Solve and Find:a) The complex power absorbed in the voltage source.b) The real power absorbed in the capacitor.c) The reactive power absorbed in the resistor in series with the -j800 capacitor.
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Kindly solve the below questions:
1. Assume the AC frequency is 50 Hz. Convert these phasors to signals (remember that phasor magnitudes are RMS values of the signals)
(a) V = 115∠90V
(b) I = 10 + 10j A
2. Convert these signals to phasors (remember to us RMS values for the phasor magnitude)
3. Suppose the voltage across a load is v(t) and the current drawn is i(t) where
v(t) = 230cos (314t + 20) V
(a) calculate the complex power, real power, reactive power and apparent power.
(b) calculate the power factor and indicate if it is leading or bagging
Question 3 (IEIIQ16)
A 3 W rated Zener diode is used in a shunt voltage regulator circuit to supply a dc output of 12 V to a variable load with a minimum resistance of 240 Ω. The supply voltage varies between 20 V and 24 V.
3.1 Draw the circuit diagram.
3.2 Calculate the range of series resistance that may safely be used in this circuit. Select a single suitable standard value.
3.3 Calculate the maximum power rating required for the series resistor.
Question 4 (IEIIQ17)
A simple Zener voltage regulator is required to provide a steady regulated output voltage of 10 V under a maximum load of 80 mA, while the input voltage to the regulator varies between 12 V and 14 V.
17.1 Calculate the maximum rated current value of a Zener diode to be used
17.2 Calculate the minimum power for the Zener that could be used safely.
17.3 If a 5 W rated Zener were to be used in this circuit:
(i) Calculate the maximum rated current value of a Zener device to be used
(ii) Calculate the range of possible RS. limiting resistor values.
(iii) Suggest a suitable standard E12 resistor value
Question 5 (IEIIQ18)
A simple Zener shunt voltage regulator is to supply a 10 V to load of 100 mA, the input supply voltage varies between 15 V and 20 V.
5.1 Draw the circuit diagram.
5.2 Calculate the minimum power for the Zener that could be used safely in this circuit.
5.3 Using a Zener diode with a power rating of twice this minimum value.
5.4 Calculate the range of series resistance that may safely be used in this circuit and suggested a suitable standard resistance value.
Question 6 (IEIIQ19)
A voltage regulator is required to provide a regulated terminal voltage of 25 V at a maximum load of 150 mA. The input volage varies between 50 V and 75 V dc.
6.1 Calculate the minimum power for the Zener that could be used safely in this circuit.
6.2 If a 30 W rated Zener is used, calculate the range of possible series resistance, RS. values and suggest a suitable standard E12 resistor value.
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