Synchronous Motor and MG Set

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Q1: What is the name of the converter?

• Metal rectifier
• Rotary converter
• Mercury arc rectifier
• Silicon controlled rectifier

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Q2: What is the name of the converter?

• Metal rectifier
• Rotary converter
• Mercury arc rectifier
• Motor-Generator set

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Q3: 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

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Q4: Which acts as both inverter and converter?

• Metal rectifier
• Mercury arc rectifier
• Semi conductor diode
• Synchronous converter

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Q5: What is the function of inverter?

• Convert A.C to D.C
• Convert D.C to A.C
• Smoothening AC sine wave
• Convert pulsating DC into pure D.C

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Q6: Which converting device can be over loaded?

• Rectifier unit
• Rotary converter
• Motor generator set
• Mercury arc rectifier

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Q7: 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

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Q8: Which application requires only DC?

• Electroplating
• Stepping up of voltage
• Operating induction motor
• Operating repulsion motor

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Q9: 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

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Q10: Which is the main application of synchronous motor?

• Elevators
• Paper rolling mills
• AC to DC converter
• Power factor correction device

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Q11: What is the advantage of motor generator set?

• Noiseless
• High efficiency
• Low maintenance required
• DC output voltage can be easily controlled

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Q12: What is the function of the part marked as 'X' of the rotary converter?

• Converts AC to DC
• Reduces voltage drop
• Helps to deliver without noise
• Collects the delivered direct current

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Q13: What is the purpose of damper winding in a synchronous motor at starting?

• Produce high voltage to initiate the rotation
• Produce high current to start rotate the motor
• Produces torque and runs near in synchronous speed
• Produce a high magnetic-field to maintain a constant speed

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Q14: Why the synchronous motor fails to run at synchronous speed?

• Insufficient excitation
• Defective pony motor
• Open in damper winding
• Short in damper winding

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Q15: How the synchronous motor is used as a synchronous condenser?

• Varying the motor load
• Varying the rotor excitation
• Varying stator voltage in motor
• Varying stator current in motor

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Q16: What is the function of damper windings in synchronous motor?

• Maintain power factor
• Excite the field winding
• Maintain constant speed
• Start the synchronous motor

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Q17: Which converter is having high efficiency?

• SCR converter
• Rotary converter
• Motor generator set
• Mercury arc rectifier

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Q18: How synchronous motor works as a power factor corrector?

• Varying the line voltage
• Varying the field excitation
• Increasing the speed of motor
• Decreasing the speed of motor

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