Date: December 2018

1) Question no. 1 is compulsory.

2) Answer any Three from the remaining five questions.

Find the RMS value of the waveform given below:-

Chapter: [2] A.C Circuits

State Norton’s theorem and draw the Norton’s equivalent circuit.

Chapter: [1] D.C. Circuits

In an R-L-C parallel circuit the current through the resistor, inductor(pure), and capacitor (pure) are 20A, 15A and 40A respectively. What is the current from the supply ?draw the phasor diagram.

Chapter: [2] A.C Circuits

A balanced 3 phase star connected load consists of three coils each consisting of R=6Ω and πΏπ³= 8Ω . Determine the line current , power factor when the load is connected across 400V, 50Hz, supply

Chapter: [3] Three Phase Circuits

Briefly explain the classification of DC machine.

Chapter: [5] DC Machines

Draw the phasor diagram of a single phase transformer when it is loaded with a lagging power factor load.

Chapter: [4] Single Phase Transformer

Prove that the average power taking by a pure capacitor fed with a sinusoidal ac supply in a circuit is zero.

Chapter: [2] A.C Circuits

Using the mesh analysis find the mesh current in the direction shown and also find the voltage across A and B terminals.

Chapter: [1] D.C. Circuits

A single phase transformer has 1000 turns on the primary and 200 turns on the secondary. The no load current is 3A at a power factor of 0.2 lag and the secondary current is 280A at a power factor of 0.8 lag. Neglect R_{2 }and X_{2} calculate (1) Magnetizing component and loss component of no load current. (2) primary current (3) input power factor .Draw phasor diagram showing all the currents.

Chapter: [4] Single Phase Transformer

Derive the formula for resonant frequency of the circuit with a pure capacitor in parallel with a coil having resistance and inductance. Find the expression for dynamic resistance of this parallel resonant circuit.

Chapter: [2] A.C Circuits

Find current I_{X} using Superposition theorem

Chapter: [1] D.C. Circuits

A resistance and a capacitor connected in series across a 250V supply draws 5A at 50Hz. When frequency is increased to 60Hz, it draws 5.8A. Find the values of R & C. Also find active power and power factor in both cases.

Chapter: [2] A.C Circuits

Find the node voltages π½_{π},π½_{π }πππ
π½_{π} and current through 0.5Ω

Chapter: [3] Three Phase Circuits

Describe the basic principle of operation of a single phase transformer and derive the emf equation.

Chapter: [4] Single Phase Transformer

Determine the value of R for maximum power transfer and find the value of maximum transfer.

Chapter: [1] D.C. Circuits

The OC and SC test data are given below for a single phase, 5KVA, 200V/400V, 50Hz transformer

OC test from LV side | 200V | 1.25A | 150w |

SC test from HV side | 20V | 12.5A | 175w |

Determine the following :-

1) Draw the equivalent circuit of the transformer referred to LV side.

2) At what load or KVA the transformer is to be operated for maximum efficiency?

3) Calculate the value of maximum efficiency.

4) Regulation of the transformer at full load 0.8power factor lagging.

Chapter: [4] Single Phase Transformer

#### Submit Question Paper

Help us maintain new question papers on Shaalaa.com, so we can continue to help studentsonly jpg, png and pdf files

## University of Mumbai previous year question papers Semester 1 (FE First Year) Basic Electrical and Electronics Engineering with solutions 2018 - 2019

Previous year Question paper for University of Mumbai Semester 1 (FE First Year) Basic Electrical and Electronics Engineering-2019 is solved by experts. Solved question papers gives you the chance to check yourself after your mock test.

By referring the question paper Solutions for Basic Electrical and Electronics Engineering, you can scale your preparation level and work on your weak areas. It will also help the candidates in developing the time-management skills. Practice makes perfect, and there is no better way to practice than to attempt previous year question paper solutions of University of Mumbai Semester 1 (FE First Year).

How University of Mumbai Semester 1 (FE First Year) Question Paper solutions Help Students ?

• Question paper solutions for Basic Electrical and Electronics Engineering will helps students to prepare for exam.

• Question paper with answer will boost students confidence in exam time and also give you an idea About the important questions and topics to be prepared for the board exam.

• For finding solution of question papers no need to refer so multiple sources like textbook or guides.