Download SGBAU B-Tech 2nd Sem Chemical Engineering Electrical Engineering II Question Paper

Download SGBAU (Sant Gadge Baba Amravati university) B-Tech/BE (Bachelor of Technology) 2nd Sem Chemical Engineering Electrical Engineering II Previous Question Paper

B.E./ B.Tech. (Chemical Engineering) /B. Text. Second Semester (Old Course)
Electrical Engineering - II : 2 S 6
?age? ? mmumm'mmml ?'35?
Time : Two Hours . o 2 l"o . Max. Marks : 40
Notes : 1 Due credit will be given to ncamess and adequate Dimensions.
2. Assume suitable data wherever necessary.
3 Illustrate your answer necessary with the help of neat sketches.
i. a) De?ne for sinusoidal waveform 7
1) Average value
2) RM S value
3) Maximum value
4) Peak factor
b) Derive the expression for current whcn pure inductor is connected across an alternating 7
voltage. Draw the waveform and its phasor diagram.
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2. a) Derive the relationship between line voltage, phase voltage, line current and phase current 7
for a balanced delta connected load. -
b) De?ne resonance. Derive the expression for resonant frequency. 7
3. a) De?ne transformer. State its working principle. Differentiate between core and shell type 7
transformer.
13) What do you mean by ef?ciency of a transformer. Derive the condition for maximum 6
ef?ciency. ?
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4. a) With a neat diagram?explain the construction and working of ?uorescent lamp. 6
b) A 25 KVA, 3300/250V, 50 Hz single phase transfomler has iron loss of 300 watt and copper 7
losses at full load of 400 watts. Find the ef?ciency 0ftransformer at half load at 0.8 lagging
power factor. Also ?nd maximum ef?ciency.
5. a) With a neat sketch, explain the construction of dc motor. 7
b) Derive the expression for back emf of do motor. Explain the signi?cance of back emf. 6
OR
6. a) Describe the construction and working of shaded pole single phase Induction motor. 7
b) Draw a-neat diagram of three point starter and explain its working. 6
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