### AC Fundamentals Objectives Part 08

141 90<33.7Β°+25.5<11.3Β°=π.π<β45Β°.

142 When π£1=47sinπ and π£2=33(sinβ+20Β°) then (π£1βπ£2)is given by ππ.πππ¬π’π§(ββππΒ°).

143 The average power of an circuit is π¬ππ°πππ¨π¬β.
Question 144 and 145 refer to data given below:

144 If π£1=47sinπ and π£2=33(sinβ+20Β°) then (π£1+π£2)will be equal to ππ.ππ¬π’π§(β+π.πΒ°).

145 (π£1βπ£2)will be equal to ππ.πππ¬π’π§(ββππΒ°).

146 A certain 50 Hz current sine wave reaches 200 mA at π‘=2.5 ππ . The peak value of this current sine wave is 382.8 mA.
Question 147 and 149 refer to data given below:
Sine wave A has a peak and amplitude of 50 V and a frequency of 60 Hz. Sine wave B has a peak amplitude of 30 V at the same frequency and leads sine wave A by 45Β°,

147 The expression for wave B is πππ¬π’π§(πππ π+ππ).

148 At π‘=1 ms the instantaneous value of A will be 18.5 V.

149 At π‘=1 ms the instantaneous value of B will be 27.5 V.

50 When π£1=115<0Β°, π£2=115<-120Β° and π1=22<73Β°, the π=π£1+π£2π1 will be equal to π.ππ<β133Β°.

151 For the voltage waveform shown in figure, the frequency is 16 kHz.

152 When π£1 = 10 sin π, π£2 = 15 sin(π β 15Β°), π£3 = 20 sin(π + 10Β°) and π£4 =
18 sin(π + 25Β°) then the resultant of π£1 + π£2 + π£3 β π£4 will be ππ π¬π’π§(β β ππ. πΒ°).
Question 153 and 154 refer to data given below:
π£1 = 45 < 30Β°, π£2 = 27 < 21Β°, π£3 = 30 < 42Β°

153 (π£1 + π£2 β π£3) will be equal to ππ. π < 16.1Β°.

154 (π£1 β π£2 β π£3) will be equal to ππ. π < 220.7Β°.

155 Match the following:Wave Form factor(a) Sine (i) 1.0(b) Half wave rectified sin wave (ii) 1.11
(c) Rectangular (iii) 1.16(d) Triangular (iv) 1.57π β (ππ), π β (ππ), π β (π), π β(iii).

## Chapter # 4 RLC Circuits

156 A capacitor offers easy path to a.c. but blocks d.c.

157 The unit of inductive susceptance is Siemens.

158 An inductor supplied with 50 V ac with a frequency of 10 kHz passes a current of 7.96 mA. The value of inductor is 100 mH

159 When a 100-mA alternating current with a frequency of 1 kHz flows in the primary of two
coupled coils, the secondary voltage is 1 V. The mutual inductance between the coils is I.59 mH.

60 In a.c. circuit, the power is consumed only in r e s i s t a n c e .