National Academy of Indian Railways : Questions Bank for Participants of Grade ’A’ Foundation Course (Elecrical Engineering)

National Academy of Indian Railways : Questions Bank for Participants of Grade ’A’

Foundation Course (Elecrical Engineering)

Q1 (a)How is the uniform wear of the ‘pantograph strip’ due to rubbing with contact wire ensured in OHE ? 
     (b) Draw sketch of a ‘Cantilever assembly’ of OHE, name different parts and show location of Contact and Catenary Wires. 
Q.2   Explain what do you understand by the following  ? 
a. DC  viz a viz AC Traction
b. Circuit Breaker
c. Electric Energy Conservation
d. End‐on‐ Generation
e. Factor of AC comfort
f. LHB
g. Flasher Light

Q.3  Explain the working of ‘Air Conditioning system’ of AC coach with the help of sketch. 
Q.4 (a) What is the difference between ‘regulated & unregulated OHE’?  How is OHE regulation achieved? 
     (b) What are the functions performed by the following equipments in an electric loco? 
a. Tap Changer
b. Baby Compressor
c. Arno Converter
Q.5 (a)  Write brief note on  the following: 
a. Neutral Section
b. Rail Bonds
c. Power Block & Traffic Block  
(b)   For a WCAM1 Co‐Co 123 T locomotive,  indicate the following:‐
a. Type of Traction              
b. Type of Service                                                    
c. Number of Traction Motors          
d.   Axle Load            
Q.6  Write brief notes on ‐ 
a. Breath Analyser Equipment
b. Tractive Effort and Adhesion
c. Electrical Clearance
d. Difference in requirements of Goods & Passenger Locos
e. Various types of Brakes on electric locomotives
f. Electric Loco Maintenance Schedules
Q.7  Draw ‘power circuit’ diagram of an AC electric loco. 
Q.8  Write brief notes on any four 
a. EMU
b. Safety item on Loco
c. Traction Sub Station
d. Various Train Lighting Systems
e. Roof Mounted Package Unit
f. 3‐Phase Loco
Q. 9   Please mark the correct answer.       
1. Axial distance between catenary & contact wire at the
OHE  support in vertical plane is called ?
(a) implantation

(b) gradient of OHE

(c) encumbrance

(d) stagger
2   The fittings, which is used to transfer the weight of contact wire  to the  catenary  wire is called ? 
(a) section insulator    

(b) Jumpers        

(c) cantilever assembly      

(d) droppers
3  In regulated OHE, how much tension is kept in OHE? 
(a) as per tension / temperature chart              

(b) 3000 kg
(c) 2000 kg                      

(d) 1500 kg
4  What is the  distance of caution boards from neutral section location ? 
(a) 100 m.& 500 m.                

(b) 2000 m. & 1000 m.
(c) 500 m. & 250 m.                

(d) 250 m. & 150 m.
  5     The distance between centre line of  the  track  to  the nearest  face  of  the structure   is called ? 
(a) clear span      

(b) track separation        

(c) implantation

(d) track clearance
Q. 10  WAG4 B‐B loco is provided with 1540 horse power motors.For this loco, please indicate 
(a) Gauge      .
(b) Type of Traction         .
(c) Total Horse Power      .
(d) No of bogies      
(e)    Type of Service       .
Q.11   Describe  organization of electrical department in an electrified division.  Please indicate responsibilities of each officer. 
Q.12   Describe Train lighting systems used in non AC coaches on IR. 
Q.13  Explain the following terms in context of 25kv AC traction distribution system. 
1. Portal    

2.Neutral Section
3.       Stagger    

4.  Isolator
5.  Remote Control Center
Q.14   For a conventional AC loco motive please explain the following‐ 
I. Tap change
II. DJ
III. Regulating winding  
IV. Rectifier
V. Dynamic Brakes   
Q.15 (a)  Please indicate various types of train lighting systems.  
(b)   Please name the factors governing comfort of a passengers in an air‐conditioned coach.  

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