Download JNTUK B-Tech 2020 R19 EEE Circuit Theory Model Question Paper

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[BI9EE1201]

I B. Tech II Semester (R19) Regular Examinations

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CIRCUIT THEORY

(Electrical & Electronics Engineering)

MODEL QUESTION PAPER

TIME: 3Hrs. Max. Marks: 75

Answer ONE Question from EACH UNIT.

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All questions carry equal marks.

UNIT-I

1. a). Simplify the given network by using Y-? transformation and obtain equivalent resistance across X-Y terminals. CO1 | K4 8
   
   b). Obtain the single equivalent source network across the terminals A-B make use of source transformation technique. CO1 | K3 7
   

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2. a). Explain Faraday’s Law of Electromagnetic Induction CO2 K2
   b). For the magnetic circuit shown calculate the exciting current required to establish a flux of 2 mWb in the air-gap and relative permeability of the core is 2000. Neglecting fringing and leakage flux CO2 K4
   

OR

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1. a). Write about the Analogy between Magnetic Circuit and Electrical Circuit CO2 K2
   b). For the following Circuit find V1 and V2, if L1=0.4H, L2=2.5H coefficient of coupling K=0.6 and i1=4i2=20cos(500t-200)Ma CO2 K4
   

UNIT-II

1. a). Define the following: CO3 K1
   1. Amplitude of an alternating quantity

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   2. Instantaneous value of an alternating quantity
   3. Frequency
   4. RMS value
   
   b). Two impedances, (1+j1)ohm and (1-j1)ohm are connected in parallel across a 10V source. Find the power supplied by the source. CO3 K4

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OR

1. a). An impedance of (3+j5) is connected across a 10V, 50Hz source. Find (i) power factor (ii) real and reactive power (iii) current drawn by the impedance. CO3 K1
   b). A R-L series circuit draws a current of 1A when connected across a 10V, 50Hz AC. supply. Assuming the resistance to be 5 ohms, find the inductance of the circuit. What is its power factor? CO3 K1

UNIT-IV

1. a). Define Quality factor, Band width with respect to parallel RLC circuit and draw the characteristics of parallel RLC circuit at resonance. CO4 K1
   

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   b). For the following circuit compute average power delivered to each of the passive elements. CO4 K4
   

OR

1. a). For the following circuit plot locus of the current, mark the range current for maximum and minimum values of R and maximum power consumed by circuit. Assume XL = 25 Ohm .The voltage is 200V,50Hz. CO4 K4
   
   

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   b). A series RLC circuit with R=10 Ohm, L=0.1 H and C=50 pF has an applied voltage V=50?0 with a variable frequency .Find the resonant frequency, the value of frequency at which maximum voltage occurs across the inductor and the value of frequency at which maximum voltage occurs across the capacitor. CO4 K4

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UNIT-V

1. a). Find current I in the given circuit making use of super position theorem. CO5 K3
   
   

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   b). Determine the value of R to have a maximum power transfer in the circuit shown below. Also obtain the amount of maximum power. CO5 K3
   

OR

1. a). Determine thevenin’s equivalent circuit across a-b,terminals CO5 K3
   
   

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   b). Determine the maximum power delivered to the load in the circuit shown in below fig. CO5 K2
   

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