Guess
Paper 2nd
Branch
Electrical
Code:
302 UTILIZATION OF ELECTRICAL POWER AND
TRACTION
First question is compulsory and
attempt any 5 questions in rest off.
Q: 1 give the answer of
following:
2*5=10
A: what is traction substation?
B: why dc series motor used in traction?
C:
what is the Group and individual drives?
D: what is
illumination?
E: What is Inverse square law?
Q: 2 (A) Explain DC series motor characteristics?
2*6=12
(B) Comparison between D.C. and A.C.
systems of railway electrification form the point of view of
main line and suburban line
railway service?
Q: 3 (A) Explain Tractive effort
for propulsion of train?
(B) Explain Advantages of electrical
drives over mechanical drives? 2*6=12
Q: 4 (A) Write advantages of
electrical heating and Explain Dielectric heating? 2*6=12
(B) Which induction motor is used in following
application and why?
1.fan 2. drilling machine 3.elevators 4.
mixers
Q: 5 (A) Write Principle of
electric welding and explain Spot welding?
2*6=12
(B) Compare between resistance and arc
welding and explain carbon arc welding?
Q: 6 (A) Explain construction and
working of sodium vapor lamp?
2*6=12
(B) explain construction and working of
loco motive with diagram?
Q: 7 (A) Explain Current
collector for overhead systems?
2*6=12
(B) Drive Sag and tension calculation
for a trolley wire?
Q: 8 give short notes of any 3: 3*4=12
a. Lighting schemes for flood light
b.
negative booster
c. Factors affecting schedule speed
d. Comparison of fluorescent tubes and
filament lamps
e. Definition of crest speed, average
speed ,schedule speed, dead weight, accelerating weight and
adhesion weight
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