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MECH1320ACmotorsHomework

True/False
Indicate whether the statement is true or false.
 

 1. 
Another name for an Induction motor is an Asychronous motor.
 

 2. 
Permanent magnet motors are the most common motor in industry.
 

 3. 
Synchronous motors use induction to rotate the shaft.
 

 4. 
The number of poles can effect the speed of a Synchronous motor.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 5. 
A motor that has a rotating magnetic field in the stator and a fixed magnetic field in the rotor.
a.
Induction Motors
c.
DC Motors
b.
Synchronous Motors
d.
None of the above
 

 6. 
A motor that has a rotating magnetic field in the stator and an induced magnetic field in the rotor.
a.
Induction Motors
c.
DC Motors
b.
Synchronous Motors
d.
None of the above
 

 7. 
This is a ____________.

mc007-1.jpg
a.
Stator
c.
Squirral Induction Rotor
b.
Wound Rotor
d.
Permenant Magnet Rotor
 

 8. 
This is a ____________.

mc008-1.jpg
a.
Stator
c.
Squirral Induction Rotor
b.
Wound Rotor
d.
Permenant Magnet Rotor
 

 9. 
This is a ____________.

mc009-1.jpg
a.
Stator
c.
Squirral Induction Rotor
b.
Wound Rotor
d.
Permenant Magnet Rotor
 

 10. 
Which is the proper way to reverse a 3 phase motor?

mc010-1.jpg

mc010-2.jpg

mc010-3.jpg
a.
Example 1
c.
Example 3
b.
Example 2
d.
All three examples
 

 11. 
If one Sychronous motor has 2 poles and another Sychronous motor has 4 poles.
a.
The 2 pole motor operates at a slower speed than the 4 pole motor.
d.
The 4 pole motor operates at a slower speed than the 2 pole motor.
b.
The 2 pole motor operates at the same speed as the 4 pole motor.
e.
The only pole that I know about is the North Pole.
c.
The 4 pole motor operates at a faster speed than the 2 pole motor.
 

Matching
 
 
a.
Mechanical Speed
c.
Slip
b.
Sychronous Speed
 

 12. 

 The ratio of the difference between synchronous and mechanical speeds to the synchronous speed.
 

 13. 

 The actual speed of the rotor.
 

 14. 

 The speed of rotation of the magnetic field in the stator.
 
 
a.
Shaded Pole
c.
Split-Phase
b.
Capacitor Start
d.
Capacitor Start-Capacitor Run
 

 15. 

 The auxiliary winding is connected in parallel to the stator winding, then a centrifugal switch disconnects it when motor aquires speed.
 

 16. 

 A capacitor is connected in series with the auxiliary winding to make a rotating magnetic field in the stator.  This motor is used in compressors, pumps, and air conditioners.
 

 17. 

 A permanent capacitor is used in this type.  It is the most expensive and gives the highest starting torque.
 

 18. 

 The cheapest motors and they produce the smallest amount of starting torque.  They are the least efficient.
 



 
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