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RRB JOBS QUESTION BANK : JUNIOR ENGINEER (NON-AC) SHORT ANSWER TYPE QUESTIONS
QUESTION BANK FOR SELECTION TO THE POST OF JUNIOR ENGINEER (NON-AC)
Part – A (TRAIN LIGHTING)
SHORT ANSWER TYPE QUESTIONS:
1) What are the Fire prevention measures followed in coaches?
Ans:
- Adequate and proper maintenance of Electrical devices in the coaches as per laid norms.
- All electrical equipments should be maintained properly.
- Check all the electrical circuits for foul (burning) smell, smoke and sparks.
- After completion of the loading, guard must ensure that all the lights in the luggage portion of the SLR are switched “off” to eliminate possibility of short-circuiting.
- Electrical junction boxes should be covered and locked positively in all TL coaches especially in pantry cars.
- Ensure all electrical connections are intact and there are no loose fittings in the coaches.
- Do not allow battery boxes in ‘open’ condition and also MS sheet covering is provided in electrical circuits.
- Ensure correct rated Over load, over voltage protection, fuses/MCBs are provided in electrical circuits.
- Ensure the availability and proper knowledge of usage of fire extinguishers in AC coaches.
2) What are Levels of electrical protections in TL coaches?
Ans:
a. Battery: TL coaches are provided with 120 Ah, 110 V flooded type Lead Acid Battery or VRLA battery. 40 A HRC fuse provided in main positive side of Battery circuit in under frame.
b. Alternator & Regulator: TL coaches are provided with 4.5 kW alternator & RRU/ERRU.
35 A HRC fuse is provided in one phase of AC input.
6 A HRC fuse is provided for field control circuit.
c. Fuse cum rotary switch panel
35 A HRC fuse is provided in main –ve circuit.
L1 & L2 lighting circuits are provided with 16 A HRC fuse each in +ve side.
Fan is provided with 16 A HRC fuse in +ve side.
SPM circuit is provided with 16 A HRC fuse in +ve side.
d. Fuse Distribution board
35 SWG re-wirable fuse is provided in both +ve & -ve sides for all individual light & fan fitting.
Each Laptop/mobile charging point is provided with 500 mA/1.0 A fuse in both +ve & -ve sides.
Emergency light circuit is provided with 6 A HRC fuse in both +ve and –ve sides.
3) What are the main components of Lead Acid Cell?
Ans. Main Components of Lead Acid Cells are:
(i) Positive Plates which are tubular in shape made of PBO2.
(ii) Negative Plates usually consists of a lead grid into which active material of Sponge lead is pressed.
(iii) Separators which are made by Synthetic used between positive and negative plates.
(iv) Container is made of hard rubber or PPCP with high insulating strength to resist acids which are used as Electrolyte.
Study Kit for Railway Recruitment Board (RRB) Exams
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Courtesy: RRB