dissipated through free wheeling diode across the motor 

Regenerative braking can:

Description : Regenerative braking can: (A) be used for stopping a motor (B) not be easily applied to DC series motors (C) be easily applied to DC shunt motors (D) not be used for heavy duty -cycle motors

Last Answer : Regenerative braking can: not be easily applied to DC series motors

Regenerative method of braking is based on that?

Last Answer : Regenerative method of braking is based on that back e.m.f. is equal to the applied voltage.

State its types electrical braking.

Description : State its types electrical braking.

Last Answer : Types of Electrical Braking: Electrical braking system: 1. Plugging 2. Rheostatic (Dynamic) Braking 3. Regenerative Braking 4. Electromagnetic Braking 5. Eddy current braking

State advantages and disadvantages of electric braking over mechanical braking.

Description : State advantages and disadvantages of electric braking over mechanical braking.

Last Answer : Advantages: 1. It is most reliable braking system. 2. Breaking actuation time is small as higher value of braking retardation is obtained. 3. Electrical braking is smooth & gradual. 4. Life of ... energy is surplus. 4. Initial cost is more due to other control equipments & circuitry. 

"DC series motor is used for traction purpose." Justify your answer with any six characteristics.

Description : "DC series motor is used for traction purpose." Justify your answer with any six characteristics.

Last Answer : Due To Following Reasons DC Series Motor Is Used For Traction Purpose:- 1. DC Series motor robust in construction and capable to withstand against continuous vibration. 2. DC series motor weight is 1. ... . 12. Torque obtained by DC series motor is smooth and uniform, so it improves riding quality

A series wound DC motor has its armature and field connected in series with a resistor. When the motor is disconnected from its power supply, this motor will exemplify __________. A. the proper connections for across the line starting B. the proper connections for an automatic strip heater C. a reversing controller circuit D. dynamic braking

Description : A series wound DC motor has its armature and field connected in series with a resistor. When the motor is disconnected from its power supply, this motor will exemplify __________. A. the ... the proper connections for an automatic strip heater C. a reversing controller circuit D. dynamic braking

Last Answer : Answer: D

Explain the requirements of elevator motor. State with reason best suitable motor for elevator.

Description : Explain the requirements of elevator motor. State with reason best suitable motor for elevator.

Last Answer : Ideal requirements of elevator motor: 1. High starting torque along with high rate of acceleration and retardation. 2. Motors are compact in size especially smaller in diameter. 3. Speed of motor should not exceed 900 ... 4. Permanent magnet AC Motor. 5. Split Phase AC I.M. 6. Capacitor Start I.M.

Explain the suitability of 3-phase induction motor for traction service.

Description : Explain the suitability of 3-phase induction motor for traction service. 

Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

For using regenerative breaking, the most suitable motor is :

Description : For using regenerative breaking, the most suitable motor is :  (A) DC series motor  (B) Slip ring induction motor  (C) Squirrel cage induction motor  (D) Synchronous motor

Last Answer : For using regenerative breaking, the most suitable motor is : Slip ring induction motor

State any four desirable characteristics of ideal traction motor. State the names of different traction motor used.

Description : State any four desirable characteristics of ideal traction motor. State the names of different traction motor used.

Last Answer : Desirable characteristics of ideal traction motors:-  A) Mechanical Properties or characteristics: 1) It should be robust in construction to withstand against continuous vibrations. 2) Weight of motor per HP ... AC series motor 3. 3-Ph, Slip-ring induction motor 4. Linear induction motor (LIM)

Why noise of motor is produced? How it can be reduced?

Description : Why noise of motor is produced? How it can be reduced?

Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Write eight desirable characteristics of traction motor.

Description : Write eight desirable characteristics of traction motor.

Last Answer : Desirable characteristics of ideal traction motors:- 1) It should be robust in construction to withstand against continuous vibrations. 2) Weight of motor per HP should be minimum in order to increase pay ... maintenance cost. 17) It should have high efficiency. 18) It should have long life.

The purpose of 'R6' in the winch circuit shown in the illustration is to _______________. EL-0102 A. maintain dry conditions within the winch brake box B. keep the series field current at a low value during 'fourth and fifth point lowering' C. act as the armature dynamic braking load to assist the winch in stopping D. limit the armature current during lowering operation with heavy loads

Description : The purpose of 'R6' in the winch circuit shown in the illustration is to _______________. EL-0102 A. maintain dry conditions within the winch brake box B. keep the series field current at ... to assist the winch in stopping D. limit the armature current during lowering operation with heavy loads

Last Answer : Answer: C

During rheostat braking of D.C. series motors?

