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WorksheetsModule 7745 Chapter F
Total questions: 6
Worksheet time: 3mins
Which of these statements is incorrect with respect to AC generators and DC generators?
An AC generator is simpler in construction
A DC Generator is not as efficient
A DC Generator has a better power to weight ratio
The transmission of AC power is more efficient
Which of these statements is not an advantage of a Stationary Armature over a Rotating Field System.
The stator provides a greater space for more armature windings, therefore more output power can be generated
The output windings can be distributed around the stator making them easier to keep cool
The output windings are easier to insulate for higher induced voltages
The rotating field requires minimal current to energise the field; so only a small commutator and brushes are necessary
Construction is simpler
Which of these statements is incorrect with regard to a Cylindrical Pole Rotor
It is used for high Speed applications
It has a large diameter in comparison to its length
The rotor has two poles
It has a steel rotor
Which of these statements is incorrect with regard to a Salient Pole Rotor
It is used for High Speed applications
It has a large diameter in comparison to its length
The rotor has any even number of poles
The poles are laminated and hold the field windings
What two properties below are essential for effective slip rings.
Select 2 answers
High electrical resistance
Low electrical resistance
High coefficient of friction
Low coefficient of friction
Which of these statements is not an advantage of a three phase AC generator?
The stator space is better occupied by three phases, producing a greater output.
The mechanical input power to the generator is better balanced and not pulsing.
The three phase output produces a rotating magnetic field, which can be utilised by three phase induction motors.
The 3 phase output is a balanced system ideal for efficient load sharing over an AC power distribution system.
