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D5824 Pages: 2

What are instrument transformers? Give its types.

With neat sketch, explain the development of rotating magnetic field in a three-
phase induction motor.

Define slip and draw the torque slip characteristics of a three-phase induction
motor.

A three phase induction motor has 2 poles and is connected to 400 V, 50 hz supply.
Calculate the actual rotor speed and rotor frequency when slip is 4%.

Draw the equivalent circuit per phase of a three-phase induction motor and explain.
A 40 KW 6 pole three phase induction motor delivers full load output at 950 rpm at
0.85p.f when connected to a 500 volt, 50 hz supply. Friction and windage losses
equals 1.5K W and stator losses are 1.8K W. Determine for this load:

i) Total copper loss 11) Efficiency.

PART C
Answer any four full questions, each carries 10 marks

Describe principle of working of single phase induction motors with neat sketches.
With suitable graphs explain the method to determine voltage regulationof an
alternator by EMF method.

Derive the emf equation of an alternator.

Write a note on the starting of synchronous motors.

Draw and explain the ‘V’ curves of a synchronous motor.

A three-phase star connected alternator is rated at 1600 KVA, 13500 Volt. The
armature resistance and synchronous reactance are 1.5 and 30 ohms respectively
per phase. Calculate the percentage voltage regulation for a load of 1820 KW at 0.8
leading p.f.

What are universal motors? Explain their working.

Define distribution factor and pitch factor of an alternator.

Draw the schematic diagram of a variable reluctance motor and explain its
working.

What is micro stepping? Determine the step angle of a variable reluctance stepper
motor with 12 teeth in stator and 8 rotor teeth.

Draw the stepper motor characteristics and explain. Also list the applications of
stepper motors.

With suitable block diagrams explain the control of stepper motors.

Give the two major classification of general control systems and explain them with
suitable block diagrams. Give examples for each type.

Wnite a note on different types of controllers for automation.
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