List any two types of relays and contactors with their function used in AC locomotive.

List any two types of relays and contactors with their function used in AC locomotive.
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Types of relays and their function in AC locomotive: 1) Buchholz Relay: To protect traction transformer from incipient faults. 2) Earth fault or Ground fault Relay: To protect the system against all kinds of faults related to ground. 3) Notching Relay: To protect DC motor power circuit. 4) No-volt Relay: Ensures that too much current is not applied to DC motor which has lost the speed while the current is off. 5) Overload Relay: This relay detects excessive current in the circuit. 6) Wheel-Spin Relay: Protects motor from rise in current due to over-speeding of another motor. 7) Electromagnetic Relay: For sequencing of operations of machines and equipment. 8) Current Limiting Relay: Sense current values during the starting of motors and maintain them at limiting values during automatic acceleration of motors.


Types of Contactors and their function in AC locomotive: Each contactor makes or breaks the power circuit. i) Electromagnetic Contactor – when operating coil is energized attracts a soft iron armature which in turn operates moving power contact. When coil is de energized moving contact drops ii) Electro-pneumatic Contactor – moving power contact operates to close the circuit when compressed air acts on a piston in cylinder. Releasing air pressure spring forces the piston to open the contact. iii) Cam and Roller operated Contactor – moving contact is carried at one end of hinged arm and roller is carried at other end. Roller is engaged with cam on shaft. Cam shaft can be moved by air engine or vane motor. 

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Motor controllers are seldom troubled by grounds because ________________. A. cabinet heaters always keep internal components dry B. special insulation is used on wire for vital circuits C. shock mounts on controller panels greatly reduce vibration D. contactors and relays are mounted on nonconducting panels

Description : Motor controllers are seldom troubled by grounds because ________________. A. cabinet heaters always keep internal components dry B. special insulation is used on wire for vital circuits C. ... on controller panels greatly reduce vibration D. contactors and relays are mounted on nonconducting panels

Last Answer : Answer: D

Motor controllers are seldom troubled with grounds because _____________. A. the auxiliary contacts have a high resistance connection B. the contactors and relays are mounted on a nonconducting panel C. the resistor banks are composed of individual series-connected units D. there are separate switches for the motor and the control

Description : Motor controllers are seldom troubled with grounds because _____________. A. the auxiliary contacts have a high resistance connection B. the contactors and relays are mounted on a nonconducting panel ... individual series-connected units D. there are separate switches for the motor and the control

Last Answer : Answer: B

Which of the following statements represents the main difference between a relay and a contactor? A. Contactors control current and relays control voltage. B. A relay is series connected and a contactor is parallel connected. C. Contactors can handle heavier loads than relays. D. Contactors are made from silver and relays are made from copper.

Description : Which of the following statements represents the main difference between a relay and a contactor? A. Contactors control current and relays control voltage. B. A relay is series connected and a contactor ... loads than relays. D. Contactors are made from silver and relays are made from copper.

Last Answer : Answer: C

Draw neat labeled diagram of single phase AC locomotive showing its various equipments of power circuit and give function of each equipment used in power circuit.

Description : Draw neat labeled diagram of single phase AC locomotive showing its various equipments of power circuit and give function of each equipment used in power circuit.

Last Answer : Functions of equipment: 1) circuit breaker: disconnects the locomotive equipment from the supply in the event of fault in the equipment / loco. 2) On load tap changer, used to control the ... 6) Traction motor: operates as per the required operating characteristics to take on the traction load.

State the function of a contactor in a power circuit of locomotive. List different types of it and state one application of each.

Description : State the function of a contactor in a power circuit of locomotive. List different types of it and state one application of each.

Last Answer : Ans: Contactor in power circuit of locomotive is used to connect relevant sections for operation. Connecting or disconnecting the power circuit at different conditions of operation and at different locations. ... heavy power currents. 3) Cam & roller operated - used for group switching.

