STUPIDSID
Solve any one question from Q.1(a,b,c) & Q.2(a,b,c)
1(a)
Describe construction and working of Ajaxwyatt furnace.
6 M
1(b)
Explain construction and working of Limit switch and Push button.
6 M
1(c)
Estimate the number and wattage of lamps which would be required to illuminate a workshop space 60×15 meters by mean of lamps mounted 5 meter above the working plane. The average illumination required about 100lux, coefficient of utilization is 0.4, luminious efficiency is 16 lumens/ watt. Assume specific height ratio of unity and candle power depreciation of 20%.
8 M
2(a)
Explain electric circuit used in Refrigerator.
6 M
2(b)
Explain Mercury vapour lamp.
6 M
2(c)
An insulating slab of 2 cm thick and 150 cm2 in area is to be heated by dielectric heating. The power required is 220 watts at a frequency of 32 Mhz. The material has relative permittivity of 5 and power factor of 0.06. Determine the voltage necessary for heating and the current flowing through the material. Also calcualte frequency to obtain the same heating if the voltage is limited to 620 volt.
8 M
Solve any one question from Q.3(a,b) & Q.4(a,b)
3(a)
Explain function of Transformer and Interrupter used in traction substation.
8 M
3(b)
How electric traction will be advantageous.
8 M
4(a)
Draw and explain block diagram of electric locomotive.
8 M
4(b)
Explain following systems of track electrification
i) Three phase low frequency AC system.
ii) Single phase AC to DC system.
i) Three phase low frequency AC system.
ii) Single phase AC to DC system.
8 M
Solve any one question from Q.5(a,b) & Q.6(a,b)
5(a)
Draw Trapezoidal speed-time curve and obtain expression for maximum velocity.
8 M
5(b)
A schedule speed of 45 kmph is required between two stops 1.5km apart. Find the maximum speed over the run if the stop is of 20 sec duration. Acceleration and retardation are 2.4 kmphps and 3.2 kmphps respectively. Assume trapezoidal speed-time curve.
8 M
6(a)
Define:
i) Average Speed
ii) Schedule speed
iii) Coefficient of adhesion
iv) tractive effort
i) Average Speed
ii) Schedule speed
iii) Coefficient of adhesion
iv) tractive effort
8 M
6(b)
Elaborate the parts of total tractive effort with usual notations.
8 M
Solve any one question from Q.7(a,b,c) & Q.8(a,b,c)
7(a)
Write a note on Anti-collosion system.
4 M
7(b)
What are the desirable characteristics of motor for traction purpose.
6 M
7(c)
A2340 tonnes train including loco proceeds down a gradient of 1 in 80 for 5 minutes during which period its speed gets reduced from 60 kmph to 36 kmph by application of regenerative braking. Find the energy returned to lines if the tractive resistance in 5kg/tonne, rotational inertia 10% and overall efficiency of the motor during regeneration is 70%.
8 M
8(a)
How Three phase Induction motor is suitable for traction service.
4 M
8(b)
Explain transition methods with neat diagram.
6 M
8(c)
A rain weighing 400 tonne has speed reduced by regenerative braking from 40 kmph to 20 kmph over a distance of 2 kmon a down gradient of 2%. Calculate the electrical energy returned to the line. Tractive resistance is 40N/tonne and allow rotational inertia of 10% and efficiency of conversion is 75%.
8 M
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