Engineering FE Engineering Common Sem 1 Basic Electrical and Electronics Engineering Dec 2019 R16 Question Paper - Mumbai University | munotes

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Questions asked in this paper

Q1 Answer any five
- (i) Firid value of R3 in the figure given below by applying Kirchhoff’s laws. 4
- (ii) Briefly describe the operation of any one type of stepper motor. 4
- (iii) Two pure circuits elements in a connection have the following current 4 and applied voltage: v(t) = 150 sin V, i(t) = 13.42 sin A Find the supply frequency (in Hz) and the value of circuit elements load with per phase impedance of 20L ohms. the line current drawn and active power taken by the load
- (v) Draw the phasor diagram of a single phase non ideal transformer feeding a 4
- vi) Single phase induction motor is not self-starting. State True or False and Justify 4
Q2 (A) Find the current through 5Q (Ix) using Superposition theorem without using 10 marks
- (B) State and prove Maximum Power Transfer theorem. 05
- (C) Plot the variation of current, impedance, resistance, inductive reactance and 05 capacitive reactance when supply frequency is varied in R-L-C series circuit
Q3 (A) The Open Circuit (OC) and Short Circuit (SC) tests on a 5 KVA, 200/400 V, 50. Hz, single phase transformer gave the following results OC: 200 V, 1 A, 100 W (lv side), SC: 15 V, 10 A, 85 W (hv side). Draw the equivalent circuit referred to primary and put all values 10 marks
- (B) Derive the EMF equation of a de motor. 05
- (C) the Root Mean Square (RMS) value of the following waveform. 05
Q4 (A) With neat circuit diagram and phasor diagram, prove that by two watt meter active power and reactive power of a three phase load can be measured 10 marks
- (B) A sinusoidal voltage is applied to a series R-L-C circuit with R = 20 Q, /.=100 mH, and C =10 pF. Find the resonant frequency, (ii) RMS value of 19 current at resonance (iii) Quality factor of the circuit, (iv) voltage across the inductor at resonant frequency and (v) phasor diagram at
- (A) Derive the transformation formula to convert a delta network of resistors toan 10 star network and star network of resistors to an equivalent delta network
- (B) In the parallel circuit, voltmeter across 3 Q resistor reads 45 V. What is the on the ammeter? Also find the input power factor 4B678D8F74E0DDBA0CE90F29C2D26A IF
Q6 (A) Find current through 5Q from A to B using Thevenin’s theorem. 10 marks
- (B) A 20 KVA Transformer has iron loss of 450W and full load copper loss of 05 900W. Assume power factor of load as 0.8 lagging. Find full load and half load efficiciicy of the transformer
- (C) Briefly explain the principle of operation of three phase Induction motor. What 05 are the types of three phase Induction motor?

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