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Dr. Babasaheb Ambedkar Technological University, Lonere — Raigad, 402103
Summer Semester Examination, May 2018
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B. Tech. Semester: I
Subject: Basic Electrical Engineering
Date: 21/05/2018
Time: 3 Hrs.
Max. Marks: 60
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Instructions to Students:
- Attempt any FIVE questions.
- Illustrate your answers with neat sketches, diagrams etc., wherever necessary.
- If some part or parameter is found to be missing, you may assume it and mention it clearly.
Q.1)
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a) Explain the Effect of Temperature on Resistance. (6M)
b) Using Nodal Analysis, find the current through 2O resistor. (6M)
Q.2)
a) A pump is required to lift 900 kg of water per minute through 7 m height at an overall efficiency of 39%. Calculate the input power to motor. If pump is operated for 4 hours a day, calculate the energy consumption in kW-hr for 30 days. (6M)
b) Define the following: (6M)
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Q.3)
a) Define the following: (6M)
b) Derive the equations for Average & RMS value of sinusoidal waveform. (6M)
Q.4)
a) Explain the R-L series circuit with waveform & draw its phasor diagrams. (6M)
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b) A coil having a resistance of 10 O and inductance of 0.2 H, is connected to a 100 V, 50 Hz supply. Calculate the impedance of the coil, the current and applied voltage. (6M)
Q.5)
a) Explain the Energy Stored in a Magnetic field and give its expression. (6M)
b) Explain the Faraday’s laws of Electromagnetic Induction and also explain Fleming’s Right hand rule for deciding the direction of Induced EMF. (6M)
Q.6)
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a) Explain the Construction of Transformer with a neat diagram. (6M)
b) Efficiency of 400 kVA single phase transformer is 98.77 % at full load, 0.8 power factor and it is 99.13 % at half load unity power factor. Determine: (6M)
i) Iron Losses ii) Full Load Copper Losses
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