A single phase half wave rectifier is feeding a resistive load. When a = 0, dc o

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Question
A single phase half wave rectifier is feeding a resistive load. When a = 0, dc output voltage is 127 V. When a = 30�, the dc output voltage will be about
Options
A. 127 V
B. 120 V
C. 110 V
D. 100 V

Correct Answer

120 V

Explanation

Using Eq

A single phase half wave rectifier is feeding a resistive load. When a = 0, dc output voltage is 127 = 0.933.

Hence V_dc for 30� firing angle = 0.933 x 127 = ? 120 V.

9. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally
Options
A. equal
B. different
C. equal or different
D. different but sometimes equal

10. The real part of complex dielectric constant and tan? for a dielectric are 2.1 and 5 x 10^-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is
Options
A. 1.05 x 10^-3
B. 2.1 x 10^-3
C. 5 x 10^-3
D. 1.05 x 10^-2

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