Electrical engineering MCQ Quiz Hub

Network Theory Set-6

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1. In the bilateral Laplace transform, the lower limit is?




2. The resistance element __________ while going from the time domain to frequency domain.




3. The relation between current and voltage in the case of inductor is?




4. The voltage and current in a capacitor are related as?




5. The transfer function of a system having the input as X(s) and output as Y(s) is?




6. Let us assume x (t) = A cos(ωt + φ), What is the final steady state solution for y (t)?




7. A voltage having the waveform of a sine curve is applied across a capacitor. When the frequency of the voltage is increased, what happens to the current through the capacitor?




8. A relay coil having voltage of magnitude 210 V and frequency 50 Hz is connected to a 210 V, 50 Hz supply. If it has resistance of 50 Ω and an inductance of 0.2 H, the apparent power is _____________




9. A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. A DC current of 1 mA produces a full-scale deflection of the instrument. The resistance of the instrument is 100 Ω. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is?




10. The value of 2 [u (t – 1) – u (1 – 2t)] (u ( t + 1) + u (t)) at t = 3 sec is ____________




11. Barlett’s Bisection Theorem is applicable to ___________




12. Given a sinusoidal voltage that has a peak to peak value of 100 V. The RMS value of the sinusoidal voltage is ___________




13. In a dual slop integrating type digital voltmeter, the first integrating is carried out for 50 periods of the supply frequency of 50 Hz. If the reference voltage used is 10 V, the total conversion time for an input of 40 V is?




14. In a dual slop integrating type digital voltmeter, the first integrating is carried out for 10 periods of the supply frequency of 50 Hz. If the reference voltage used is 2 V, the total conversion time for an input of 1 V is _________




15. A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. The internal resistance and a full-scale deflection produced by a DC current are 100 Ω and 1 mA respectively. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is _________




16. A 1 μF capacitor is connected across a 50 V battery. The battery is kept closed for a long time. The circuit current and voltage across capacitor is __________




17. The resistance of a 230 V, 100 W lamp is ____________




18. Two coils having self-inductances of 1 mH and 2 mH are mutually coupled. The maximum possible mutual inductance is ___________




19. A constant k band pass filter has a pass band from 100 to 400 Hz. The resonant frequency of series and shunt arms is ____________




20. In an unloaded transformer, the flux limiting the primary is 10 mWb and secondary is 30 mWb. The coefficient of coupling is ____________




21. Poles and zeros of a driving point function of a network are simple and alternate on jω axis. The network consists of ___________




22. In a two terminals network the open circuit voltage measured at the given terminals is 110 V and short circuit currents at the same terminals 10 A. If a load of 50 Ω resistance is connected at the terminals, load current is ___________




23. An RLC series circuit has R = 7.07 Ω, L = .707 H and C = 7.07 μF. At Half power frequencies the circuit impedance is ___________




24. Two similar coils have self-inductance of 20 mH each. Coefficient of coupling is 0.4. The mutual inductance M is ______________




25. For any given signal, average power in its 8 harmonic components as 50 mW each and fundamental component also has 50 mV power. Then, average power in the periodic signal is _______________




26. The Current Transformer supplies current to the current coil of a power factor meter, energy meter and, an ammeter. These are connected as?




27. A capacitor of 110 V, 50 Hz is needed for AC supply. The peak voltage of the capacitor should be ____________




28. Given I (t) = 10[1 + sin (- t)]. The RMS value of I(t) is ____________




29. A two branch parallel circuit has a 50 Ω resistance and 10 H inductance in one branch and a 1 μF capacitor in the second branch. It is fed from 220 V ac supply, at resonance, the input impedance of the circuit is _____________




30. The impedance matrices of two, two-port network are given by [3 2; 2 3] and [15 5; 5 25]. The impedance matrix of the resulting two-port network when the two networks are connected in series is ____________




31. The electrical energy required to heat a bucket of water to a certain temperature is 10 kWh. If heat losses, are 10%, the energy input is ____________




32. The current rating of a cable depends on ___________




33. In an AC circuit, the maximum and minimum values of power factor can be ___________




34. The impedance of an RC series circuit is 12 Ω at f = 50 Hz. At f = 200 Hz, the impedance will be?




35. A 3 phase balanced supply feeds a 3-phase unbalanced load. Power supplied to the load can be measured by ___________




36. A capacitor stores 0.15C at 5 V. Its capacitance is ____________




37. For a transmission line, open circuit and short circuit impedances are 10 Ω and 20 Ω. Then characteristic impedance is ____________




38. The real part of the complex frequency is called?




39. The imaginary part of the complex frequency is called?




40. The ratio of transform voltage to the transform current is defined as _________ of the resistor.




41. The ratio of transform current to the transform voltage is defined as ________ of the resistor.




42. The transform impedance of the inductor is?




43. The transform admittance of the inductor is?




44. The equivalent transform circuit contains an admittance of value ____ and equivalent transform current source.




45. The transform impedance of the capacitor is?




46. The transform admittance of the capacitor is?




47. The ratio of voltage transform at first port to the voltage transform at the second port is called?




48. The ratio of the current transform at one port to current transform at other port is called?




49. The ratio of voltage transform at the first port to the current transform at the second port is called?




50. The coefficients of the polynomials P (S) and Q (S) in the network function N (S) are ________ for passive network.