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When a voltage of v=250 sin (314t+77/3) is applied to a series RL circuit. The
current drawn is i=25 sin (31406). Determine (1) power factor (ii) Active
Power (iii) Impedance (iv) values of R and L

A three phase star connected load consists of three identical inductive coils of
resistance 50Q and inductance 0.3H. The supply voltage is 415V, 50 Hz.
Calculate (i) phase current (ii) line current (iii) power factor (iv)total power
consumed

Derive the RMS and average values of a purely sinusoidal voltage waveform
Two wattmeters W1 and W2 are connected to measure the total power in a three
phase balanced circuit. One wattmeter reads 3600W while the second reads
backwards. On reversing the connections of the second wattmeter it is found to
read 400W. Determine the total power and power factor

Draw a neat schematic diagram of a hydro-electric power plant and explain the
functions of various components.

Draw a neat schematic diagram of a Nuclear power plant and explain its
operation.

MODULE 5
Answer any one full question, each carries 10 marks.
Explain the construction of single phase transformer.

Explain the working of single phase transformer.

Draw the connection diagram of armature and field windings in shunt, series,
and compound type DC motors. Write down the equation for field currents in
terms of line and armature currents.

A ‏عل‎ motor connected to 240۷ supply has an armature resistance 01
Calculate the armature current when back emf is 213V

MODULE 6
Answer any one full question, each carries 10 marks.
Describe the principle of operation of Split-Phase Induction Motor?

Why split-phase induction motors are most popular single- phase motors in the

market?

A 3-0 4 pole induction motor is supplied from 30 50Hz ac supply. Find
(i) synchronous speed

(ii) rotor speed when slip is 4%

(iii) the rotor frequency when runs at 600r.p.m.

Classify induction motor according to its rotor construction

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