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25th February 2016, 03:42 PM
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Lingaya's University Previous Year Papers
Hello sir, I am Happy Singh. I want you to help me by providing me with the Lingya’s University previous year paper of 1st year electrical engineering. Can you help me?
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#2
25th February 2016, 03:42 PM
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Re: Lingaya's University Previous Year Papers
As you have asked about the Lingya’s University previous year paper of 1st year electrical engineering, I am giving you information about it Q-1. Part – A Select the correct answer of the following multiple choice questions. [10x1=10] (i) To determine the polarity of voltage drop across a resistor, it is necessary to know the (a) Value of resistance (b) Direction of current in the resistance (c) Value of current in the resistance (d) Value of resistance & direction of current (ii) The peak value of sine wave is 100. The rms value is (a) 70.7 (b) 50 (c) 35.35 (d) 100 (iii) The internal resistance of a circuit is 16 ohm. For maximum power transfer, the load resistance should be (a) 4 ohm (b) 6 ohm (c) 16 ohm (d) 20 ohm (iv) Open circuit test of a transformer provides (a) Copper loss (b) Core loss (c) Copper & core loss (d) None of these (v) Value of slip in an induction motor is (a) N-Ns (b) Ns-N (c) Ns (d) N (vi) Reluctance in a magnetic circuit is analogous to (a) Conductance (b) Inductance (c) Capacitance (d) Resistance (vii) A moving coil ammeter is used to measure (a) A.C. & D.C. current (b) Only A.C. current (c) Only D.C. current (d) None of these (viii) The maximum value of power factor in A.C. circuit is (a) 0 (b) 1 (c) Between 0 & 1 (d) -1 (ix) A material for permanent magnet should have (a) High retentivity (b) High permeability (c) Low hysteresis loss (d) High hysteresis loss (x) Core of a transformer is laminated to reduce (a) Hysteresis loss (b) Eddy current loss (c) Hysteresis & eddy current loss (d) Copper loss Part – B (a) State & explain Norton’s theorem. [5] (b) Derive emf equation of a transformer. [5] Section – B Q-2. (a) Draw and explain equivalent circuit of a transformer. [6] (b) Explain principle, construction & working of a transformer. [7] (c) Explain efficiency of a transformer. Derive the condition for maximum efficiency. [7] Q-3. (a) Explain the principle of operation of three phase induction motor. (b) Explain various methods of speed control of D.C. motor. [2x10=20] Q-4. (a) Explain principle, construction & working of energy meter. (b) Explain principle, construction & working of moving coil ammeter. [2x10=20 Q-5. (a) A 4700 resistor and 2 micro-farad capacitor are connected in parallel across a 240V, 60 Hertz source. Determine circuit impedance and line current. [10] (b) Determine Thevenin’s equivalent circuit which may be used to represent the given network at the terminal AB (figure – 1) and find the current in branch AB. [10] Q-6. (a) Define following:- (i) Permeance (ii) Reluctance (iii) Permeability (iii) Reluctivity (v) Magnetic field intensity [5] (b) Explain hysteresis phenomenon. [6] (c) An iron ring is composed of three sections. The cross-sectional area is 0.001 sq. m. for each section. The mean arc length are La = 0.3 m, Lb = 0.2, Lc = 0.1 m. An air gap of 0.1 mm is cut in the ring. Relative permeability for section a, b and c are 5000, 1000 and 10000 respectively. Given 0 = 4 x 10-7. Find reluctances of sections including air-gap. [9] |
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