Engineering FE Engineering Common Sem 1 2019 May 2019 Basic Electrical Engineering Question Paper - Mumbai University | munotes
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Questions asked in this paper
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Q2 Answer any 3 questions from the remaining 5 questions
-
Q1 any five of the following 20 marks
- (a) Explain the working principle of Single Phase Transformer
- (b) Derive the formula to convert a Star circuit into equivalent Delta
- (c) Explain the principle of operation of DC motor
- (d) What is the necessary condition for resonance in series circuit? Derive the expression for resonance frequency
- (e) Find the value of R in the following circuit
- (f) Find the current through resistor by source transformation in the
-
Q2 Determine the current through 8Q resistor in the following Network by 8 marks
- (b) An Inductive coil having inductance of 0.04H and resistance 25Q has been connected in series with another inductive coil of inductance 0.2H and resistance 15Q. The whole circuit is powered with 230V, 50Hz mains Calculate the power dissipation in eachcoil and total power factor
- (c) What are the losses in transformer? Explain why the ratings of transformer 4 in KVA not in KW
-
Q3 With necessary diagrams prove that three phase power can be measured by only two wattmeters. Also prove that reactive power canbe measured from the wattmeter reading
- (b) An alternating voltage is represented by v(t)=141.4 Sin(377t) V, Derive the 10 RMS value of the voltage
-
Q1 Instantaneous voltage value at t=3ms
- ii) The time taken for voltage to reach 70.7 V for first time and prove Maximum power transfer Theorem. 8
- (b) A SKVA 50 Hz Single phase transformer gave the following 12 1, Equivalent circuit for transformer with circuit constant
- i. Regulation at full load at 0.8 lagging
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Q11 load for maximum efficiency
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Q5 (a) Three similar coils each having a resistance of 10Q and inductance 0.04 H are connected in star across 3-phase 50Haz, 200V supply. Calculate the line current, total power absorbed, reactive colt amperes and total volt amperes 8 marks
- (b) In the following circuit find R for maximum power delivered to it. Also find
- (c) Two impedances and 10-j20Q are connected in parallel across 230V ,50Hz Single phase ac supply. Find and kVAR and Power 4
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Q6 (a) Draw and Explain the phasor diagram for the practical transformer connected to lagging power factor 6 marks
- c) State and Explain Thevenin’s theorem and Norton’s theorem 4
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