Excessive humming of AC contactors may be caused by ______________. A. burnt arc shields B. shorted armature coils C. a broken shading coil D. high voltage

Description : Excessive humming of AC contactors may be caused by ______________. A. burnt arc shields B. shorted armature coils C. a broken shading coil D. high voltage

Last Answer : Answer: C

List any four types of electrical faults that may occur on electric locomotive with their causes.

Description : List any four types of electrical faults that may occur on electric locomotive with their causes.

Last Answer : Electric faults and causes in electric locomotive: Changes in the conditions of overloading leading to heating of winding , failure of insulation. Changes in the operating environments such as temperature, ... due to bad maintenance either due to lack of attention which should have been given .

Draw a neat labelled block diagram of AC electric locomotive. State the function of each part.

Description : Draw a neat labelled block diagram of AC electric locomotive. State the function of each part.

Last Answer : labelled diagram ofAC electric locomotive:  Function of AC electric locomotive Parts: 1) Overhead contact wire: Supply of 1-ph, 25KV, 50Hz, AC is given to overhead conductor. 2) Current collecting ... mechanical power to run the train i.e. DC series motor which is used as traction motor.

For given maximum axle load tractive efforts of AC. locomotive will be?

Last Answer : For given maximum axle load tractive efforts of AC. locomotive will be more than that of D.C. locomotive.

List any eight equipment used in auxiliary circuit of electric locomotive.

Description : List any eight equipment used in auxiliary circuit of electric locomotive.

Last Answer : Ans: 1) Batteries , 2) Compressor , 3) Blowers , 4) Exhausters , 5) Pumps , 6) Cab ventilating fans.7) Locomotive heating (if any) , 8) Transformer oil cooling radiator. 9) head light , 10) Flasher light , 11) Marker light , 12) Engine Horn

State the function of following auxiliaries used in electric locomotive, i) Batteries ii ) Compressor iii ) Blower iv ) Exhauster

Description : State the function of following auxiliaries used in electric locomotive, i) Batteries ii ) Compressor iii ) Blower iv ) Exhauster 

Last Answer : Ans: 1) Batteries - supply to run baby compressor which supplies air for initial raising of pantograph and closing of air blast circuit breaker. 2) Compressor - supply air for operation, control and ... blower, reactor blower, SCR blower, traction motor blower etc. 4) Exhausters - for vacuum brakes.

The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the _____________. A. voltage regulators B. field rheostats C. reverse power relays D. prime mover governors

Description : The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the _____________. A. voltage regulators B. field rheostats C. reverse power relays D. prime mover governors

Last Answer : Answer: D

Match the following: List-I List-II A. Varanasi I. Indian Rare Earths Ltd B. Koyali II. Hindustan Machine Tools Ltd C. Pinjore III. Diesel Locomotive Works D. Alwaye IV. Petro-Chemical Complex Codes: A B C D (a) I II III IV (b) IV III II I (c) III IV II I (d) III IV I II

Description : Match the following: List-I List-II A. Varanasi I. Indian Rare Earths Ltd B. Koyali II. Hindustan Machine Tools Ltd C. Pinjore III. Diesel Locomotive Works D. Alwaye IV. Petro-Chemical Complex Codes: A B C D (a) I II III IV (b) IV III II I (c) III IV II I (d) III IV I II

Last Answer : Ans: (c)

Coast Guard Regulations (46 CFR) require manual contactors for operating the general emergency alarm on tank vessels to be located in the navigating bridge, engine room and the ____________. A. deck officers' quarters furthest from the engine room B. galley / dining room areas C. crew accommodations and sleeping spaces D. engineering officers' quarters furthest from the bridge

Description : Coast Guard Regulations (46 CFR) require manual contactors for operating the general emergency alarm on tank vessels to be located in the navigating bridge, engine room and the ____________. A ... C. crew accommodations and sleeping spaces D. engineering officers' quarters furthest from the bridge

Last Answer : Answer: A

Which of the listed conditions occur when '4th point lower' is selected on the winch shown in the illustration? EL-0102 A. Master switch contacts '3', '4', '6', '8', '9', & '10' close. B. Contactors '2, 3, & 4M' and '1A' pick up. C. Master switch contacts '5', '6', '7', '8', and '9' close. D. Contactors '1 & 3M' and '1, 2, & 3A' pick up.

