A three-phase motor can be regarded as a balanced Y load. Determine the phase current if it is connected to a 415 V, three phase, and 50 Hz supply. A delta connected load has (30 - j40) W impedance per phase. List the advantages of three-phase system over single-phase system. If the power dissipation in one coil is 200 W, determine the resistance of each coil. Two coils connected in parallel across a 50 V, DC supply, derive a current of 15 A from the supply. Calculate different powers, if a voltage of 5260° V is applied to the circuit. Calculate the total impedance of the circuit. A resistance of 20 W is connected in parallel with an impedance of (3 + j12) W.
PARALLELS TOOLBOX 4.5 SERIES
A series RLC circuit has R = 25 W, L = 0.221 H and C = 63 mF with frequency of 60 Hz. Calculate the value of R, if the total power dissipated in the circuit is 70 W when 50 V is applied to the circuit. A resistor R is connected in series with a parallel combination of two resistors having the values 20 W and 5 W individually. Explain the procedures to implement: (i) Current division rule and (ii) Voltage division rule. How are resistance, capacitive and inductive reactance affected by the change of frequency? Derive the equation for the current flowing through any resistance in a parallel circuit connected with 'n' number of different resistances.
Discuss the concepts of power factor for different load conditions such as R, L, C, R-L, and R-C.
Explain and compare the different types of powers with their corresponding equations and relationships. With the help of phasor diagrams and corresponding derivations, compare the voltage, current and impedance relationships for: (i) Resistor, (ii) Inductor, (iii) Capacitor, and (iv) RLC circuit. With suitable waveforms, explain the need for phasor representation. Explain the following AC circuit terminologies: (i) Peak value, (ii) Instantaneous value, (iii) Phase value, (iv) Average value, (v) RMS value, and (vi) Form factor. What is the value of additional resistor which can be connected in parallel to increase the current through the resistor to 15 A? The resistance of two wires is 25 W when connected in series and 6 W when they are joined in parallel. When the resistor is placed across a 230 V power supply, the current through the resistor is 1 A. If the internal resistance of the battery is 0.2 W and the potential difference across the 5 W resistor is 3 V, determine the voltage of the battery.
Questions A parallel combination of three resistors of 100 W, 10 W and 5 W is connected to a series resistor of 30 W and a battery.
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