Last Answer : During rheostat braking of D.C. series motors motor is run as a generator.

Which of these is the purpose of the power-split device? • To split electrical energy into mechanical energy • To allow both the engine and electric motor to propel the vehicle • To recharge the battery while braking

Description : Which of these is the purpose of the power-split device? • To split electrical energy into mechanical energy • To allow both the engine and electric motor to propel the vehicle • To recharge the battery while braking

Last Answer : • To allow both the engine and electric motor to propel the vehicle

Which of these is the purpose of power-split device a) To split Electrical Energy into Mechanical Energy. b) To allow both the engine and Electric motor to propel the vehicle c) To recharge the battery while braking d) To recharge the brakes while driving

Description : Which of these is the purpose of power-split device a) To split Electrical Energy into Mechanical Energy. b) To allow both the engine and Electric motor to propel the vehicle c) To recharge the battery while braking d) To recharge the brakes while driving

Last Answer : b) To allow both the engine and Electric motor to propel the vehicle

For which types of D.C. motor, dynamic braking is generally used ?

Last Answer : Shunt motors,  Series motors, Compound motors

Explain the factors affecting framing of tariffs.

Description : Explain the factors affecting framing of tariffs.

Last Answer : Factors affecting framing of tariffs:- 1. Total recovery of all taxes , duties and other charges 2. Expenses on premium (installment) paid to insurance company. 3. T&D losses. 4. Electricity cannot ... L.F. 12. The tariff should be simple cheap and capable of easy explanation to consumers. 

Explain with neat diagram construction and working of Ajax Wyatt vertical core induction furnace.

Description : Explain with neat diagram construction and working of Ajax Wyatt vertical core induction furnace.

Last Answer : Neat sketch of Ajax Wyatt' vertical core furnace: Construction of Ajax Wyatt' vertical core furnace: Vertical core type induction heating furnace is nothing but transformer. It consists of ... is utilized to melt the charge. Where, R = Resistance of charge & I secondary current.

Explain with the diagram butt welding. State its applications.

Description : Explain with the diagram butt welding. State its applications. 

Last Answer : Diagram butt welding:-  Explanation: Transformer used for welding is designed for low voltage and high current secondary. Transformer is oil cooled The job is clamped as shown in fig. two parts which ... : 1) For welding rod, wire, pipe etc 2) For joining thick metal plates or bars at end

Explain the factors to be considered while designing a lighting scheme.

Description : Explain the factors to be considered while designing a lighting scheme.

Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Define load equalisation for electric motors. Explain how it is obtained for electric motors.

Description : Define load equalisation for electric motors. Explain how it is obtained for electric motors.

Last Answer : Define load equalization for electric Motor: There are many types of load which are fluctuating in nature e.g. wood cutting m/c, Rolling mill. Etc. For such type of loads, load equalization is ... increases so cost of cable increases, Hence it is necessary to smooth out load fluctuations on motor.

What is the full form of AS/RS in FMS? a.Automated storage and recovery system b.Automatic storage and rotary system c.Automated storage and retrieval system d.Automated storage and regenerative system

Description : What is the full form of AS/RS in FMS? a.Automated storage and recovery system b.Automatic storage and rotary system c.Automated storage and retrieval system d.Automated storage and regenerative system

Last Answer : c.Automated storage and retrieval system

Which one of the following cell I totipotent and responsible for regenerative capacity in sponges ?

Description : Which one of the following cell I totipotent and responsible for regenerative capacity in sponges ?

Last Answer : Which one of the following cell I totipotent and responsible for regenerative capacity in sponges ? ... B. Thesocytes C. Archaeocytes D. Scleroblast

Assertion : Epithelia are highly regenerative. Reason : When epithelia gets damaged they regenerate more repidly then other Tissue.

Description : Assertion : Epithelia are highly regenerative. Reason : When epithelia gets damaged they regenerate more repidly then other Tissue.

Last Answer : Assertion : Epithelia are highly regenerative. Reason : When epithelia gets damaged they regenerate more ... . If both Assertion & Reason are false.

Which cells in our body have the least regenerative power? (1) Brain cells (2) Muscle cells (3) Bone cells (4) Liver cells

Description : Which cells in our body have the least regenerative power? (1) Brain cells (2) Muscle cells (3) Bone cells (4) Liver cells

Last Answer : (1) Brain cells Explanation: Brain cells do not regenerate. Once lost, they do not come back. Research from Karolinska Institute in Sweden haves shown that the nerve cells of the brain remain the same throughout a person's life.

