1. When you\'re taking a PM motor apart you should exercise special care not to
ID: 2249908 • Letter: 1
Question
1. When you're taking a PM motor apart you should exercise special care not to damage the
D. brush holders.
2. When field voltage is controlled to provide a method of variable speed control, the system is using a concept known as field
D. weakening.
3. Which one of the following types of motors can be powered with either AC or DC electricity?
D. Universal motor
4. A PM field servo motor may be equipped with a resolver that is used to
D. excite the armature windings.
5. The stray currents that are created as a magnetic material is magnetized and then demagnetized are called
D. pole currents.
6. The opposition to the flow of magnetic flux is called
D. friction.
7. The magnets that are used in the field of a quality DC PM motor are made from
D. natural magnets.
8. If an electronic control system is starting a motor, it will keep start-up current within limits by using
D. a pulsed diode control.
9. Which one of the following types of motors is not normally reversible?
D. Brushless DC motor
10. If the field windings of a 50/100 VDC motor are connected to a 100 VDC source of power, the field windings should be connected in
D. parallel with the armature.
11. The magnetic material that's placed inside a coil of wire in a motor is called a
D. concentrator
12. One common type of electronic circuit component that is used to control the voltage and current to a DC motor is the
D. diode.
13. Which one of the following motor types uses permanent magnets in the armature or rotor?
D. PM servo motor
14. A normal commutator will have which one of the following colors where the brushes contact the commutator?
D. Auburn-brown
15. A type of resistance device that can be placed in a DC motor circuit and varied to limit the speed of a motor is called a
D. potentiometer.
16. The energy that's lost in a DC motor is rather small. Most of the energy is lost as
D. windage losses inside the motor.
17. What type of motor has the same wire diameter in both the field and the armature coils?
18. There are two wires labeled P1 and P2 at a DC motor's junction box. These wires will attach to what internal component of the motor?
D. A speed potentiometer
19. The letters CEMF are used to describe
D. critical winding currents that should not be exceeded
20. A DC motor that has interpoles will have the interpole windings in
21. As you walk up to a machine, you see a technician tapping on the back section of a DC motor with a lead mallet. This technician is
D. reseating the rear end bell on the case.
22. The large current that a DC motor will draw on start-up is called
D. acting current.
23. An encoder is a device that is used to
D. excite the motor's interpoles.
24. The major failure area of a typical wound-field and wound-armature DC motor is
D. open field windings.
25. The metal plates that are riveted or bolted together inside a motor are called
1. When you're taking a PM motor apart you should exercise special care not to damage the
A. permanent magnets. B. commutator. C. end bells.D. brush holders.
2. When field voltage is controlled to provide a method of variable speed control, the system is using a concept known as field
A. stability. B. drive. C. bias.D. weakening.
3. Which one of the following types of motors can be powered with either AC or DC electricity?
A. Servo motor B. Pancake motor C. Shunt-wound motorD. Universal motor
4. A PM field servo motor may be equipped with a resolver that is used to
A. create a voltage that increases with velocity. B. feed back position information. C. prevent the brushes from sparking.D. excite the armature windings.
5. The stray currents that are created as a magnetic material is magnetized and then demagnetized are called
A. hysterysis currents. B. eddy currents. C. lag currents.D. pole currents.
6. The opposition to the flow of magnetic flux is called
A. resistance. B. magnomotive force. C. reluctance.D. friction.
7. The magnets that are used in the field of a quality DC PM motor are made from
A. magnetized steel. B. rare-earth material. C. special aluminum-nickel compounds.D. natural magnets.
8. If an electronic control system is starting a motor, it will keep start-up current within limits by using
A. an acceleration ramp. B. a rheostat and a relay. C. coast-up system.D. a pulsed diode control.
9. Which one of the following types of motors is not normally reversible?
A. PM motor B. Servo motor C. Universal motorD. Brushless DC motor
10. If the field windings of a 50/100 VDC motor are connected to a 100 VDC source of power, the field windings should be connected in
A. series with the armature. B. series with each other. C. parallel with each other.D. parallel with the armature.
11. The magnetic material that's placed inside a coil of wire in a motor is called a
A. form. B. rod. C. pole.D. concentrator
12. One common type of electronic circuit component that is used to control the voltage and current to a DC motor is the
A. resistor. B. capacitor. C. silicon-controlled rectifier.D. diode.
13. Which one of the following motor types uses permanent magnets in the armature or rotor?
A. Stepper motor B. Pancake motor C. PM motorD. PM servo motor
14. A normal commutator will have which one of the following colors where the brushes contact the commutator?
A. Slate-gray B. Chocolate-brown C. BlackD. Auburn-brown
15. A type of resistance device that can be placed in a DC motor circuit and varied to limit the speed of a motor is called a
A. power resistor. B. variable reluctor. C. rheostat.D. potentiometer.
16. The energy that's lost in a DC motor is rather small. Most of the energy is lost as
A. stray magnetic fields. B. heat losses to the case. C. friction in the bearings.D. windage losses inside the motor.
17. What type of motor has the same wire diameter in both the field and the armature coils?
A. Series-wound B. Shunt-wound C. Compound-wound D. Interpole-wound18. There are two wires labeled P1 and P2 at a DC motor's junction box. These wires will attach to what internal component of the motor?
A. A thermostat B. The parallel winding C. GroundD. A speed potentiometer
19. The letters CEMF are used to describe
A. centrifugal forces within a motor. B. the portion of the supplied current that is converted to heat. C. countervoltages and currents created within a motor.D. critical winding currents that should not be exceeded
20. A DC motor that has interpoles will have the interpole windings in
A. parallel with the armature. B. parallel with the field windings. C. series with the field windings. D. series with the armature.21. As you walk up to a machine, you see a technician tapping on the back section of a DC motor with a lead mallet. This technician is
A. looking for weak or worn brushes. B. cleaning the commutator. C. checking for end bell cracks.D. reseating the rear end bell on the case.
22. The large current that a DC motor will draw on start-up is called
A. inrush current. B. velocity current. C. dynamic current.D. acting current.
23. An encoder is a device that is used to
A. reduce brush sparking. B. commutate the field windings. C. feed pack position information.D. excite the motor's interpoles.
24. The major failure area of a typical wound-field and wound-armature DC motor is
A. a faulty commutator segment. B. brush wear and failure. C. bearing failure.D. open field windings.
25. The metal plates that are riveted or bolted together inside a motor are called
A. laminations. B. discs. C. sheaves. D. cores.Explanation / Answer
1- D is correct
As the brush holders are the most sensitive and outer parts but others are fixed pretty well.
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Extra -
2- Bias
3-Universal motors.
4-Feedback position information.
5-Hysteresis currents.
6-Reluctance
7-Rare earth material
8-An acceleration ramp.
9-Servo motor
10-Series with each other
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