144 Questions
What is provided to protect the Loco from obstruction on Rails in AC/Diesel Locos?
Rail Guard
What type of relays are Safety Relays in Electric Locos?
Some DU and some DI type
What is the resistance of a conductor inversely proportional to?
Area of cross-section
What is the formula for Electric power?
P=VI
What is the SI unit of resistance?
Ohm
What is the obstruction offered by a material of a conductor to the passage of electric current known as?
Resistance
What is the rate of flow of electric charge known as?
Electric current
What is the purpose of a Cattle Guard in AC/Diesel Locos?
To protect the Loco from obstruction on Rails
What is the purpose of sand in locomotives?
To reduce wheel slipping
Which of the following is an insulating material?
Paper
What is the rating of a fuse wire expressed in?
Amperes
Transformer ratings are given in which unit?
KVA
What is used to collect current from OHE to AC loco?
Pantograph
What type of control is used for speed control in AC locomotives?
Rheostatic control
What is measured using a hydrometer?
Specific gravity of electrolyte
When is Ohm's Law not applicable?
Vacuum tubes
What is the purpose of shunting contactors in a loco?
To stabilize the speed
What type of electrical braking system is used in AC locomotives?
Both
During rheostatic braking, what does the traction motor work as?
Generator
What is the main transformer winding known as in an AC loco?
TFWA
How many tappings are provided in the main transformer of an AC loco?
31
What is the capacity of the transformer provided in WAG-5 locos?
5400 KVA
What is the minimum battery voltage required for energization of AC locos?
90V
What is the capacity of the transformers provided in WAG-7 / WAP-4 locos?
5400 KVA
What causes thick black smoke from the engine?
Low BAP
When does the engine come to idle?
OST
What is the device used to transmit loco speed from wheels to the speedometer?
Tacho Generator
How is traction motor load transferred to the Bogie frame?
Main Journal
What is the recommended height range for side buffers?
1105mm to 1030mm
What is the minimum distance required between the brake block and wheel in release position?
10mm
How many pinion teeth are in a GE-752 TM?
16
What is the purpose of a safety device that brings the engine to idle?
OST
The supercharged air in the air manifold is called?
CAP
What is the safety device provided in the LUBE oil system?
LLOB
When LLOB trips, the engine will?
Shutdown
Where are the MR cooling coils in WDG-4 located?
Radiator room
What is the cooling water capacity in WDM-3A Locomotive?
1300
In WDM-3A engine, the water pump is driven by?
Gear
When the headlight becomes defective, the speed of the train shall not exceed?
40
What is the type of transmission in WDM-3 A locomotive?
DC-AC
During night when the headlight is not glowing, switch ON which light and work further?
Marker light with 40 kmph
What is the horsepower of WDG-3A Loco?
3600
Where is the battery knife switch located in ALCO locos?
Nose compartment
What is the type of engine in ALCO Loco?
4 Stroke
When does the AFL system operate?
All of the above
In AC/Diesel Locos, what is provided to secure the Loco?
Wooden wedges
What is the BP pressure in ALCO Locomotive?
5 kg/cm2
In AC/Diesel Locos, what is provided to protect the Loco from bumping?
Cattle guard
Which item is used to reset AFL?
SW-1 & SW-2
What is the position of MUSD and ECS for engine cranking?
RUN, RUN
In AC/Diesel Locos, what is provided to couple or un-couple?
Both A&B
In AC/Diesel Locos, what safety device is provided to keep alertness of LP/ALP?
Vigilance control device
In AC/Diesel Locos, what safety device is provided to know the speed?
Speedo meter
In AC/Diesel Locos, what is provided to protect the control circuits?
Both A&B
In AC/Diesel Locos, what is provided to protect the Loco from animals?
Cattle Guard
In AC/Diesel Locos, what is used to couple or un-couple the coaches?
CBC coupling
What type of contactors are used in WDG-4?
FS contactors
What is the number of positions in the isolation switch of WDG-4 (ECS)?
2
What does it indicate if the air flow meter shoots up with a jerk while running?
Parting takes place
What type of couplings does the WDM-2 expressor have?
Fast and flexible
What can cause excess brake cylinder pressure?
Wheel skidding
What supplies power to the ECC coil through a breaker?
FPB
What type of filters are used in the fuel oil system?
Socks type
What can cause wheel skidding?
Excess brake cylinder pressure
What causes thick black smoke from the engine?
Low BAP
When does the engine come to idle?
