4. A chopper operating at a fixed frequency is feeding an RL load. As the duty ratio of the chopper is increased from 25% to 75%, the ripple in the load current is :
(a) Remains constant (b) Decreases, reaches a minimum at 50% duty ratio and then increases (c) Increases, reaches a maximum at 50% duty ratio and then decreases (d) Keeps on increasing as the duty ratio is increased
Answer
Answer : (a)
Explanation
Explanation : No answer description available for this question. Let us discuss.
Choppers » Exercise - 14. A chopper operating at a fixed frequency is feeding an RL load. As the duty ratio of the chopper is increased from 25% to 75%, the ripple in the load current is : (a) Remains constant (b) Decreases, reaches a minimum at 50% duty ratio and then increases (c) Increases, reaches a maximum at 50% duty ratio and then decreases (d) Keeps on increasing as the duty ratio is increased
Choppers » Exercise - 15. In dc choppers, the waveforms for input and output voltages are respectively : (a) discontinuous, continuous (b) continuous, discontinuous (c) both continuous (d) both discontinuous
Choppers » Exercise - 13. The average value of the output voltage in a step - down dc chopper is given by : (a) V0 = Vs (b) V0 = DVs (c) V0 = Vs/D (d) V0 = Vs/(1-D)
5555555555 47. Voltage regulators keep a constant ________ output voltage when the input or load varies within limits. (a) dc (b) ac (c) ripple (d) none of these