CIE iGCSE Co-Ordinated Science P4.5.2 The a.c. generator Exam Style Questions Paper 2
Question
What is the purpose of the slip rings in an alternating current (a.c.) generator?
(A) to allow each end of the coil to contact each carbon brush alternately
(B) to allow each end of the coil to remain in contact with the same carbon brush at all times
(C) to maintain a constant voltage in the output circuit while the coil is rotating
(D) to remain stationary while the coil rotates between them
▶️Answer/Explanation
Ans : B
Question
Which voltage–time graph shows the output voltage of a simple a.c. generator?
▶️Answer/Explanation
Ans: B
Question
Which graph shows the voltage output of an alternating current (a.c.) generator?
▶️Answer/Explanation
Answer: D
Explanation: An AC generator produces a sinusoidal (sine wave) output voltage that alternates smoothly between positive and negative values. This represents the continuous rotation of the coil in a magnetic field, with the voltage varying as the sine of the angle between the coil and field.
Question
What is the purpose of the slip rings in an alternating current (a.c.) generator?
A. to allow each end of the coil to contact each carbon brush alternately
B. to allow each end of the coil to remain in contact with the same carbon brush at all times
C. to maintain a constant voltage in the output circuit while the coil is rotating
D. to remain stationary while the coil rotates between them
▶️Answer/Explanation
Answer: B
Explanation: Slip rings are continuous conducting rings that rotate with the coil, maintaining constant contact with stationary brushes. This allows the coil to rotate continuously while keeping electrical contact, enabling the alternating current to be conducted to the external circuit without twisting wires. They don’t alternate contact or maintain constant voltage directly.