The following information is based information found in the Wildi Textbook, Chapter 16

An analysis was made that compared the relative efficiency of a generator to what physical characteristic of the machine?

The question is based on information obtained from the Wildi Textbook, Chapter 16

An A.C. alternator is unique as the rotor is comprised of two types of windings.

The rotor features a set of squirrel cage windings that are positioned in the laminated steel core, close to the outer surface of the rotor. Just below those rotor bars, there are traditional field coils.

In order to avoid confusion with other motor types, the squirrel cage winding has a proper name which is the                   winding. This is to help differentiate the alternator from the squirrel cage motor.

Note: Fill in the blank by typing a one word answer in the field provided below, do not use numbers or special characters.

The following question is based on information from the Delmar's textbook and Lab-Volt Lab manual.

Connecting an alternator to the electrical grid is complex as many conditions must be met in order to successfully "tie into the grid" with no harmful consequences.

Choose the three requirements from the list provided below.

Fill in the blanks with the most correct terms. The following is based on information found in the Wildi textbook, Chapter 16

Use letters only, no numbers or special characters. Watch your spelling.

Field excitation current for a large AC synchronous generator is important, this current is provided by means of a generator that is typically mounted on the end of the rotor shaft. The reason is to ensure a stable   terminal voltage.

Is it true that a synchronous generator, the amount of poles found in the rotor must equal the same amount of poles found in the stator?

Excitation current is used to control the output voltage of a three phase main alternator, how is the the excitation current converted into DC current to create the magnetic flux required inside the rotor? 

Fill in the blanks with the most correct terms. The following is based on information found in the Wildi textbook, Chapter 16

Use letters only, no numbers or special characters. Watch your spelling.

Most hydraulic turbines will turn at speeds in order to extract the maximum power from a body of water, in order to produce the desired terminal voltage at the proper 60 Hz frequency to tie into the electrical grid, a number of salient poles are required on the rotor. The coils are connected in series with adjacent poles having opposite polarities.

The following question is based on Lab # 35 of the Lab-Volt Manual

When using the lamp method to synchronize an alternator in preparation to tying into the electrical grid, it is observed that all three of the lamps are continuously blinking at the same steady rate.

Is the alternator in "sync" for connection?

Use the following information to calculate the speed of rotation in RPM (revolutions per minute) required to produce a frequency of 50 Hz for an Australian Mining company importing Canadian generators to a remote mine site.

The generator has 4 poles, the required frequency is 50 Hz.

Use the formula found on page 930 of the Delmar's textbook, Unit 32.

Note: Type in your numerical answer in the field below, do not use letters or special characters.

The following question is based on information obtained from the Wildi textbook, Chapter 16.

Large synchronous generators have to be responsive to changes in current demand from the infinite bus. In order to maintain a stable voltage and minimize fluctuations in the alternators terminal output, utilities will use what type of exciter that will monitor voltage conditions and send control signals to increase or lower the excitation current feeding the alternator and automatically adjust the output voltage due to changing conditions.

Please select the most correct answer from the selection provided below.