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VSSC (ISRO) Technician B (Electronic Mechanic) 2012 Official Paper (Held on 22 Dec 2012)
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- Zero
- Lagging
- Leading
- Unity
Answer (Detailed Solution Below)
Option 4 : Unity
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Detailed Solution
Download Solution PDF- The overall power factor is defined as the cosine of the angle between thephase voltageandphase current.
- In AC circuits, the power factor is also defined as the ratio of the real power flowing to the load to the apparent power in the circuit.
- Hence power factor can be defined as watts to volt-amperes.
Power factor = cos ϕ
ϕ is the angle between the voltage and the current.
- For a purely resistive circuit, the angle between the voltage and current is 0°
So power factor for a purely resistive circuit is:
P.F. = cos 0°
P.F. = 1 (unity)
Important Points:
- In a purely inductive circuit, the current lags the voltage by 90° and the power factor is zero lagging
- In a purely capacitive circuit, the current leads the voltage by 90° and the power factor is zero leading
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Q1.Which of the following statements is INCORRECT for parallel resonance?
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Q10.Power factor of an AC circuit is:
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Q1.Which of the following statements is INCORRECT for parallel resonance?
Q2.An RLC series circuit has R =2 Ω, C = 20 μF and the inductance is adjusted such that the voltage across the resistance is maximum. If the applied voltage is 10 V at a frequency of 1000 rad/sec, then find the value of inductance L.
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Q4.For C = 101.5 nF, determine L for the series resonant circuit if the resonant frequency is 2800 Hz.
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Q7.The resonant frequency for a series R-L-C circuit is given by:
Q8.In a series RLC circuit, if the current at resonance is 10 A, then the current corresponding to half power delivered is:
Q9.\(\rm \frac{\sqrt{L/C}}{R}\)is:
Q10.A series RLC circuit will have unity power factor, when:
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