### 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.

- 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.