AC Fundamentals Objectives Part 08

141 90<33.7Β°+25.5<11.3Β°=πŸ‘.πŸ“<βˆ’45Β°.

142 When 𝑣1=47sinπœƒ and 𝑣2=33(sinβˆ…+20Β°) then (𝑣1βˆ’π‘£2)is given by πŸπŸ—.πŸ“πŸ—π¬π’π§(βˆ…βˆ’πŸ‘πŸ“Β°).

143 The average power of an circuit is π‘¬π’—π‘°π’—πœπ¨π¬βˆ….
Question 144 and 145 refer to data given below:

144 If 𝑣1=47sinπœƒ and 𝑣2=33(sinβˆ…+20Β°) then (𝑣1+𝑣2)will be equal to πŸ•πŸ•.πŸ–π¬π’π§(βˆ…+πŸ–.πŸ‘Β°).

145 (𝑣1βˆ’π‘£2)will be equal to πŸπŸ—.πŸ“πŸ—π¬π’π§(βˆ…βˆ’πŸ‘πŸ“Β°).

146 A certain 50 Hz current sine wave reaches 200 mA at 𝑑=2.5 π‘šπ‘ . 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Ÿ‘πŸŽπ¬π’π§(πŸ‘πŸ•πŸ• 𝒕+π…πŸ’).

148 At 𝑑=1 ms the instantaneous value of A will be 18.5 V.

149 At 𝑑=1 ms the instantaneous value of B will be 27.5 V.

50 When 𝑣1=115<0Β°, 𝑣2=115<-120Β° and 𝑖1=22<73Β°, the 𝑍=𝑣1+𝑣2𝑖1 will be equal to πŸ“.πŸπŸ‘<βˆ’133Β°.

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

152 When 𝑣1 = 10 sin πœƒ, 𝑣2 = 15 sin(πœƒ βˆ’ 15Β°), 𝑣3 = 20 sin(πœƒ + 10Β°) and 𝑣4 =
18 sin(πœƒ + 25Β°) then the resultant of 𝑣1 + 𝑣2 + 𝑣3 βˆ’ 𝑣4 will be πŸ‘πŸŽ 𝐬𝐒𝐧(βˆ… βˆ’ πŸπŸ“. πŸ‘Β°).
Question 153 and 154 refer to data given below:
𝑣1 = 45 < 30Β°, 𝑣2 = 27 < 21Β°, 𝑣3 = 30 < 42Β°

153 (𝑣1 + 𝑣2 βˆ’ 𝑣3) will be equal to πŸ’πŸ‘. πŸ” < 16.1Β°.

154 (𝑣1 βˆ’ 𝑣2 βˆ’ 𝑣3) will be equal to 𝟏𝟏. 𝟐 < 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) 1.57𝒂 βˆ’ (π’Šπ’Š), 𝒃 βˆ’ (π’Šπ’—), 𝒄 βˆ’ (π’Š), 𝒅 βˆ’(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 .