Which cells in our body have the least regenerative power? (1) Brain cells (2) Muscle cells (3) Bone cells (4) Liver cells

Description : Which cells in our body have the least regenerative power? (1) Brain cells (2) Muscle cells (3) Bone cells (4) Liver cells

Last Answer : (1) Brain cells Explanation: Brain cells do not regenerate. Once lost, they do not come back. Research from Karolinska Institute in Sweden haves shown that the nerve cells of the brain remain the same throughout a person's life.

A form of regenerative repeater for transmitting signals over a long cable received through a relay in a clearer form. A. Active generator B. Active repeater C. Interpolator D. Audio generator

Description : A form of regenerative repeater for transmitting signals over a long cable received through a relay in a clearer form. A. Active generator B. Active repeater C. Interpolator D. Audio generator

Last Answer : C. Interpolator

Which of the following is a non-regenerative fixed bed catalytic reforming process? (A) Hydroforming (B) Thermofor catalytic reforming (C) Platforming (D) Hyperforming

Description : Which of the following is a non-regenerative fixed bed catalytic reforming process? (A) Hydroforming (B) Thermofor catalytic reforming (C) Platforming (D) Hyperforming

Last Answer : (C) Platforming

Platforming is a __________ process. (A) Moving bed (B) Fluidised bed (C) Non-regenerative & fixed bed (D) Regenerative

Description : Platforming is a __________ process. (A) Moving bed (B) Fluidised bed (C) Non-regenerative & fixed bed (D) Regenerative

Last Answer : (C) Non-regenerative & fixed bed

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred (A) Through a metallic wall (B) By direct contact of hot flue gas with air (C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material (D) None of these

Description : In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred (A) Through a metallic wall (B) By direct contact of hot flue gas with air (C) By ... material (like chequor bricks) and then heating the air from this hot material (D) None of these

Last Answer : (C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

Pot furnace which is either regenerative or recuperative, is used in the manufacture of (A) Glass (B) Stainless steel (C) Potteries (D) Refractory bricks

Description : Pot furnace which is either regenerative or recuperative, is used in the manufacture of (A) Glass (B) Stainless steel (C) Potteries (D) Refractory bricks

Last Answer : (A) Glass

Operation of blast furnace stove is based on the principles of a __________ furnace. (A) Regenerative (B) Recuperative (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Operation of blast furnace stove is based on the principles of a __________ furnace. (A) Regenerative (B) Recuperative (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (A) Regenerative

Which is a regenerative furnace? (A) Coke oven heating chamber (B) Open hearth furnace (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Which is a regenerative furnace? (A) Coke oven heating chamber (B) Open hearth furnace (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

For a given set of operating pressure limits of a Rankine cycle, the highest, efficiency occurs for [GATE-1994] (a) Saturated cycle (b) Superheated cycle (c) Reheat cycle (d) Regenerative cycle.

Description : For a given set of operating pressure limits of a Rankine cycle, the highest, efficiency occurs for [GATE-1994] (a) Saturated cycle (b) Superheated cycle (c) Reheat cycle (d) Regenerative cycle. 

Last Answer : (d) Regenerative cycle. 

Types of waste heat exchanger are: a) Regenerative and recuperative burners b) Economizers c) Waste heat boilers d) All of the above

Description : Types of waste heat exchanger are: a) Regenerative and recuperative burners b) Economizers c) Waste heat boilers d) All of the above

Last Answer : All of the above

Apart from feed heating, what should a plant have to obtain a gain in thermal efficiency? a) Lubrication b) Differential heating c) Reheating cycles d) Regenerative cycles

Description : Apart from feed heating, what should a plant have to obtain a gain in thermal efficiency? a) Lubrication b) Differential heating c) Reheating cycles d) Regenerative cycles

Last Answer : c) Reheating cycles

Which components provide the regenerative feedback signal in the phase-shift oscillator?

Description : Which components provide the regenerative feedback signal in the phase-shift oscillator?

Last Answer : Resistor-capacitor networks.

What three functions does the transistor in a regenerative detector serve?

Description : What three functions does the transistor in a regenerative detector serve?

Last Answer : Oscillator, mixer, and detector.

Each ____________________ in an FDDI system acts as a regenerative repeater.

Description : Each ____________________ in an FDDI system acts as a regenerative repeater.

Last Answer : node