OST
What device transmits loco speed from wheels to the speedometer?
Tacho Generator
How is traction motor load transferred to the Bogie frame?
Suspension Nose
What is the recommended height range for side buffers?
1105mm to 1030 mm
What is the minimum distance required between the brake block and wheel in release position?
10mm
How many pinion teeth are in a GE-752 TM?
17
What safety device brings the engine to idle?
OST
What is the unit of S.F.C (Specific Fuel Consumption)?
gm/hp/hr
Which of the following is not the safety item of Locomotive?
ACP
In WDP-2 how many numbers of cam bushes are fitted in blocks?
14
Which of the following is the prime mover?
Engine
At what temperature does the hot engine alarm sound in WDG-3A locos?
90 degrees centigrade
What is the capacity of the lube oil dip stick gauge in WDG-3A locos?
380 liters
In scavenging period, burnt gases are pushed out by?
By TSC
What is the reason for Hot engine?
All of the above
What is the result of a reduction in BP pressure?
Brakes application
What is the idle RPM of a WDG-4 engine?
360
What increases the copper content in lube oil?
X-head floating bush wear
What is the cause of hammering sound coming from the engine?
Any one of the above
Where is the lube oil cooler located in WDG-4 Locos?
Radiator room
Where is the ¾” Coc (BP COC) located in WDG-3A Locos?
Nose compartment
What is the HP input to traction motors in WDG-4 Locos?
3726
What has replaced the conventional electronic type excitation system in new locos?
Static excitation system
How many teeth are in a split gear?
34
What type of lubrication system is used in WDP-2 Loco?
Forced feed
What is the BHP of WDM-2 Loco?
2400
What is the material of oil seal in ALCO TSC Rotor side?
Brass seal
How many cam lobs are in one cam segment?
4
What is the purpose of honey combing in a locomotive?
Liner
What is the driving source for the water pump in a WDP-2 Loco?
Extension shaft gear
How is the GE governor operated?
Mechanically
Where is the Eddy current clutch located in a locomotive?
Radiator room
What drives the turbo supercharger (TSC) in ALCO Locos?
Exhaust gas
What is the capacity of the fuel oil tank in WDG-3A Loco?
3000 liters
Where is the fuel oil primary filter located in WDM-3A?
Engine room
What indicates the working of the Compressor Lube oil pump?
Sight glass
Where is the fuel pump motor located in WDM-3A?
Engine room
Which governor is provided with LLOB in ALCO Locos?
WOODWARD
How is the feed pipe charged?
By a valve
What is the cause of thick black smoke from the engine?
Less BAP
When does the engine come to idle?
OST
What device transmits loco speed from wheels to the speedometer?
Tacho Generator
How is traction motor load transferred to the Bogie frame?
Suspension Nose
What is the recommended height range for side buffers?
1150 mm to 1000 mm
What is the minimum distance required between the brake block and wheel in release position?
10mm
How many pinion teeth are in a GE-752 TM?
17
What brings the engine to idle?
OST
How many teeth are in a split gear?
34
What type of lubrication system is used in WDP-2 Loco?
Forced feed
What is the horsepower of WDM-2 loco?
2400
What is the material of oil seal in ALCO TSC Rotor side?
Brass seal
How many cam lobs are in one cam segment?
4
What is the BHP of WDP-1 Loco?
2000
How is the water pump driven in a WDP-2 Loco?
Extension shaft gear
What is the operation type of the GE governor?
Pneumatically
In WDG-3A locos, what is the temperature in degrees centigrade at which the hot engine alarm (HEA) will come?
80
What is the capacity of the lube oil dip stick gauge in WDG-3A locos?
380
What is the effect of a reduction in BP pressure in a locomotive?
Brakes application
What is the idle RPM of the engine in WDG-4 locos?
369
Where is the lube oil cooler located in WDG-4 locos?
Radiator room
In WDG-3A locos, where is the ¾” COC (BP COC) located?
Nose compartment
What is the HP input to traction motors in WDG-4 locos?
3726
What is the type of excitation system used in new locomotives?
Static excitation system
What is the reason for a hot engine in a locomotive?
All of the above
What is the unit of Specific Fuel Consumption (S.F.C)?
gm/hp/hr
Which component is responsible for increasing copper content in lube oil?
X-head floating bush wear
Where is the eddy current clutch located in a locomotive?
Control compartment
How many cam bushes are fitted in blocks in a WDP-2 locomotive?
14
What is not a safety item of a locomotive?
