Electrician 3rd sem Synchronous Motor and MG set

What is the name of the converter?

• Metal rectifier

• Rotary converter

• Mercury arc rectifier

• Silicon controlled rectifier

What is the name of the converter?

• Metal rectifier

• Rotary converter

• Mercury arc rectifier

• Motor-Generator set

Why D.C supply is necessary for synchronous motor operation?

• Reduce the losses

• Start the motor initially

• Run the motor with over load

• Run the motor at synchronous speed

Which acts as both inverter and converter?

• Metal rectifier

• Mercury arc rectifier

• Semi conductor diode

• Synchronous converter

What is the function of inverter?

• Convert A.C to D.C

• Convert D.C to A.C

• Smoothening A.C sine wave

• Convert pulsating DC into pure D.C

Which converting device can be over loaded?

• Rectifier unit

• Rotary converter

• Motor generator set

• Mercury arc rectifier

Why exciter is essential to run a synchronous motor?

• Carry more load in motor

• Improve the power factor

• Reduce the losses in motor

• Run the motor at synchronous speed

Which application requires only DC?

• Electroplating

• Stepping up of voltage

• Operating induction motor

• Operating repulsion motor

Why the LED’s are avoided as converters in rectifier diodes?

• Heavily doped device

• Very low power device

• Designed for light emitting

• Very sensitive to temperature

Which is the main application of synchronous motor?

• Elevators

• Paper rolling mills

• AC to DC converter

• Power factor correction device