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14 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Which of the following best describes the split phase motor? |
The motor takes a single phase to run by separating the positive and negative Cycles |
The motor takes a single phase to run by separating the positive and negative Cycles. It uses the difference in Winding inductance to offset the faces. It uses a centrifical switch to add an additional winding for speed control after startup. Percentage of motor slip is usually less with three phase induction Motors |
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Which of the following is repairable on fractional horsepower motors? |
Brush replacement |
Rotor fan replacement. Motor bearing replacement. Armature winding replacement. Brush replacement |
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Which of the following is a motor that can be run on both AC and DC |
Universal motor |
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What device is used to prevent starting in wye and Delta concurrently |
Walking beam |
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Which of the following statements applies to Universal Motors |
In the Field and Armature current flows in the same direction |
In the Field and Armature current flows in the same direction. In the Field and Armature current flows in the opposite direction. They are usually used in applications requiring more than one horsepower. They do not use a commutator or brushes. |
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Which of the following statements is correct regarding AC induction Motors? |
Uses a stator to act as a rotating field |
Uses a commutator and brushes for the Armature. Uses a stator to act as a rotating field. Uses a rotor to act as a rotating field. Use a slip rings to apply AC to the rotor. |
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Which statement is correct |
Each phase follows the other by 120 degrees |
When phase a is at its positive phase b is at 0 in phase C is it 50% of peak in the negative Direction. When phase b is at negative Peak phase a is a positive Peak and phase c is at 0. Each phase follows the other by 60 degrees. Each phase follows the other by 120 degrees |
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What is the rotating speed of a 3 phase 60 hertz 4 pole motor |
1800 RPM |
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What is the rotating speed of a 3 phase 30 Hertz 6 pole motor |
900 RPM |
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Which statement describes synchronous speed |
Rotational speed of the state of magnetic field on an induction motor |
The rotational speed of the stators magnetic field on an induction motor. The rotational speed of the field windings magnetic field on a conduction motor. The rotational speed of the Armature on a conduction motor. The rotational speed of the rotor on an induction motor. |
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If a squirrel cage motor rotation is clockwise with ACB phase sequence, and the phase sequence is ABC is applied what happens to the motor |
Rotates counterclockwise |
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Which of the following statements best describes the rotor on a squirrel cage induction motor |
The rotor consists of heavy bars or rods connected together at the end |
The rotor consists of heavy bars or rods connected together at the ends. The rotor consists of a wire wound Armature that is electrically connected to slip rings. The rotor consists of heavy bars or rods that are perfectly parallel with the axis of rotation. The rotor consists of a wire round Armature that acts as a rotating magnetic field |
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What will be the correct stator field alignment based upon this sine wave position indicated by the vertical shaded bar |
AB |
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What is the purpose of the blocked rotor test |
Determines the normal initial starting current |
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