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A generator is a device that converts ? energy into ? energy.
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When a conductor cuts magnetic flux lines, a voltage is induced into the conductor T/F
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Lesson 6
| Question | Answer |
|---|---|
| A generator is a device that converts ? energy into ? energy. | c. mechanical / electrical |
| When a conductor cuts magnetic flux lines, a voltage is induced into the conductor T/F | True |
| DC generators operate on the principle of electromagnetic induction T/F | True |
| According to Fleming’s generator rule, match the correct meaning of the extended digits in the figure. | Center finger: Direction of current Fore finger: direction of flux field Thumb: Direction of thrust |
| ? voltage is being produced when the rotating conductor is parallel to the magnetic flux lines. | Zero |
| Maximum voltage is induced into a conductor when it cuts the magnetic field at ? | 90 degrees |
| ? voltage is induced into the conductor when the loop is at 0°, 180°, and 360° in relation to the field. | Zero voltage |
| When a conductor loop is continuously rotated in a magnetic field, the AC output voltage follows the ? function | Sine |
| To convert the AC voltage from the armature to DC voltage, DC generators make use of a(n) ? . | commutator |
| A ? causes the AC voltage that is generated to appear as a DC voltage output, because it is a ring constructed of segments separated by insulating material The connection of the generator loop to these segments is such that the output is always of the | Commutator |
| When AC voltage is generated and then converted to DC voltage by use of a commutator, the voltage output is constant. Select | Note: The voltage is a pulsating DC voltage and is more commonly referred to as ripple voltage. The correct answer is 'False'. |
| The frequency of the pulsating DC output voltage of a generator is ? that of an AC generator. | Twice |
| What is the name of the rotating member of the DC generator? | Armature |
| The ? are components that make up the armature | 1.commutator Incorrect 2.iron core Incorrect 3 windings Incorrect |
| ? is/are a type of armature windings found in generators | Frogleg Lap wound Wave wound |
| The wires connected to the brushes of a generator are designated ? and ? | A1 and A2 |
| ? wound armatures are probably the most commonly used because they are designed for moderate voltages and moderate currents. | Frogleg |
| ? wound armatures are used in machines designed for high voltage and low current. Answer 2 | Wave |
| ? wound armatures are used in machines designed for low voltage and high current. | Lap |
| What is the function of pole pieces installed in the generator housing? | To help concentrate the magnetic field |
| Once the pole pieces are mounted in the generator, the field windings are ? the pole pieces to form an electromagnet. | Wound around |
| Permanent magnets are used sometimes as the field poles in small generators | True |
| What are the two types of connections for generator field windings? | Series and shunt |
| The series field windings are made up of ? turns with large wire, and the leads are labeled ? and ? . | few / S1 / S2 |
| Shunt field windings are connected in ? with the armature in a generator, and the leads are tagged ? and ? | parallel / F1 / F2 |
| The shunt field has a ? resistance because it is made of ? wire | High\small |
| When a load is connected to a series generator, the output voltage ? . | Increases |
| A series generator is self-excited with residual ? | Magnetism |
| As additional loads are connected to a series generator, the output voltage will continue to ? until the iron in the pole pieces and armature becomes ? | increase / saturated |
| Which of the factors listed determine the level of the output voltage of a series generator? I. Number of turns in the armature II. The strength of the magnetic field at the pole pieces III. The speed of the cutting action IV. The direction of rotation | 1...2....and 3 |
| Series generators would be best used with a ? | Constant |
| Self-excited shunt generators make use of ? to start the generation process. | residual magnetism |
| The shunt type of generator provides ? output voltage before the load is applied | maximum |
| As the load is increased on a shunt type generator, the output voltage will ? | decrease |
| To control the output voltage of a shunt generator, an electronic voltage regulator is installed to sense changes in the output voltage and makes adjustments to the shunt field current. | True |
| Compound generators make use of a ? field winding and a ? field winding | Series/ shunt |
| Compound generators overcome the voltage regulation problems of a series generator, providing good flexibility, voltage regulation, and load control | True |
| The greatest generator loss is due to the ? of the windings | Resistance |
| Power loss due to induced currents in the core material of a generator is called ? loss. Select one | Eddie current |
| Almost all power losses in a generator, with the exception of flux linkage, are manifested in the form of ? | Heat |
| ? loss is due to molecular friction | Hysterisis |
| The two primary magnetic flux fields in a generator are field flux and armature flux. | True |
| The magnetic neutral plane will shift in the direction of the field rotation. | false |
| To prevent a shift in the neutral plane, ? windings are installed in the generator to cancel the effects of self-induction in the armature | a. compensating b. interpole c. Thomson-Ryan |
| When DC generators are connected in parallel, an equalizing connection is used to connect the ? fields of the two machines in ? with each other. | series / parallel Correct |
| If two DC generators are simply connected in parallel without an equalizer connection, one generator will take the load and the second generator will act as a DC motor, drawing current from the first generator. | True |
Created by:
Shawnt321