UNIT - I : Transformers Working principle, construction and classification : Workin!J principle of transformer, Classify the various types of transformers based οη construction based οη application. Explain briefly the various parts of the transformer and explain the functions of each part. Name the different insulatin!J material used ίη transformer. Write the properties and uses of transformer oil. Explain the construction of core type and shell type transformers. Emf Equation : Derive emf equation and explain transformation ratio. Solve problem οη emf equation. Operation : Explain the operation of a transformer οη ηο load and οη load with vector diaqrams. Solve the problem οη transformer οη ηο load. Equivalent circuit : Define the equivalent resistance of a transformer as refereed to primary and secondary side. Explain maqnetic Ieakaqe ίη a transformer core. Explain Ieakaqe reactance and calculate equivalent reactance as referred to primary and secondary side. Write the formula for equivalent impedance. 1) Referred to primary 2) Referred to secondary. Draw the equivalent circuit diaqram of a transformer. Regulation and efficiency : Explain the various losses ίη a transformer. Define voltaqe requlation and efficiency in the transformer. Write equation for voltaqe requlation and efficiency. State the condition for maximum efficiency define all day efficiency. Solve the problems οη all day efficiency. Pre-determine the requlation and efficiency of 1-ph transformer by conductinq O.C. and S.C. tests. Parallel operatίon : Explain the necessity and conditions for parallel operation. Explain with neat sketches parallel operation of sinqle phase transformers with their Ioad sharinq. (Chapter - 1) UNIT - 2 : Phase Transformers Three-phase transformers : Explain workinq principle and construction of 3 phase transformers. Explain star-star, Delta-delta, Star-delta, Delta-star, Open delta and Scott connections. Coolίng of transformer : Explain the necessity of coolinq of transformer. List and explain the various types of coolinq of transformer. Write the meaninq of ΑΝ. ΟΝ. OFA. Auto transformer : Explain briefly an auto transformer. Compare auto transformer with two windinq transformer. List the application of auto transformer. (Chapter - 2) UNIT - 3 : Inductίon Motors Working principle: Explain the workinq principle of induction motor. Compare with a transformer. Explain how the rotatinq maqnetic field is produced by polyphase supply. Define the terms slip. Frequency of rotor current. Types : Describe the construction of stator, squirrel caqe rotor and phase wound rotor. Torque : Derive an expression for startinq torque. Explain the startinq torques of squirrel caqe and slip rinq induction motor. State the condition for max startinq torque. Explain the effect of chanqe ίη supply voltaqe οη startinq torque. State equation for torque under runninq conditions. Draw torque - slip curves. State relationship between - Full Ioad torque and maximum torque. Startinq torque and maximum torque. Equivalent circuit : Draw the equivalent circuit of an induction motor. Power output: State the relationship between rotor power input, Rotor copper Ioss and mechanical power developed and slips. Solve problems οη the above. (Chapter - 3) UNIT - 4 : Starting and Speed Control of Induction Motors Starting : Explain the necessity of starters for 3-phase induction motors and list the various types of starters. Explain the construction and workinq of 0.0.L. starter, Star-delta starter and auto-transformer starter. Speed control : With neat circuit diaqram. Explain the speed control of 3-ph induction motor. Chanqe of applied voltaqe, Chanqe of frequency (v'ariable voltaqe and variable frequency) and Rheostat control. (Chapter - 4) UNIT -5 : Synchronous Motors Working principle : Describe the qeneral principle of operation of synchronous motor. Compare the synchronous motor with induction motor. Operation of load : Explain the effect of chanqe ίη excitation at constant load and V-curves. Characteristics : Explain the effect of excitation οη armature current and power factor. Hunting : Explain huntinq and its prevention. Starting : Explain the methods of startinq synchronous motor. Applications : Explain the applications of synchronous motors. (Chapter - 5) UNIT - 6 : Single Phase Induction Motors Principle of operation-Double revolvinq field theory. Starting : Resistance split phase motor, Capacitor split phase motor - Capacitor start induction motor, Capacitor start and run induction motor, Shaded pole motor. Linear induction motor : Introduction, Explain the principle of workinq and characteristics of linear induction motor. Maqnetic levitation. Induction generators : Explain induction qenerators and its applications. (Chapter - 