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Engineering FE Engineering Common Sem 1 2018 December 2018 Basic Electrical And Electronics Engineering Question Paper - Mumbai University | munotes

Basic Electrical And Electronics Engineering00055478CBSGS.pdf
HAS · 807 KB · 1 May 2025

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Questions asked in this paper

  1. Q1 Solve any three questions from the remaining Assume suitable data if required and justify
  2. Q1 State and explain superposition theorem 3 marks
    • b) Find the equivalent resistance between A & B 3
    • c) Find average value of the shown waveform 3
    • d) Explain the working of 1-phase transformer & derive its emf equation 4
    • e) Derive the condition for resonance in series R-L-C circuit 4
    • f) Write the relation between line and phase quantities in case of star connected load 3 and delta connected load
  3. Q2 a) Find the current through 10Q resistor by mesh analysis . 6 marks
    • b) A resistance is connected in series with a coil across 230V, 50 Hz supply. The 8 current is 1.8 A and voltage across the resistance and coil are 80V, & 170V respectively. Calculate the resistance and inductance of the coil & phase difference between the current and supply voltage. Draw phasor diagram
    • c) Explain open circuit test of a single phase transformer 6
  4. Q3 a) Three identical choke coils are connected as a delta load to a three-phase supply. The line current drawn from the supply is 15A and total power consumed is 7.5 KW. The KVA input is 1OKVA. Find 8 marks
    • i) Line and phase voltage
    • v) Inductance if frequency is 50 Hz
    • vi) Pf
    • b) A single phase transformer has primary voltage of 230 V, No-load primary 6 current is 5A. No-load p.f. is 0.25 of primary turns is 200 and frequency is 50Hz. calculate
    • i) Maximum flux induced in the core
    • c) Explain the use of filter in a rectifier circuit 2
    • d) Explain input characteristics of CE configuration 4
  5. Q4 a) Reduce the circuit into a single current source in parallel with single 5 marks
    • b) Draw the phasor diagram for the circuit shown. Also find the values of 7 current, and power factor
    • c) Explain the effect of power factor on wattmeter reading. 4
    • d) Explain the working of full wave bridge rectifier 4
    • b) Two impedances of + j15) Q andZ, = (6 — j8) Q are connected in 4 parallel across an ac supply. If load current supplied is 154 what is the power taken by each branch of 1.8 calculate the efficiency of the transformer at Iron loss is 1000 W
    • b) R-L circuit of 2Q and 0.01H is connected in series with a capacitor across 200V 7 mains. Maximum current flows through the circuit at frequency. What should be the value of capacitor. Also find value of current and voltage across capacitor
    • c)Show that P in a 3-phase star connected load. 6

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