Jawaharlal Nehru Technological University Hyderabad B.Tech II PRINCIPLES OF ELECTRICAL ENGINEERING Previous Question Paper (April/May - 2023 - R13)

Define Time Constant of R-L circuit under transient conditions.

How a charged capacitor behaves in initial condition?

Define symmetry condition in terms of z and y parameters.

Define impedance parameters.

What an attenuator does?

What is the characteristic impedance in pass band?

What the field does in DC machines?

What are the losses in DC machines?

Define magnetizing current.

How voltage, current and power change in step up transformer?

Derive the expression for the source current in a series RL circuit excited by DC voltage source at t = 0 using Laplace transform approach.

Using Laplace transform, derive the expression for current ‘i’ in the circuit (Figure 1) below. Using the expression find the current ‘i’ at t = 3 sec.

Derive the expression for the voltage across resistor in a series RLC circuit excited by DC voltage source at t = 0 using Laplace transform approach.

Using Laplace transform, derive the expression for current ‘i’ in the circuit (Figure 2) below. Using the expression find the current ‘i’ at t = 5 sec.

Derive the expressions for impedance parameters in terms of transmission parameters.

Determine the hybrid parameters of the following two port network (Figure 3).

Derive the expressions for admittance parameters of a network resulted from the interconnection of two individual networks in series.

Determine the impedance parameters of the following two port network (Figure 4).

Give the detailed Classification of filters.

Explain in detail about lattice attenuator with neat sketch.

Describe constant-k low pass filter in detail.

What are the differences between band pass and band elimination filters? Explain.

Explain the principle of working of DC generator in detail.

Discuss about different types of DC motors in detail.

Draw the magnetization characteristics of DC shunt generator and explain.

With the help of neat sketch, describe Swinburne’s test.

Explain the principle of working of single phase transformer in detail.

A 50 kVA, 2200/110 V, single phase transformer when tested gave the following results: OC test, measurements on the LV side: 400 W, 10 A, 110 V; SC test, measurements on the HV side: 808 W, 20.5 A, 90 V. Compute all the parameters of the equivalent circuit referred to the LV side of the transformer.

Explain the working of stepper motors in detail.

A single-phase transformer is rated 300/200 V, 5 kVA, 50 Hz. The transformer is supplying half load on secondary side at 0.9 pf lagging. What is the load impedance? Assuming the transformer to be ideal, Calculate the primary seen impedance, primary current and primary power factor.