### RLC Circuits Objectives PART 03

41 The phase angle between E, and/ is 26.5°.

42 The phase angle between E,and voltage across inductor is 63.5°.

43 The phase angle between E, and voltage across resister is26.5°.

44 A 1 mH inductance and 10 4F capacitance when connected in series to an a.c. source, possess
equal reactance. The angular frequency of the a.c. source is104 .

45 For a series RC circuit V, is measured to be 4 V and Vc is measured as 3 V. The ac source voltage
must be5 V.

46 Questions 46 and 47 refer to figure below: The variation of impedance with frequency is
shown in figure. Four zones P, Q, R and S have been marked on the curve. In which zone the
impedance Z is almost pure resistance ?P.

47 In which zone the impedance Z is almost pure inductance? S

1. Questions 48 and 50 refer to figure below.As the frequency increases, the value of which
of the following parameter increases? I.

49 As the frequency increases, the values of which of the following decreases ?Vc.

50 In a series RC circuit as frequency increasesCurrent increases.

51 The minimum and maximum values of power factor in a ac circuit are 0 and 1.

52 Questions 52 to 56 refer to figure below :When the switch is closed at t=0 the value of
charging current will be 60 mA.

53 What voltage does the capacitor have to reach before the charging current has dropped to 20
mA. 8V.

54 The initial rate of increase of capacitor voltage is 12 kV/S.

55 At what rate is the capacitor voltage increasing 16 when the capacitor voltage is 8 V ? 4
kV/S.

56 The time constant for the circuit is1ms.

57 A 10 kHz voltage is applied to a certain device. The waveforms of voltage and current are displayed
on the oscilloscope and appear as shown in Fig. 21 From the wave form which of the
following conclusion can be drawn ? The device is a 0.639 p.F capacitor.

58 The waveforms of voltage and current are displayed on the oscilloscope and appear as shown in
figure. From the waveform which of the following conclusion can be drawn ?The device is 1.6
kohmresistors.

59 Questions 59 and 61 refer to data given below:In the seriesLCR circuit shown in figure
supply voltage is 10 volts.1 MHz.

60 The current through the circuit will be lowest at which of the following frequency? 250 kHz.