Download SGBAU B-Tech 3rd Sem Electrical Technology Question Paper

Download SGBAU (Sant Gadge Baba Amravati university) B-Tech/BE (Bachelor of Technology) 3rd Sem Electrical Technology Previous Question Paper

B.Tech Third Semester (Chem. / Poly / Food / Pulp / Oil / Petro) (Old)
Electrical Technology : 3 SCT l
P. Pages : 2 AW - 3549Add
Time : Three Hours WIM?!? 4'.? Max. Marks : 80
Notes : 1. Answer three question from section a and three question from section B.
2. Due credit will be given to neatness and adequate Dimensions.
3. Assume suitable data wherever necessary.
4. Diagrams and chemicals equations should be given wherever necessary.
5. Illustrate your answer necessary with the help of neat sketches.
6. Use of pen Blue/Black ink/re?ll only for writing book.
SECTION - A
l. a) State and Explain superposition theorem with its examples. 7
b) Find the current ?owing at the instant of switching 60 W lamp on 240 V d. c supply. Given 6
that ?lament temperature is 2000 ?C and resistance temperature coef?cient at 0?C is 0.005
per 0?C. Assume temperature of switching is 0?C.
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2. a) Determine the current in 2052 resistor of the network shown by Thevenin's theorem. 7
b) De?ne current, voltage and EMF. & Derive the relationship between work, power and 6
energy.
3. a) Prove that the cunent ?owing through the Purely resistive circuit is in phase with the applied 7
voltage. Also calculate the average power.
b) Explain the generation of a. c. quantity in single phase a. c. circuit. 6
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4. a) What is electromagnetic Induction: Explain self induced emf and mutually induced emf. 7
b) Two coils having 100 and 1000 turns having common magnetic circuits of 25 cm and cross 6
section area 6.25 cmz, permeability of 2000. Calculate
i) Self inductance of two coils
ii) Mutual inductance between them if coef?cient of coupling is 0.5
AW - 3549Add 1 P.T.O

5. a)
b)
6. a)
b)
7. a)
b)
8. a)
b)
9. a)
b)
10. a)
b)
11. a)
b)
12. a)
b)
AW - 3549Add
Compare the electric circuit and magneuo circuit with its similarities and dissimilaritics.
Den?ve the emf equation Ofsingle phase transformer.
OR
Explain principle, construction and working of single phase transformer.
De?ne the following terms related to magnetic circuit.
i) Permeability ii) Absolute permeability
iii) Relative permeability iv) Reluctance
v) Pcrmeance vi) MMF.
SECTION - B
Derive the relationship between line voltage, phase voltage, line current and phase current
for 3 phase, 4 wire system.
Explain in detail the classi?cation of measuring Instruments.
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De?re the following terms related to three phase a. c. circuit.
i) Phase ii) Phase sequence
iii) Symmetrical system iv) Balanced load
v) Unbalanced load vi) Balanced system.
Explain principle, construction and wurking ot?repulsion type moving Iron Instrument.
State its advantages.
Explain the principle, construction and working of single phase induction motor. State the
types of single phase induction motor.
Explain the three point staner 0f dc motor with neat sketch.
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State the classi?cation of d. c. motor. Also state the application of d. c, motor for each type.
What are the types of single phase induction motor. Explain anyone.
Explain types of wires & cables in detail.
What are the safety precautions taken. While working with electricity.
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Expgain principal, construction and working 0f fluorescent lamp.
Compare the various systems of wiring in detail.
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