Question

QUESTION 1: COMPULSORY For a three-phase half-wave rectifier supplying a purely resistive load, a) Draw a circuit diagram. [4 marks] b) Compute, i) The average output voltage [2 marks] ii) The rms value of the output voltage [2 marks] iii) The form factor [2 marks] iv) The ripple factor [2 marks] c) A thyristor half-wave-controlled converter has a supply voltage of 240 V at 50 Hz and a load resistance of \( 100 \Omega \). What are the average values of load voltage and current when firing delay angle is: i) \( 70^{\circ} \) [1 mark] ii) \( 85^{\circ} \) [1 mark] a) A \( 240 \mathrm{~V}, 50 \mathrm{~Hz} \) supply feeds a highly inductive load resistance through a thyristor bridge that is: r Half-controlled > Fully-controlled For each case when the firing angle delay \( \alpha=25^{\circ} \), calculate; i) Load current [2 marks] ii) Power [2 marks] iii) Power factor [2 marks] Total:20 marks

          QUESTION 1: COMPULSORY
For a three-phase half-wave rectifier supplying a purely resistive load,
a) Draw a circuit diagram.
[4 marks]
b) Compute,
i) The average output voltage
[2 marks]
ii) The rms value of the output voltage
[2 marks]
iii) The form factor
[2 marks]
iv) The ripple factor
[2 marks]
c) A thyristor half-wave-controlled converter has a supply voltage of 240 V at 50 Hz and a load resistance of \( 100 \Omega \). What are the average values of load voltage and current when firing delay angle is:
i) \( 70^{\circ} \)
[1 mark]
ii) \( 85^{\circ} \)
[1 mark]
a) A \( 240 \mathrm{~V}, 50 \mathrm{~Hz} \) supply feeds a highly inductive load resistance through a thyristor bridge that is:
r Half-controlled
> Fully-controlled
For each case when the firing angle delay \( \alpha=25^{\circ} \), calculate;
i) Load current
[2 marks]
ii) Power
[2 marks]
iii) Power factor
[2 marks]
Total:20 marks

QUESTION 1: COMPULSORY
For a three-phase half-wave rectifier supplying a purely resistive load,
a) Draw a circuit diagram.
[4 marks]
b) Compute,
i) The average output voltage
[2 marks]
ii) The rms value of the output voltage
[2 marks]
iii) The form factor
[2 marks]
iv) The ripple factor
[2 marks]
c) A thyristor half-wave-controlled converter has a supply voltage of 240 V at 50 Hz and a load resistance of 100 Ω. What are the average values of load voltage and current when firing delay angle is:
i) 70^∘
[1 mark]
ii) 85^∘
[1 mark]
a) A 240 V, 50 Hz supply feeds a highly inductive load resistance through a thyristor bridge that is:
r Half-controlled
> Fully-controlled
For each case when the firing angle delay α=25^∘, calculate;
i) Load current
[2 marks]
ii) Power
[2 marks]
iii) Power factor
[2 marks]
Total:20 marks

Added by Juan Francisco Z.

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