ACP
What type of governor is provided in Loco A?
WOOD WARD
What is the prime mover of a locomotive?
Engine
What drives the turbo supercharger in an ALCO loco?
Exhaust gas
What is the fuel oil tank capacity in a WDG-3A locomotive?
6000 liters
During scavenging period, burnt gases are pushed out by what?
By TSC
Where is the fuel oil primary filter located in a WDM-3A locomotive?
Engine room
What is the cause of a hammering sound coming from an engine?
Any one of the above
Where is the fuel pump motor located in a WDM-3A locomotive?
Engine room
What indicates the working of the compressor lube oil pump?
Sight glass
What valve is used to charge the feed pipe?
Injecting valve
Study Notes
AC/Diesel Locos
- Cattle Guard is provided to protect the Loco from obstruction on Rails.
Electric Locos
- Safety Relays are Some DU and some DI type relays.
Electric Power
- The resistance of a conductor is indirectly proportional to the Area of cross-section.
- The formula for Electric power is P=VI.
- The SI unit of resistance is Ohm.
- The obstruction offered by a material of conductor to the passage of electric current is known as Resistance.
- The rate of flow of electric charge is known as Electric current.
Insulating Materials
- Paper is an insulating material.
Ohm's Law
- Ohm’s Law is not applicable to Vacuum tubes.
Fuse Wire
- The rating of a fuse wire is always expressed in Amperes.
Transformer Ratings
- Transformer ratings are given in KVA.
Hydrometer
- Hydrometer is used for measuring the Specific gravity of electrolyte.
Locomotives
- Sand is used in Locomotives to avoid Wheel skidding and Wheel slipping.
- Current is collected from OHE to AC loco through Pantograph.
Speed Control
- The speed control method used in AC locomotive is Regenerative control.
- Shunting contactors are provided in the loco for To stabilize the speed.
Electrical Braking System
- The type of Electrical braking system used in AC locomotive is Regenerative.
Rheostatic Braking
- During Rheostatic braking, traction motor works as a Generator.
Main Transformer
- The main transformer winding is known as TFWR.
- In AC Loco, Main transformer is connected with 32 no.of tappings.
- In WAG-5 locos, the capacity of transformer provided is 5000 KVA.
- In WAG-7 / WAP-4 locos, the capacity of transformers provided is 5000 KVA.
Battery Voltage
- The minimum Battery voltage is required for energisation of AC locos is 90V.
Engine and Locos
- Engine given thick black smoke due to low BAP.
- Engine comes to idle through OST.
- Traction motor load is transferred on Bogie frame through Axle Box.
- Height of side Buffer should be maintained between 1105mm to 1030 mm.
Safety Devices
- Minimum distance between Brake block and Wheel in release position should be 5mm.
- No. of Pinion teeth in GE-752 TM is 17.
- To secure the Loco, Wooden wedges will be given.
- In AC/Diesel locos, to protect the loco from bumping, Rail guard is given.
- To keep alertness of LP/ALP, Vigilance control device is provided.
AC/Diesel Locos
- To know the speed, Speedo meter is provided.
- To protect the control circuits, MCB is provided.
- To protect the Loco from animals, Cattle Guard is provided.
- Cab lights are used in AC/Diesel locos.
Engine Cranking and AFL
- For engine cranking, MUSD and ECS position should be RUN, RUN.
- AFL system operates during D-1 emergency, ACP, GUARD brake application.
- SW-1& SW-2 are used to reset AFL.
- BP pressure in ALCO Locomotive is 5 kg/cm2.
- HP of WDG-3A Loco is 3600.
Transmission and Battery
- Type of transmission in WDM-3 A is DC-DC.
- Battery knife switch is located in Nose compartment.
- Type of engine in ALCO Loco is 4 Stroke.
Air System
- The super charged air in the air manifold is called BAP.
- Safety device provided in the LUBE oil system is GFOLR.
- When LLOB trips, the engine will come to IDLE.
Cooling System
- MR cooling coils in WDG-4 are located at Radiator room.
- Cooling water capacity in WDM-3A Locomotive is 910 liters.
- Water pump in WDM-3A engine is driven by Belts.
Head Light and Other
- When head light becomes defective, speed of the train shall not exceed 30 kmph.
- During night when head light is not glowing, switch ON Microprocessor control light and work further with 40 kmph.
- In WDG-4, power contactors are replaced with FS contactors.
- ECS isolation switch is having 2 positions.
