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Self-Test 1 Q&A 3-6
Self-Test Questions Volume 1
| Question | Answer |
|---|---|
| What is the function of a generator? | To convert mechanical energy into electrical energy |
| Any DC generator must have a commutator. (T/F) | True |
| There is a difference between the rotating coils and the magnetic field of an AC and a DC generator. (T/F) | False |
| The current from a rotating loop with slip rings is alternating current. (T/F) | True |
| The difference between AC and DC generators is the method of collecting the current. (T/F) | True |
| When the generator rotating loop is parallel with the field, the generator produces maximum voltage. (T/F) | False |
| A generator takes the energy of the prime mover and changes the energy to electrical power. (T/F) | True |
| What are the types of alternators? | Single-phase and three-phase |
| In what two ways does an alternator operate? | By the principle of either moving conductors across a magnetic field or moving a magnetic field across the conductors. |
| How does a single-phase alternator produce one cycle of alternating current? | The first half revolution of the rotor produces a voltage in one direction and completes the first half of the cycle; the second half revolution produces a voltage in the opposite direction and completes the last half of the cycle. |
| What is used to supply the DC voltage in a three-phase alternator? | An exciter |
| How many degrees are the poles set apart for three-phase operation of an alternator? | 120° |
| What is the difference between a primary and a secondary cell? | The primary cell can’t be recharged; the secondary cell can |
| What solution is used for the electrolyte in a lead-acid battery? | Sulfuric acid and water solution |
| What active materials make up the negative and positive plates of a lead-acid battery? | The negative plate is spongy lead and the positive plate is lead peroxide |
| What solution is used for the electrolyte in a nickel-cadmium battery? | Potassium hydroxide and distilled water |
| What is commonly used with AC instruments to measure high voltages or large currents and to isolate the high-power circuits? | Instrument transformers |
| What causes voltage to be induced in a transformer? | Buildup and collapse of the magnetic field |
| What type of transformer produces a secondary voltage that is higher than the primary voltage? | Step it up |
| Name the main parts of a transformer. | Primary winding, secondary winding and iron core |
Created by:
RenegadeWolf
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