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Self-Test 1 Q&A 3-6

Self-Test Questions Volume 1

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