Description : Which of the listed conditions occur when '4th point lower' is selected on the winch shown in the illustration? EL-0102 A. Master switch contacts '3', '4', '6', '8', '9', & '10' close. B. Contactors '2, 3, & 4M' and ' ... , '7', '8', and '9' close. D. Contactors '1 & 3M' and '1, 2, & 3A' pick up.

Last Answer : Answer: B

Which of the listed conditions occur when selection is made for 'third point hoist' on the winch shown in the illustration? EL-0102 A. Master switch contacts '5', '6', '7', '8', and '9' close. B. Contactors '2M', '3M', '4M' and '1A' pick up. C. Contactors '1M', 3M', '1A' and '2A' drop out. D. Master switch contacts '3','4', '6', '8', and '9' close.

Description : Which of the listed conditions occur when selection is made for 'third point hoist' on the winch shown in the illustration? EL-0102 A. Master switch contacts '5', '6', '7', '8', and '9' close. B. Contactors '2M', ' ... ' and '2A' drop out. D. Master switch contacts '3','4', '6', '8', and '9' close.

Last Answer : Answer: D

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

Low voltage releases as used in some shipboard motor starter and control equipment will have which of the following characteristics? A. They trip circuit contactors when the motor starts to overspeed. B. They require manual resetting upon restoration of normal voltage. C. They use a phase sensitive relay to trip contacts in series with the holding coil of the starter. D. They allow the motor to restart upon restoration of normal voltage.

Description : Low voltage releases as used in some shipboard motor starter and control equipment will have which of the following characteristics? A. They trip circuit contactors when the motor starts to overspeed. B. ... coil of the starter. D. They allow the motor to restart upon restoration of normal voltage.

Last Answer : Answer: D

A low-voltage protection circuit is used in electric motor starting equipment to _____________. A. trip circuit contactors when the motor overspeeds due to low voltage B. trip circuit contactors when the motor develops a short circuit due to low voltage C. allow the motor to restart automatically on restoration of voltage without manually resetting D. prevent the motor from restarting automatically on restoration of voltage

Description : A low-voltage protection circuit is used in electric motor starting equipment to _____________. A. trip circuit contactors when the motor overspeeds due to low voltage B. trip circuit ... voltage without manually resetting D. prevent the motor from restarting automatically on restoration of voltage

Last Answer : Answer: D

Explain the need of maintenance of electric locomotive.

Description : Explain the need of maintenance of electric locomotive. 

Last Answer : Need for maintenance : To correct the effects of Wearing out. To correct the effects of deterioration of locomotive component during normal use. In the long run (aging) performance ... availability of locomotive.  Ensures reliability and operational readiness. Ensures safety by all means.

The third generation relays - digital relays - are the basis of distribution system automation because of their: a. Self fault diagnostic capabilities b. Computing capabilities c. Easy interface for remote communication d. All of the above

Description : The third generation relays - digital relays - are the basis of distribution system automation because of their: a. Self fault diagnostic capabilities b. Computing capabilities c. Easy interface for remote communication d. All of the above

Last Answer : The third generation relays - digital relays - are the basis of distribution system automation because of their: a. Self fault diagnostic capabilities b. Computing capabilities c. Easy interface for remote communication d. All of the above

A faulty 'function generator' shown in the illustration may prevent _____________. EL-0095 A. proper pitch control from both the 'bridge' and 'engine room thrust levers' B. the 'split potentiometer's' ability to control pitch C. the pitch meter from indicating accurately D. relays #2 and/or #3 from energizing

