Controlled Half-Wave Rectifiers Quiz

What happens during the negative half cycle of a controlled half-wave rectifier?

• SCR is always on

• SCR conducts

• SCR is forward-biased

• SCR is reverse-biased

What is the firing angle in a controlled half-wave rectifier?

• The angle of the output current

• The angle at which SCR starts conducting

• The angle of the input voltage

• The angle at which SCR stops conducting

What is the average output voltage formula for a resistive load?

• V_avg = V_m / π

• V_avg =( V_m / π) * (1 + cos(α))

• V_avg = V_m * (cos(α) - cos(β))

• V_avg = V_m / 2

What is the effect of an inductive load on a controlled half-wave rectifier?

• It decreases the input voltage

• It causes the SCR to turn off

• It increases the output voltage

• It stores energy in the inductor

What is the average output voltage for an inductive load?

• V_avg = V_m / 2

• V_avg = (V_m / π)* (cos(α) - cos(β))

• V_avg = (V_m / π) * (1 + cos(α))

• V_avg = V_m / π

What happens when the gate current is applied to the SCR?

• SCR turns off

• SCR starts conducting

• SCR remains off

• SCR stops conducting

What is the average output voltage of a single-phase half-wave controlled rectifier with a resistive load (R) and an input voltage of 120V (rms)?

• • A. 54V

• • B. 76V

• • C. 84.85V

• • D. 120V

How does the firing angle affect the output voltage in a controlled half-wave rectifier?

• Lower firing angle increases output voltage

• It only affects the frequency of the output

• It has no effect on the output voltage

• Higher firing angle increases output voltage

What is the peak output voltage of a single-phase half-wave controlled rectifier with an input voltage of 240V (rms)?

• • A. 169.7V

• B. 240V

• • C. 339.4V

• • D. 480V

In a single-phase half-wave controlled rectifier, what role does the freewheeling diode play when connected in parallel with the RL load?

• • A. It blocks the negative half-cycle of the input voltage

• • B. It conducts during the negative half-cycle to maintain load current continuity

• • C. It increases the output voltage

• • D. It decreases the output voltage