ELECTRICAL MACHINES-II
II/IV B.TECH II-SEMESTER
UNIT-I:
1. Explain the
Constructional Details of Transformer?
2. Explain working
principle of Transformer and also write the applications
Of Transformers?
3. Derive the EMF Equation of the Transformer?
4. Explain why hystersis and eddy current losses
occurs in a transformer?
UNIT-II:
1. What are the advantages and disadvantages of
autotransformers?
2. Draw the phasor diagrams corresponding to parallel
operation of transformers
With equal voltage
ratio?
3. Draw the phasor diagrams corresponding to parallel
operation of transformers with
Un-equal voltage
ratio ?
4. Explain why open circuit test is conducted on
transformer. Give related
Calculations
5. Explain why short circuit test is conducted on
transformer. Give related
Calculations
UNIT-III:
1.
List out the advantages and disadvantages of a bank of 3, 1-phase transformers
to single 3-phase transformers.
2.
Explain the function of center-tapped reactor in on load tap changer.
3.
With neat phasor diagram, explain the voltage regulation of three-phase
transformer.
4.
Discuss in detail the effect of
i. current harmonics,
ii. Voltage harmonics on the performance
of three phase transformers.
UNIT-IV:
1. Does the induction motor have
any similarities with the transformer? Compare
the similarities and differences between
them.
2. Show that a rotating magnetic field is
produced in the air-gap, when a balanced
Three-phase ac supply is given to the
stator of a 3-phase induction motor. Justify
Your claim with necessary mathematical
equations
3. With the help of neat sketch,
explain the constructional features of a
three-phase induction motors.
4. Explain
the differences between sq. cage IM & Slip ring IM.
UNIT-V
1. Explain the torque development process in an induction
motor and its dependence
on rotor slip
2. Draw and explain the phasor diagram of 3-phase induction
motor.
3. Discuss the phenomenon of crawling in an induction motor
4. Discuss the phenomenon of cogging in an induction motor
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