JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II ELECTRICAL CIRCUITS Previous Question Paper (April/May - 2018 - R15)

Define the Independent and Dependent Sources. How they are classified?

What is meant by Super Mesh?

Define the R.M.S. value of a periodic waveform.

What is the significance of J-operator? What are the different forms of expressing the sinusoidal quantity in complex form?

What is the need of locus diagrams?

State the Faraday’s laws of electromagnetic induction.

Write the Definition of Graph and Tree.

What is the procedure for constructing the dual network of a given network?

Write the procedure to verify the superposition theorem.

State the Nortons theorem.

By using voltage division rule find the voltage V1 in the circuit shown in figure 2.

Two resistances of 50Ω and 40Ω respectively are connected in parallel. A third resistance of 10Ω is connected in series with the combination and a D.C supply of 220 V is applied to the ends of the completed circuit. Calculate the current in each resistance.

A coil of insulated wire of resistance 8Ω and inductance 0.003H is connected to an a.c. supply at 240 V, 50 Hz. Calculate (i) the current, p.f and the power, (ii) the value of capacitance which when connected in series with the above coil, causes no change in the values of the current and power taken from the supply.

How do you obtain the power factor and power factor angle from (i) Impedance triangle (ii) Admittance triangle (iii) kVA triangle?

A resistance of 50Ω, an inductance of 0.15H and a capacitance of 100µF are connected in parallel across a 100V, 30Hz supply. Calculate (i) the current in each circuit (ii) the resultant current and (iii) the phase angle between the resultant current and the supply voltage. Draw the phasor diagram.

Compute the RMS and average values of square wave form shown in figure 3.

Derive the expression for band width of RLC series circuit.

Self-inductance of two coupled coils are L1 = 10×10^-3 H and L2 = 20×10^-3 H. The coefficient of coupling (K) being 0.75 in the air, find voltage in the second coil, and the flux of first coil, Provided the second coil has 500 turns and the circuit current is I1 = 2 sin 314t A.

Explain the procedure to draw the locus diagram of R-C series circuit when ‘C’ is varying.

A mild steel ring has a mean circumference of 600mm and a uniform cross-sectional area of 350 mm^2. Calculate the MMF required producing a flux of 600 µWb when an air gap of 1mm length is now cut in ring. Also determine the flux produced if MMF remains constant. Given relative permeability of mild steel is 1200.

Illustrate the super mode analysis with an example.

Find the branch current as shown in following figure 4 by using the concept of tie-set matrix.

Using nodal analysis technique to determine current ‘I’ in the network shown in figure 5.

For the network shown in figure 6 determine all branch current and the voltage across the 6Ω resistor by loop current analysis.

State and explain compensation theorem.

For the network shown in Figure 8 verify Tellegen’s theorem.