Air Flow and Brakes
- While on run, if Air flow meter shoots up with jerk, it means Parting takes place.
- Excess brake cylinder pressure can cause Wheel skidding.
- ECC coil gets supply through MCB.
Fuel Oil System
- In Fuel oil system, Socks type filters are used.
Engine and Performance
- Engine given thick black smoke due to low BAP or defective CCE motor
- Engine idle RPM in WDG-3A locos is 360 and in WDG-4 locos is 469
- Engine comes to idle due to OST, ACP, or Low Lube oil indication
- Hammering sound coming from Engine is due to Exhaust valve bend, Fuel cam worn out, or X-head roller worn out
- Hot engine alarm (HEA) will come at 90 degrees centigrade in WDG-3A locos
Loco and Bogie
- Traction motor load is transferred on Bogie frame through Main Journal, Axle Box, or Helical Coil spring
- Height of side Buffer should be maintained between 1150 mm to 1000 mm
- Minimum distance between Brake block and Wheel in release position should be 10mm
Speed and Transmission
- Device used to transmit loco speed from wheels to the speedometer is called Tacho Generator or Axle Generator
- No. of Pinion teeth in GE-752 TM is 17
- HP input to Traction motors in WDG-4 Loco is 3726
- Conventional electronic type excitation system is replaced with a new system in new Locos
- Reduction in BP pressure causes Brakes release, slow release, or application
- Split gear has 30 teeth in new Locos
Lubrication and Cooling
- Lube oil dip stick gauge of WDG-3A has 400 liters capacity
- Lube oil cooler in WDG-4 Locos is located in Radiator room
- In WDP-2 Loco, Splash Type lubrication system is used
- Water pump is driven from Split gear or Extension shaft gear
Governors and Safety Devices
- GE governor is operated mechanically
- Eddy current clutch is located in Nose compartment
- LLOB is provided in GE Governor Loco
- OST, ACP, and LWS are safety devices in Loco
- Hot engine alarm (HEA) will come at 90 degrees centigrade in WDG-3A locos
Fuel and Turbo Charger
- Fuel oil tank capacity in WDG-3A Loco motive is 4000 liters
- Fuel oil primary filter in WDM-3A is located in Engine room
- Fuel pump motor in WDM-3A is located in Engine room
- Turbo super charger (TSC ) in ALCO Locos is driven by Exhaust gas
Engine and Performance
- Engine given thick black smoke due to low BAP or defective CCE motor
- Engine idle RPM in WDG-3A locos is 360 and in WDG-4 locos is 469
- Engine comes to idle due to OST, ACP, or Low Lube oil indication
- Hammering sound coming from Engine is due to Exhaust valve bend, Fuel cam worn out, or X-head roller worn out
- Hot engine alarm (HEA) will come at 90 degrees centigrade in WDG-3A locos
Loco and Bogie
- Traction motor load is transferred on Bogie frame through Main Journal, Axle Box, or Helical Coil spring
- Height of side Buffer should be maintained between 1150 mm to 1000 mm
- Minimum distance between Brake block and Wheel in release position should be 10mm
Speed and Transmission
- Device used to transmit loco speed from wheels to the speedometer is called Tacho Generator or Axle Generator
- No. of Pinion teeth in GE-752 TM is 17
- HP input to Traction motors in WDG-4 Loco is 3726
- Conventional electronic type excitation system is replaced with a new system in new Locos
- Reduction in BP pressure causes Brakes release, slow release, or application
- Split gear has 30 teeth in new Locos
Lubrication and Cooling
- Lube oil dip stick gauge of WDG-3A has 400 liters capacity
- Lube oil cooler in WDG-4 Locos is located in Radiator room
- In WDP-2 Loco, Splash Type lubrication system is used
- Water pump is driven from Split gear or Extension shaft gear
Governors and Safety Devices
- GE governor is operated mechanically
- Eddy current clutch is located in Nose compartment
- LLOB is provided in GE Governor Loco
- OST, ACP, and LWS are safety devices in Loco
- Hot engine alarm (HEA) will come at 90 degrees centigrade in WDG-3A locos
Fuel and Turbo Charger
- Fuel oil tank capacity in WDG-3A Loco motive is 4000 liters
- Fuel oil primary filter in WDM-3A is located in Engine room
- Fuel pump motor in WDM-3A is located in Engine room
- Turbo super charger (TSC ) in ALCO Locos is driven by Exhaust gas
Quiz questions on electric and diesel locomotives, covering safety features and technical aspects.
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