EDI - Electric motors and Motor Control

What is the basic principle of a motor?

• Conversion of electrical energy to heat energy

• Conversion of mechanical energy to electrical energy

• Conversion of electrical energy to mechanical energy

• Conversion of heat energy to electrical energy

Which type of motor is driven by direct current?

• DC motor

• Synchronous motor

• Induction motor

• AC motor

What is the speed of the stator rotating field in an induction motor known as?

• Synchronous speed

• Constant speed

• Variable speed

• Asynchronous speed

Which type of motor is used in printers, copiers, and scanners?

• Linear motor

• Control motor

• Permanent magnet motor

• Stepper motor

What is a stepper motor also known as due to its characteristic of translating each pulse into a degree of rotation?

• Analog motor

• Variable motor

• Digital motor

• Continuous motor

Where can a linear motor be found?

• In a maglev train

• In a washing machine

• In a fan

• In a lift

What is the purpose of a servo motor?

• To operate valves in household water systems

• To produce a rotating magnetic field

• To provide better control of position

• To convert electrical energy to mechanical energy

Why is a starter needed for a three-phase induction motor during starting?

• To increase the starting current

• To reduce the high starting current

• To reduce the motor speed

• To provide better control of position

What is the purpose of the overload relay in a motor starter?

• To offer overload protection to the motor

• To provide better control of position

• To reduce the overload current

• To increase the overload current

Which type of starter is the simplest and cheapest method of starting squirrel-cage motors?

• Electronic soft starter

• Auto-transformer starter

• Direct-on-line starter

• Star-delta starter