### RLC Circuits Objectives PART 02

21 Questions 21 and 22 refer to data given below: A certain cast-iron core has a length of 10
cm and a cross-sectional area of 6 cm’. A coil of 150 turns is wound around the core and is
passing a current of 4 A. The mmf is 600 A-t.

22 The flux in the core is 5.7 x 10-4 Wb.

23 Questions 23 and 24 refer to figures given below: In which of the circuit the lamp will
be brightest: circuit C.

24 In which of the circuit the lamp will be dimmest: circuit A.

1. Questions 25 to 29 refer to Fig given below. What will be the effect of increased R
?Emf induced in the secondary will be less.

26 Increase in the number of primary turns will result in larger emf in secondary.

27 Increase in the number of secondary turns will result in larger secondary emf.

28 The average power dissipated in a pure inductor is zero.

29 By reversing the battery terminal polarity of induced emf will reversed.

30 Question 30 and 31 refer to the figure below:In which circuit will the lamp be brightest:Circuit A

31 in which circuit will the lamp be dimmest: Circuit C

32 Question 32 and 33refer to the figure below: which circuit have least rms
current.circuit B

33 which circuit have highest rms:circuit C

34 Wattles current is possible only in non-resistive circuits.

35 A series RL circuit is to operate at frequencies in the range of 100 Hz, 600 Hz. It is required
that the current lags the source voltage by at least30° over this range. IfR = 1000 ohms, the
appropriate value of L will be 0.92 H.

36 Questions 36 and 37 refer to figures below : 36. For the circuit shown, as the .frequency of
source voltage increases, the value of which of the following two parameters will increases?
VI. and Z.

37 the value of which of the following two parameters will decreases Z and Vr..

38 Questions 38 and 39 refer to data given below: A series RL circuit draws 15 mA of current
from a 120-V, 60 Hz source. The current lags the voltage by 60°. The value of R must be
4kohms.

39 The value of inductance must be 18.3Mh.

40 Questions 40 to 43 refer to figure below: A series R-L circuit contains R = 2 Icrl and X =
1 ka. The rms value of current in the circuit is 5 mA. The source voltage must be11.2V.