Induction Motor Quiz

What is the most common cause of an induction motor failing to start?

• Overvoltage

• Stator winding fault

• Worn-out bearings

• Low ambient temperature

If an induction motor hums but does not rotate, the likely problem is:

• Bearing failure

• Rotor bar damage

• Low voltage supply

• Capacitor failure (in single-phase motors)

Excessive vibration in an induction motor may be caused by:

• Perfect alignment

• Loose or misaligned mounting

• Balanced rotor

• Adequate lubrication

What should be checked if an induction motor trips frequently?

• Overload relay setting

• Shaft alignment

• Motor insulation color

• Stator design

Which test is commonly used to check the insulation resistance of a motor?

• Megger test

• Continuity test

• Temperature test

• Load test

A motor overheating issue is usually caused by:

• Low ambient temperature

• Excessive load

• Proper ventilation

• Sufficient voltage

If the rotor bars of an induction motor are damaged, it may result in:

• High torque

• Uneven speed or stalling

• Reduced temperature

• Constant vibration

A buzzing sound in an induction motor is often due to:

• Overheating

• Loose laminations

• High voltage

• Short circuit in rotor

What problem is indicated if a motor is running at lower speed than normal?

• Excessive load

• High power factor

• High voltage

• Loose shaft coupling

Which instrument is used to check the continuity of motor windings?

• Megger

• Multimeter

• Oscilloscope

• Tachometer