Description : A faulty 'function generator' shown in the illustration may prevent _____________. EL-0095 A. proper pitch control from both the 'bridge' and 'engine room thrust levers' B. the 'split potentiometer ... control pitch C. the pitch meter from indicating accurately D. relays #2 and/or #3 from energizing

Last Answer : Answer: A

As shown in the illustration, when the 'speed control' system is in 'SPLIT' _______________. EL-0096 A. Relays #1, #5 and #8 are not used B. the 'slew rated controller' is grounded through Relay #6 C. the RPM 'function generator' and 'thrust levers' have no control D. the 'E/P converters' are bypassed and air is fed directly to the governors via the 'load sharing valve'

Description : As shown in the illustration, when the 'speed control' system is in 'SPLIT' _______________. EL-0096 A. Relays #1, #5 and #8 are not used B. the 'slew rated controller' is grounded through Relay ... E/P converters' are bypassed and air is fed directly to the governors via the 'load sharing valve'

Last Answer : Answer: C

State any four relays used for catenary protection. State function of each relay.

Description : State any four relays used for catenary protection. State function of each relay.

Last Answer : Relays Used for Catenary Protection: 1. MHO relay: Wrong coupling protection. 2. MHO relay: Over current protection at farthest point. 3. Over current relay: Over current protection against faults near substation 4. Under voltage relay: Protection against faults far away from substation. 

What are different types of principles of operation of electro-mechanical relays?

Description : What are different types of principles of operation of electro-mechanical relays?

Last Answer : Answer: Electro-mechanical relays operate by two principles. Electro-magnetic attraction and electromagnetic induction. In electromagnetic attraction relay plunger is drawn to the solenoid or an ... operation is similar to induction motor. Torque is developed by electromagnetic induction principle

Why 2 types of earth fault relays in 6.6 kV side of transformers?

Description : Why 2 types of earth fault relays in 6.6 kV side of transformers?

Last Answer : I – Trips 6.6 kV breakers only. It gives primary protection for 6.6 kV bus bars. I1 – Trips the both HT and LT breakers. It acts as a backup to ref and also acts as backup to bus bar earthfault relay. 

To protect most of the electrical equipment handling low power, the types of relays used are (a) thermocouple (b) electronic and bimetallic (c) both (a) and (b) (d) none of the above

Description : To protect most of the electrical equipment handling low power, the types of relays used are (a) thermocouple (b) electronic and bimetallic (c) both (a) and (b) (d) none of the above

Last Answer : (c) both (a) and (b)

To protect most of the electrical equipment handling low power, the types of relays used are?

Last Answer : To protect most of the electrical equipment handling low power, the types of relays used are thermocouple, electronic and bimetallic.

State use of any four relays for the protection of traction transformer.

Description : State use of any four relays for the protection of traction transformer. 

Last Answer : Relays for the protection of traction transformers:  Inverse time over current relay as back up protection on primary (HV side) - over current protection of transformer and other equipment.  ... .  Buchholz relay - protection from incipient earth or inter winding faults inside the transformer

The power of a locomotive is 315 kW and the total weight of the train is 2000 kN. If the track resistance is 15 N per kN, the maximum speed that the locomotive can attain on level track will be a.43 kmph b.83 kmph c.103 kmph d.107 dynes e.38 kmph

Description : The power of a locomotive is 315 kW and the total weight of the train is 2000 kN. If the track resistance is 15 N per kN, the maximum speed that the locomotive can attain on level track will be a.43 kmph b.83 kmph c.103 kmph d.107 dynes e.38 kmph

Last Answer : e. 38 kmph

The power of a locomotive is 315 kW and the total weight of the train is 2000 kN. If the track resistance is qN per kN, the maximum speed that the locomotive can attain on level track will be a.103 kmph b.83 kmph c.107 dynes d.43 kmph e.63 kmph

Description : The power of a locomotive is 315 kW and the total weight of the train is 2000 kN. If the track resistance is qN per kN, the maximum speed that the locomotive can attain on level track will be a.103 kmph b.83 kmph c.107 dynes d.43 kmph e.63 kmph

