--- Content provided by FirstRanker.com --- b) Define Active and Passive elements.
c) Define RMS value of an alternating quantity.
d) Define Power factor.
e) Define Transformation ratio of a transformer.
f) List the different losses in a transformer.
h) What are the different types of single-phase induction motors?
i) Write any two applications of DC generators.
j) What is the necessity of earthing?
c) Define RMS value of an alternating quantity.
d) Define Power factor.
e) Define Transformation ratio of a transformer.
f) List the different losses in a transformer.
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g) Define slip of an induction motor.h) What are the different types of single-phase induction motors?
i) Write any two applications of DC generators.
j) What is the necessity of earthing?
PART-B (5 x 10 = 50 Marks)
UNIT-I
- a) State and explain Kirchhoff’s Laws. (5M)
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b) For the circuit shown in the figure, find the current supplied by the source. (5M)
- a) Define and explain Star and Delta connected networks. (5M)
b) Determine the equivalent resistance between the terminals A and B for the network shown in the figure. (5M)--- Content provided by FirstRanker.com ---
OR
UNIT-II
- a) Define average value and RMS value of an alternating quantity. (5M)
b) A sinusoidal voltage of V=200sin(314t) is applied to a series RL circuit where R=10Ω and L=0.02H. Find the RMS value of current drawn from the source and also its phase angle. (5M) - a) Explain the concept of impedance, reactance and admittance. (5M)
b) A series RLC circuit with R = 10Ω, L = 0.05H and C = 50µF is supplied with a 230V variable frequency supply. Find the frequency at which the circuit will be in resonance condition and also find the current flowing through the circuit at resonance. (5M)
OR
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UNIT-III
- a) Explain the working principle of a single-phase transformer. (5M)
b) A 200 kVA, 3300/240 V, 50 Hz single phase transformer has 90 turns on the secondary winding. Calculate the number of turns on the primary winding, primary and secondary full load currents. Neglect losses. (5M) - a) Derive the EMF equation of a single-phase transformer. (5M)
b) Explain the constructional details of a transformer. (5M)
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OR
UNIT-IV
- a) Explain the working principle of a three-phase induction motor. (5M)
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b) A 6-pole induction motor is fed by a 50 Hz supply. If the full load speed is 970 rpm, determine slip. (5M) - a) Explain the constructional details of a three-phase induction motor. (5M)
b) Explain the torque-slip characteristics of a three-phase induction motor. (5M)
OR
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UNIT-V
- a) Explain the working principle of a DC generator. (5M)
b) Explain different types of DC generators with neat diagrams. (5M) - a) Explain different types of earthing. (5M)
b) Explain the working principle of Fuse and MCB. (5M)
OR
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