Recent questions tagged impedance

Description : Define impedance diagram and reactance diagram.

Last Answer : Impedance diagram: Impedance diagram is the simplified equivalent circuits of single line or one line diagrams of power system in which all components are represented by their equivalent circuit.  ... machines are neglected and is used only for fault current calculation is called reactance diagram.

Description : A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.

Last Answer : Solution

Description : Give the effect of source impedance on converter operation.

Last Answer : Effect of source impedance on converter operation: For single-phase fully controlled bridge converter, the SCRs are triggered in pairs alternately. During positive half-cycle of input, SCRs T1 and T2 are triggered ... increases and as a consequence, the output dc voltage decreases. 

Description : Impedance ratio

Last Answer : Impedance ratio

Description : How to find total impedance Z, current I and Impedance angle ?

Last Answer : How to find total impedance Z, current I and Impedance angle ?

Description : A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9 

Last Answer : A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9 

Description :  An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS 

Last Answer :  An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when ZL = R-jXS

Description : The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be

Last Answer : The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be 0.5 Ohm

Description : A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of

Last Answer : A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of 0.02 P.U

Description : The surge impedance for over head line is taken as  (1) 10-20 ohms (2) 50-60 ohms (3) 100-200 ohms (4) 1000-2000 ohms

Last Answer : The surge impedance for over head line is taken as 100-200 ohms

Description : Which of the following is true for a bus impedance matrix ?  (A) It is sparse  (B) It has diagonally dominant elements  (C) It is the inverse of the bus admittance matrix  (D) Each element of it is the reciprocal of the corresponding element in admittance matrix

Last Answer : Which of the following is true for a bus impedance matrix ?  (A) It is sparse  (B) It has diagonally dominant elements  (C) It is the inverse of the bus admittance matrix  (D) Each element of it is the reciprocal of the corresponding element in admittance matrix

Description : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

Last Answer : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.

Description : In a series resonant circuit, the impedance of the circuit is?

Last Answer : In a series resonant circuit, the impedance of the circuit is minimum.

Description : Is the input impedance of MOSFET more than BJT and FET?

Last Answer : Yes, the input impedance of MOSFET more than BJT and FET.

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