Last Answer : e. 63 kmph

A locomotive of weight 100 tonnes is attached to train of wagons weighing 1000 tonnes. The locomotive pulls the wagons with a constant velocity of 36 km/hour. When the coupling between the train and wagons breaks, the wagons roll on 95 m in 10 sec. The distance between the locomotive and the wagons at this instant assuming that the forces acting on the train are unaltered would be a.0.36 m b.0.44 m c.0.77 m. d.0.5 m e.0.66 m

Description : A locomotive of weight 100 tonnes is attached to train of wagons weighing 1000 tonnes. The locomotive pulls the wagons with a constant velocity of 36 km/hour. When the coupling between the train and wagons breaks, the wagons roll on 95 m in ... would be a.0.36 m b.0.44 m c.0.77 m. d.0.5 m e.0.66 m

Last Answer : d. 0.5 m

What was the the name of the first steam powered locomotive by George Stephenson?

Description : What was the the name of the first steam powered locomotive by George Stephenson?

Last Answer : Rocket*Skinny mini*

Who was the first African American locomotive engineer for Houston Beltway Terminal?

Description : Who was the first African American locomotive engineer for Houston Beltway Terminal?

Last Answer : Feel Free to Answer

How much is a 2 cents Locomotive 1870 stamp worth?

Description : How much is a 2 cents Locomotive 1870 stamp worth?

Last Answer : Feel Free to Answer

Diesel locomotive works of the Indian Railways is situated at- (1) Mumbai (2) Bangalore (3) Varanasi (4) Hyderabad

Description : Diesel locomotive works of the Indian Railways is situated at- (1) Mumbai (2) Bangalore (3) Varanasi (4) Hyderabad

Last Answer : (3) Varanasi Explanation: India has the 4th largest coal reserves in the world. Indian mineral industry has contributed significantly to make the nation self-sufficient in coal. To meet the ... other users, the production trends in coal and lignite sectors have shown a remarkable increasing trend.

Locomotive boiler tubes are made of __________ alloys. (A) Arsenic copper (B) Magnesium (C) Aluminium (D) Nickel

Description : Locomotive boiler tubes are made of __________ alloys. (A) Arsenic copper (B) Magnesium (C) Aluminium (D) Nickel

Last Answer : (A) Arsenic copper

If is the speed of a locomotive in km per hour, g is the acceleration due to gravity, is the distance between running faces of the rails and is the radius of the circular curve, the required super elevation is (A) gV²/GR (B) Rg/GV² (C) GR/gV² (D) GV²/gR

Description : If is the speed of a locomotive in km per hour, g is the acceleration due to gravity, is the distance between running faces of the rails and is the radius of the circular curve, the required super elevation is (A) gV²/GR (B) Rg/GV² (C) GR/gV² (D) GV²/gR

Last Answer : (D) GV²/gR

Which of the following is used to produce draught in the locomotive boilers? (A) Chimney (B) Induced draught fan (C) Forced draught fan (D) Steam jet arrangement

Description : Which of the following is used to produce draught in the locomotive boilers? (A) Chimney (B) Induced draught fan (C) Forced draught fan (D) Steam jet arrangement

Last Answer : Option D

Among which locomotive steam engines have the highest efficiency? a) 1 MW b) 2 MW c) 30 MW d) 660 MW

Description : Among which locomotive steam engines have the highest efficiency? a) 1 MW b) 2 MW c) 30 MW d) 660 MW

Last Answer : d) 660 MW

Which of these is a stationary boiler? • Locomotive boiler • Marine boiler • Mobile boiler • Babcock Wilcox boiler

Description : Which of these is a stationary boiler? • Locomotive boiler • Marine boiler • Mobile boiler • Babcock Wilcox boiler

Last Answer : • Babcock Wilcox boiler

Which of the following boiler is best suited to meet the fluctuating demand of steam....... A locomotive boiler. B Lancashire boiler C Cornish boiler D Babcock and wilcox boiler

Description : Which of the following boiler is best suited to meet the fluctuating demand of steam....... A locomotive boiler. B Lancashire boiler C Cornish boiler D Babcock and wilcox boiler

Last Answer : A locomotive boiler.

