Superposition Theorem Thevenin’s Theorem VTH = Open circuit voltage across ab (After removing load)
RTH = Equivalent resistance across ab (After removing load. Kill the source also)
Find the current flowing through 20 Ω resistor using Thevenin’s Theorem
Maximum Power Transfer Theorem Nodal Analysis or Node Voltage method or KCL Method Find the current flowing through all resistors using Nodal Analysis Nodal Analysis or Node Voltage method or KCL Method Nodal Analysis or Node Voltage method or KCL Method RMS and average value of half wave rectified sine wave RMS value RMS and average value of half wave rectified sine wave Average value RMS and average value of full wave rectified sine wave ANOTHER METHOD IN NEXT PAGE 1. For a three phase star connected system with a line voltage of 400 V, calculate the value of phase voltage.
A. 400 V
B. 692.8 V
C. 331.33 V
D. 230.94 V
ANSWER: D 2. Phase voltages of the windings of a 3-wire star-connected machine are 2 kV. Line voltages of the machine is
a.1732.05 V
b.1154.70 V
c.2309.4 V
d.3464.10 V
ANSWER: (d) 3. For a three phase delta connected system with a line voltage of 400 V and line current is 100 A, calculate the value of phase voltage and phase current.
A. 400 V, 173.2 A
B. 400 V, 57.7 A
C. 230.9 V, 100 A
D. 230.9 V, 57.7 A
ANSWER:B
