Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2016-17 EEE801 Utilization Of Electrical Energy And Traction Question Paper
B.TECH.
THEORY EXAMINATION (SEM?VIII) 2016-17
UTILIZATION OF ELECTRICAL ENERGY & TRACTION
Time : 3 Hours Max. Marks : 100
Note : Be precise in your answer. In case Ofnumerical problem assume data wherever not provided.
SECTION ? A
1. Attempt the following: 10 x 2 = 20
a) What are the advantages of electric heating ?
b) Write the Stefan?s law of heat radiation and label all constants.
c) Why alternating current is found most suitable for resistance welding ?
d) What is meant by welding electrode.
e) The ?ux emitted by a lamp in all directions is 10001umens. Calculate its MSCP.
f) What is ?ood lighting ?
g) Why single phase system is preferred for main line railway service ?
h) What is meant by speed-time curve ?
i) Why a do series motor is ideally suited for traction purposes?
j) Traction motors are given one?hour rating as well as continuous rating ?
SECTION ? B
2. Attempt any five parts of the following question: 5 x 10 = 50
a) Explain the role of ignition contractor in welding process. What are its
advantages over mechanical switches ?
b) Describe the principle of electro deposition in electrolyte process.
c) A worn out shaft of 10 cm. diameter and 25 cm. long is to be coated with 2 mm
thick layer of nickel. Determine the quantity of electricity required and time taken
if current density of 160 amp./sq. meter is adopted. Assume current efficiency of
90%. Density of nickel may be taken as 8.9 gm/c.c.
(1) Draw and explain general speed-time curve of a train running between two
stations. How can this curve be approximated for (a) main line service (b)
suburban service ?
e) Explain various functions Traffic effort exerted by traction unit is supposed to
perform and derive and expression for total tractive effort.
f) A locomotive Of 100 tonnes can just accelerate train of 500 tonnes with an
acceleration of l kmphps up gradient of 10%. Adhesive weight of locomotive is
70% of total dead weight, tractive resistance 45 newtons/tonne and inertia 10%.
If this locomotive is helped by another locomotive of 130 tonnes with 100%
adhesive weight, find out :
(i) Trailing weight that can be hauled up the same gradient under same
conditions.
(ii) The maximum gradient,trailing hauled load remaining unchanged.
g) Explain laws of illumination and also describe various factors to be considered
for good lighting.
h) Describe in detail functioning of Window air conditioner
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Attempt any two questions of the following: 2 x 15 = 30
Discuss various features of the electric supply system which have bearing on the drive.
Explain working of a Diesel Engine Driven d.c. Generating Feeding d.c. series motors system.
An electric train weighing 500 tonnes climbs up?gradient with G = 8 and following speed-time
curve :
(i) uniform acceleration of 2.5 km/hr/sec. for 60 sec.
(ii) Constant speed for 5 min.
(iii) Coasting speed for 3 min.
(iv) Dynamic breaking at 3 kmphps to rest.
The train resistance is 25 N/tonne, rotational inertia effect 10% and combined efficiency of
transmission and motor is 80%. Calculate the specific energy consumption.
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This post was last modified on 30 January 2020