JNTU B.Tech II ELECTRICAL ENGINEERING Previous Question Paper (December - 2018 - R16)

Write the statements of KVL and KCL.

Define self inductance and mutual inductance.

Define Impedance and power factor.

Define real power, reactive power and apparent power.

Write Different types of DC Generators.

Explain Armature Control speed control of DC motor.

Define efficiency of transformer.

Distinguish squirrel cage and slip ring induction motor.

Describe different parts of alternators.

Define distribution span factor.

Find out the equivalent Resistance between AB terminals for the following Circuit and all Resistance values are in ohms.

Two nos. 100W, 220V bulbs are required to be connected across a 400V supply. find the value of resistance to be inserted in the line so that the voltage across the bulbs does not exceed 220V.

Briefly classify different types of instruments.

Explain Moving coil Ammeter with neat diagram.

Derive the expression for average value and RMS value from the fundamentals of sin wave.

A coil of pf 0.6 is in series with a 100µF capacitor. When connected to a 50Hz supply, the potential difference across the coil is equal to the potential difference across the capacitor. Find the resistance and inductance of the coil.

In a RLC circuit R=10 ohm, L=0.1H and C =10µF are connected in series. Find out the following: i) Resonant Frequency ii) Quality Factor iii) Band Width.

A three-phase, three-wire, ABC system, with an effective line voltage of 200 V, has three impedances of 10 at angle of 45 deg in a Delta connection. Determine the line currents and draw the voltage-current phasor diagram.

Explain principle of DC Generator and Draw constructional diagram of DC Generator.

Draw and explain the magnetization Characteristics of DC shunt generator.

Draw different characteristics of DC shunt, series and compound motors.

With circuit diagram explain the conduction of Swinburne’s test when the machine act as shunt motor.

Explain Constructional details of Single phase Transformer.

Explain OC test and SC test on single phase transformer.

Distinguish principle of operation of Squirrel cage and slip ring induction motor.

Explain slip-torque characteristics of induction motor.

Explain principle of operation of three phase alternator.

A 3ph, 50 Hz, 20 poles Salient pole alternator with star connected stator winding has 180 slots on the stator. Each slot consists of 8 conductors. The flux per pole is 25 mwb and is sinusoidally distributed. The coils are full pitched. Calculate (i) the speed (ii) the generated e.m.f per phase and (iii) the line e.m.f.