6)UNIT - I : Transformers Working principle, construction and classification : Workin!J principle of transformer, Classify the various types of transformers based οη construction based οη application. Explain briefly the various parts of the transformer and explain the functions of each part. Name the different insulatin!J material used ίη transformer. Write the properties and uses of transformer oil. Explain the construction of core type and shell type transformers. Emf Equation : Derive emf equation and explain transformation ratio. Solve problem οη emf equation. Operation : Explain the operation of a transformer οη ηο load and οη load with vector diaqrams. Solve the problem οη transformer οη ηο load. Equivalent circuit : Define the equivalent resistance of a transformer as refereed to primary and secondary side. Explain maqnetic Ieakaqe ίη a transformer core. Explain Ieakaqe reactance and calculate equivalent reactance as referred to primary and secondary side. Write the formula for equivalent impedance. 1) Referred to primary 2) Referred to secondary. Draw the equivalent circuit diaqram of a transformer. Regulation and efficiency : Explain the various losses ίη a transformer. Define voltaqe requlation and efficiency in the transformer. Write equation for voltaqe requlation and efficiency. State the condition for maximum efficiency define all day efficiency. Solve the problems οη all day efficiency. Pre-determine the requlation and efficiency of 1-ph transformer by conductinq O.C. and S.C. tests. Parallel operatίon : Explain the necessity and conditions for parallel operation. Explain with neat sketches parallel operation of sinqle phase transformers with their Ioad sharinq. (Chapter - 1) UNIT - 2 : Phase Transformers Three-phase transformers : Explain workinq principle and construction of 3 phase transformers. Explain star-star, Delta-delta, Star-delta, Delta-star, Open delta and Scott connections. Coolίng of transformer : Explain the necessity of coolinq of transformer. List and explain the various types of coolinq of transformer. Write the meaninq of ΑΝ. ΟΝ. OFA. Auto transformer : Explain briefly an auto transformer. Compare auto transformer with two windinq transformer. List the application of auto transformer. (Chapter - 2) UNIT - 3 : Inductίon Motors Working principle: Explain the workinq principle of induction motor. Compare with a transformer. Explain how the rotatinq maqnetic field is produced by polyphase supply. Define the terms slip. Frequency of rotor current. Types : Describe the construction of stator, squirrel caqe rotor and phase wound rotor. Torque : Derive an expression for startinq torque. Explain the startinq torques of squirrel caqe and slip rinq induction motor. State the condition for max startinq torque. Explain the effect of chanqe ίη supply voltaqe οη startinq torque. State equation for torque under runninq conditions. Draw torque - slip curves. State relationship between - Full Ioad torque and maximum torque. Startinq torque and maximum torque. Equivalent circuit : Draw the equivalent circuit of an induction motor. Power output: State the relationship between rotor power input, Rotor copper Ioss and mechanical power developed and slips. Solve problems οη the above. (Chapter - 3) UNIT - 4 : Starting and Speed Control of Induction Motors Starting : Explain the necessity of starters for 3-phase induction motors and list the various types of starters. Explain the construction and workinq of 0.0.L. starter, Star-delta starter and auto-transformer starter. Speed control : With neat circuit diaqram. Explain the speed control of 3-ph induction motor. Chanqe of applied voltaqe, Chanqe of frequency (v'ariable voltaqe and variable frequency) and Rheostat control. (Chapter - 4) UNIT -5 : Synchronous Motors Working principle : Describe the qeneral principle of operation of synchronous motor. Compare the synchronous motor with induction motor. Operation of load : Explain the effect of chanqe ίη excitation at constant load and V-curves. Characteristics : Explain the effect of excitation οη armature current and power factor. Hunting : Explain huntinq and its prevention. Starting : Explain the methods of startinq synchronous motor. Applications : Explain the applications of synchronous motors. (Chapter - 5) UNIT - 6 : Single Phase Induction Motors Principle of operation-Double revolvinq field theory. Starting : Resistance split phase motor, Capacitor split phase motor - Capacitor start induction motor, Capacitor start and run induction motor, Shaded pole motor. Linear induction motor : Introduction, Explain the principle of workinq and characteristics of linear induction motor. Maqnetic levitation. Induction generators : Explain induction qenerators and its applications. (Chapter - 6)