Which of the following is a water tube boiler........ A]Locomotive boiler B]Lancashire boiler C]Cornish boiler D]Babcock and wilcox boiler

Description : Which of the following is a water tube boiler........ A]Locomotive boiler B]Lancashire boiler C]Cornish boiler D]Babcock and wilcox boiler

Last Answer : in a Truss structure and nature of reactive force is in the nature of

Which of the following boiler is best suited to meet the fluctuating demand of steam....... A]Locomotive boiler. B]Lancashire boiler C]Cornish boiler D]Babcock and wilcox boiler

Description : Which of the following boiler is best suited to meet the fluctuating demand of steam....... A]Locomotive boiler. B]Lancashire boiler C]Cornish boiler D]Babcock and wilcox boiler

Last Answer : A]Locomotive boiler.

The draught in locomotive boilers is produced by a ___________ a) Chimney b) Centrifugal fan c) Steam jet d) All of the above

Description : The draught in locomotive boilers is produced by a ___________ a) Chimney b) Centrifugal fan c) Steam jet d) All of the above

Last Answer : c) Steam jet

Locomotive boiler has a) 137 fire tubes and 44 superheated tubes b) 147 fire tubes and 34 superheated tubes c) 157 fire tubes and 24 superheated tubes d) 167 fire tubes and 14 superheated tubes

Description : Locomotive boiler has a) 137 fire tubes and 44 superheated tubes b) 147 fire tubes and 34 superheated tubes c) 157 fire tubes and 24 superheated tubes d) 167 fire tubes and 14 superheated tubes

Last Answer : c) 157 fire tubes and 24 superheated tubes

Locomotive was invented by Peter Couper in: (a) 1820 (b) 1830 (c) 1835

Description : Locomotive was invented by Peter Couper in: (a) 1820 (b) 1830 (c) 1835

Last Answer : (b) 1830

RBG loading caters for maaaaximum axle load of…….tones for locomotive with trailing loadof…… tonnes/metre of track with maximum axle load of…….tonnes for wagons a)22.9,7.67,25 b)22.5,7.67,22.9* c)25,7.67,22.9, d)None of above

Description : RBG loading caters for maaaaximum axle load of…….tones for locomotive with trailing loadof…… tonnes/metre of track with maximum axle load of…….tonnes for wagons a)22.9,7.67,25 b)22.5,7.67,22.9* c)25,7.67,22.9, d)None of above

Last Answer : b)22.5,7.67,22.9*

GML loading caters for maaaaximum axle load of…….tonnes for locomotive with trailing load of………tonnes/metre. a)22.9,7.67* b)22.5,7.67 c)25,7.67 d)None of above

Description : GML loading caters for maaaaximum axle load of…….tonnes for locomotive with trailing load of………tonnes/metre. a)22.9,7.67* b)22.5,7.67 c)25,7.67 d)None of above

Last Answer : a)22.9,7.67*

A train locomotive whose mass is 1 x 106 kilograms is traveling EAST at a speed of 100 kilometers per hour. A NORTHERLY wind is applying a force of 100 Newtons on the locomotive. How much work is the wind doing on the locomotive for each 10 meters it travels? w) 0 joules x) 1,000 joules y) 10,000 joules z) 100,000 joules

Description : A train locomotive whose mass is 1 x 106 kilograms is traveling EAST at a speed of 100 kilometers per hour. A NORTHERLY wind is applying a force of 100 Newtons on the locomotive. How much work is the wind doing ... 10 meters it travels? w) 0 joules x) 1,000 joules y) 10,000 joules z) 100,000 joules

Last Answer : ANSWER: W -- 0 JOULES