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 - 1 1. A step - down choppers can be used in : (a) Electric traction (b) Electric vehicles (c) Machine tools (d) All of these 2. Choppers is a : (a) AC - DC converters (b) AC - AC converters (c) DC - AC converters (d) DC - DC converters 3. 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) 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 5. In dc choppers, the waveforms for input and output voltages are respectively : (a) discontinuous, continuous (b) continuous, discontinuous (c) both continuous (d) bothdiscontinuous
555555555585. The reverse-bias current ________ with the increase of temperature. (a) decreases (b) increases (c) remains the same (d) None of the above
5555555555100. Typically, a unijunction transistor has a stand-off ratio from ________ to ________. (a) 0.0, 0.2 (b) 0.2, 0.4 (c) 0.4, 0.6 (d) 0.6, 0.8
Choppers » Exercise - 1 1. A step - down choppers can be used in : (a) Electric traction (b) Electric vehicles (c) Machine tools (d) All of these 2. Choppers is a : (a) AC - DC converters (b) AC - AC converters (c) DC - AC converters (d) DC - DC converters 3. 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) 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 5. In dc choppers, the waveforms for input and output voltages are respectively : (a) discontinuous, continuous (b) continuous, discontinuous (c) both continuous (d) bothdiscontinuous