V Fill in the gaps with correct prepositions.

 

1 Aircraft ac generators range __ size ___ thetachometer instrument generator __

to the 90,000volt-ampere generators.

2 Generators are categorized as either brush-type or brushless.

3 Regardless __weight, shape, or rating, practically all ___these generators have

the following common characteristics.

4 The ac generator field (rotor) is a rotating magnetic field ___ fixed polarity.

5 Regulating the rpm __the rotating magnetic field controls the voltage frequency.

6 Controlling the strength __ the magnetic field regulates the voltage.

7 A three-phase generator isactually three separate power sources enclosed __one

housing.

8 Each output winding produces 120 voltsas measured __ n to a, b, or c (phase

voltage).

9 The line voltage found __a three-phase,WYE-connected system is the vector sum

__ the voltagesgenerated __ two separate phase windings.

10 Because a 120-degree phase difference exists ___ thevoltages, they reach their

peak amplitudes __- differenttimes.

11 __ the four-wire, grounded-neutral, WYE-connectedsystem, the neutral wire

attaches __ the frame __theaircraft (ground).

12 The three-phase wires run __ buses,which supply power __ various loads.

13 A bus is a primarypower distribution point that is connected__ the mainpower

source.

14 The connections ___ loads requiring 120volts are between one __the buses and

the aircraft frame.

15 The load connections requiring 208 volts are___ two __the buses (phases).