Induction Motors and AC Machines

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What is the main reason for keeping the air gap as small as possible in a three-phase induction machine?

To increase the magnetizing current
To keep the magnetizing current low (correct)
To increase the power consumption
To reduce the starting torque

What is the purpose of the slots in the stator of a three-phase induction machine?

To accommodate the three-phase windings (correct)
To reduce the number of phases
To increase the air gap
To accommodate the rotor

What is the name of the part of the induction machine that rotates?

Stator
Air gap
Rotor (correct)
Magnetizing current

What is the main advantage of using power electronic converters as a supply source for an induction machine?

To augment the characteristics of the machine (D) Signup and view all the answers

What is the primary reason for the widespread use of induction machines in industries and household applications?

They offer several advantages, including being cheap and rugged (D) Signup and view all the answers

What is the percentage of total electrical energy generated that is consumed by induction machinery?

60% (B) Signup and view all the answers

What is unique about the starting process of an induction machine?

It is self-starting (B) Signup and view all the answers

What is the characteristic of an induction machine that allows it to run at almost constant speed from no-load to full-load condition?

It is maintenance-free (C) Signup and view all the answers

What is the purpose of short-circuiting the rotor winding through external resistance?

To improve the performance of the motor (C) Signup and view all the answers

What type of machine is used for high-power applications (MW range)?

Wound rotor induction motor (D) Signup and view all the answers

What is the purpose of the three copper rings called 'slip rings' on the rotor shaft?

To connect the rotor winding to the external resistance (B) Signup and view all the answers

What is the spatial phase difference between the three-phase stator windings?

120∘ (A) Signup and view all the answers

What is the principle of operation of a three-phase induction motor based on?

Faraday's law of electromagnetic induction (D) Signup and view all the answers

What is the result of supplying a balanced three-phase supply to a three-phase stator winding?

A rotating magnetic field (B) Signup and view all the answers

What is the requirement for the rotor winding in a wound rotor induction motor?

It should be short-circuited (D) Signup and view all the answers

What is the application of a wound rotor induction motor in wind energy generation?

As a generator (B) Signup and view all the answers

What are the two types of rotor structures?

Squirrel cage and slip ring (C) Signup and view all the answers

What are the slots in the stator lamination used for?

To accommodate three-phase windings (A) Signup and view all the answers

What is the advantage of using open slots in stator design?

Lower leakage reactance (C) Signup and view all the answers

What is the shape of the squirrel cage rotor?

Skewed (D) Signup and view all the answers

What is the purpose of the end rings in a squirrel cage rotor?

To short the copper or aluminum bars (D) Signup and view all the answers

What is the characteristic of the construction of a squirrel cage rotor?

Rugged and strong, requiring no maintenance (C) Signup and view all the answers

What is the similarity between a wound rotor and a stator?

Both have three-phase windings (C) Signup and view all the answers

How are the three-phase windings in a stator connected?

Either in star or in delta (C) Signup and view all the answers

Induction Motors and AC Machines

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Questions and Answers

What is the main reason for keeping the air gap as small as possible in a three-phase induction machine?

What is the purpose of the slots in the stator of a three-phase induction machine?

What is the name of the part of the induction machine that rotates?

What is the main advantage of using power electronic converters as a supply source for an induction machine?

What is the primary reason for the widespread use of induction machines in industries and household applications?

What is the percentage of total electrical energy generated that is consumed by induction machinery?

What is unique about the starting process of an induction machine?

What is the characteristic of an induction machine that allows it to run at almost constant speed from no-load to full-load condition?

What is the purpose of short-circuiting the rotor winding through external resistance?

What type of machine is used for high-power applications (MW range)?

What is the purpose of the three copper rings called 'slip rings' on the rotor shaft?

What is the spatial phase difference between the three-phase stator windings?

What is the principle of operation of a three-phase induction motor based on?

What is the result of supplying a balanced three-phase supply to a three-phase stator winding?

What is the requirement for the rotor winding in a wound rotor induction motor?

What is the application of a wound rotor induction motor in wind energy generation?

What are the two types of rotor structures?

What are the slots in the stator lamination used for?

What is the advantage of using open slots in stator design?

What is the shape of the squirrel cage rotor?

What is the purpose of the end rings in a squirrel cage rotor?

What is the characteristic of the construction of a squirrel cage rotor?

What is the similarity between a wound rotor and a stator?

How are the three-phase windings in a stator connected?

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Choose a study mode

Podcast

Questions and Answers

What is the main reason for keeping the air gap as small as possible in a three-phase induction machine?

What is the purpose of the slots in the stator of a three-phase induction machine?

What is the name of the part of the induction machine that rotates?

What is the main advantage of using power electronic converters as a supply source for an induction machine?

What is the primary reason for the widespread use of induction machines in industries and household applications?

What is the percentage of total electrical energy generated that is consumed by induction machinery?

What is unique about the starting process of an induction machine?

What is the characteristic of an induction machine that allows it to run at almost constant speed from no-load to full-load condition?

What is the purpose of short-circuiting the rotor winding through external resistance?

What type of machine is used for high-power applications (MW range)?

What is the purpose of the three copper rings called 'slip rings' on the rotor shaft?

What is the spatial phase difference between the three-phase stator windings?

What is the principle of operation of a three-phase induction motor based on?

What is the result of supplying a balanced three-phase supply to a three-phase stator winding?

What is the requirement for the rotor winding in a wound rotor induction motor?

What is the application of a wound rotor induction motor in wind energy generation?

What are the two types of rotor structures?

What are the slots in the stator lamination used for?

What is the advantage of using open slots in stator design?

What is the shape of the squirrel cage rotor?

What is the purpose of the end rings in a squirrel cage rotor?

What is the characteristic of the construction of a squirrel cage rotor?

What is the similarity between a wound rotor and a stator?

How are the three-phase windings in a stator connected?

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