AC Machines

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