ASSIGNMENT
CHAPTER: 1
Q: 1 Explain the need of parallel operation of transformers. State and explain the condition for
parallel operation of three phase transformer.
Q: 2 Why cooling of transformer is needed? Explain the different methods of cooling of transformer.
Q: 3 State and explain different accessories of Transformer.
Q: 4 Draw and explain Buchholz relay.
Q: 5 Draw the connection of three phase transformer given below.
1) Dy1 2)Yd1 3)Yd11 4)Dd6 5)Yy0 6)Dy11
CHAPTER: 2
Q: 1 Explain how rotating magnetic field is produced when a three phase supply is given to three
phase induction motor.
Q: 2 State the two types of three phase induction motor and explain the difference between two
clearly.
Q: 3 Explain the working principle of three phase induction motor. OR How does rotor rotates in an
Induction motor?
Q: 4 Explain the term ‘Slip’ of an induction motor. Explain the effect of slip on the frequency of rotor
induced e.m.f.
Q: 5 Derive the torque equation for three phase Induction motor at starting and explain the
condition for maximum starting torque.
Q: 6 Derive the torque equation for three phase Induction motor under running condition and
explain the condition for maximum running torque.
Q: 7 Explain the different parts of three phase Induction motor.
Q: 8 Draw and explains the Torque – Slip characteristic of an Induction motor. Show the effect of
rotor resistance on the characteristic.
Q: 9 Explain the construction of three phase slipring Induction motor with the help of neat diagrams.
Q: 10 Why the three phase Induction motor draw a heavy current at starting? List the different types
of starters used for three phase Induction motor. Explain any one with sketch.
Q: 11 Draw and explain the equivalent circuit of a three phase Induction motor and derive equation
RL = R2 ( 1/s-1).
Q: 12 Explain the speed control of Induction motor by Kramer’s method with diagram or cascade
method with sketch.
Q: 13 Explain how will you draw a circle diagram from No load and Blocked rotor test reading. State
the different information available from circle diagram. OR Show that the locus of the rotor
current of three phase induction motor is semi circle.
Q: 14 Explain various losses occurring in Induction motor and various power stages.
Q: 15 Establish relation among rotor input, slip and rotor output.
Q: 16 Explain the construction of double cage Induction motor. State the advantages of this motor
compared to Induction motor.
Q: 17 Explain the submersible motor.
Q: 18 Explain Linear Induction motor.
Q: 19 Explain the term “Crawling” and “cogging” related to three phase induction motor.
CHAPTER: 3
Short Questions:
Q: 1 List the main parts of the Alternator.
Q: 2 Define voltage regulation
Q: 3 List the different methods of Voltage regulation
Q: 4 Need of parallel operation of Alternator.
Q: 5 List the advantages of cooling of Alteranator.
Long Questions:
Q: 1 State the difference between the fixed field - rotating armature and Fixed armature- rotating
field type alternator.
Q: 2 Obtain the EMF equation of Alternator.
Q: 3 Explain the armature reaction of Alternator.
Q: 4 Explain the Ampere turn method of finding regulation of Alternator.
Q: 5 Explain the method of synchronizing the alternator on infinite busbar.
Q: 6 State the application of Alternator.
CHAPTER: 4
Short question:
Q:1 Write the features of synchronous motor.
Q: 2 Write the advantages of synchronous motor.
Q: 3 Write the disadvantages of synchronous motor.
Q: 4 Why synchronous motor is a constant speed motor.
Long Question:
Q: 1 Explain the construction of synchronous motor.
Q: 2 Explain the working principle of synchronous motor.
Q: 3 Draw the power stages of synchronous motor.
Q: 4 State different methods of starting synchronous motor and explain any one method.
Q: 5 Explain hunting in synchronous motor explain how the effect of hunting can be reduced.
Q: 6 What is V curve in synchronous motor? Explain the method of obtaining V curve in the
laboratory.
Q: 7 State the applications of synchronous motor.
Q: 8 Compare induction motor and synchronous motor.
CHAPTER: 5
Q: 1 Why single phase induction motor is not self starting? How to make it self starting.
Q: 2 Explain Shaded pole Single phase IM.
Q: 3 Explain Capacitor start capacitor run Induction motor.
Q: 4 Write Application of single phase induction motor.