WorksheetsAC Machines
Total questions: 15
Worksheet time: 8mins
3-Phase Induction motor will have ____ power factor during no load condition:
High
Negative
Low
Moderate
Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor:
DOL Starter
Rotor Resistance Starter
Line Resistance Starter
Auto Transformer Starter
Star Delta Starter
The rotor slots of 3-Phase Induction Motor are kept inclined inorder to reduce noise, vibrations and synchronous cusps. This phenomenon in known as:
Plugging
Cogging
Crawling
Skewing
3-Phase Induction Motor will have ____ Starting Torque and _____ Starting Current
Low, Low
High, High
Low, High
High, Low
What happens when Induction motor runs at synchronous speed, motor will:
Delivers real Power
Stops
Burn
Delivers Reactive Power
3-Phase Induction Motor has the advantage of Low Cost, Less Maintenance and Rugged Construction:
True
False
Crawling occurs in Induction Motor due to which of the following:
Harmonics
Low Voltage
High Voltage
Over Load
A single Phase Induction motor is self starting
True
False
In large synchronous machine, field winding is placed on ______ and ac supply on ______
Rotor, Stator
Armature, Slots
Stator, Rotor
pole shoes, stator
Which is called optimistic Method?
EMF Method
ZPF Method
ASA Method
MMF method
Which alternator is used for high speed applications?
Saleint pole
Slip Ring
Squirrel Cage
Cylindrical pole
Which factor is not considered for synchronization?
Voltage
Current
Frequency
Phase Sequence
Which of the following supply is given to the rotor winding of 3-Phase Induction Motor:
DC
No Supply but by induction
pulsating supply
AC
In Case of Synchronous Generator, when the load is thrown-off what happens to terminal voltage:
Decreases
Increases
Remains same
A Synchronous Machine having 4 poles and supplied with 60 Hz supply will rotate at ___:
1500
3000
3600
1800
