# Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-11

151. In the given circuit, the Kirchhoff’s current law at the point A is applied. Which of the following relation is correct

a) I1 = I2- I3
b) I1 - I3+ I3=0
c) I1- (I2+ I3 )=0
d) I1= -(I2+ I3 )

Ans: (c)

152. The voltage source of 220 V shown in the figure will deliver the total current to the circuit of

a) 4 A
b) 2 A
c) 50 A
d) 100 A

Ans: (c)

153. An inductance coil of 10 H develops the counter voltage of 50 volts. What should be the rate change of current in the coil ?

a) 5 A/sec
b) 10 A/sec
c) 1 A/sec
d) 100 A/sec

Ans: (a)

154. An peak value of the sinusoidal voltage is 10 volts. What will be the effective of voltage ?

a) 14.14 volts
b) 1.414 volts
c) 0.707 volts
d) 7.07 volts

Ans: (d)

155. If the effective voltage of the sinusoidal voltage is 11 volts. What will be the average value of sinusoidal voltage ?

a) 5 volts
b) 10 volts
c) 1.1 volts
d) 11 volts
e) 121 volts

Ans: (b)

156. If a conductor is put in a magnetic field, at what angle the conductor should cut the magnetic field to induce maximum current in it ?

a) 10°
b) 20°
c) 90°
d) 120°
e) 180°
f) -90°

Ans: (c)

157. For which of the following parameter variation, the capacitance of the capacitor remains unaffected ?

a) Nature of dielectric
b) Thickness of the plates
c) Distance between the plates
d) Area of the plates

Ans: (b)

158. If two capacitors with 20 μF capacitance each are connected in series. What will be the net capacitance of the circuit ?

a) 10 μF
b) 20 μF
c) 40 μF
d) 80 μF

Ans: (a)

159.In the above question, if the capacitors are connected in parallel, what will be the net capacitance ?

a) 40 μF
b) 20 μF
c) 10 μF
d) 30 μF

Ans: (a)

160. The three vector diagrams are shown below. While of the diagram is for pure resistance circuit.

161. In the vector diagrams shown in Q.160, diagram (a) corresponds to

a) Pure inductive circuit
b) Pure resistive circuit
c) Pure resistive circuit
d) None of the above

Ans: (b)

162. In the vector diagrams shown in Q. 160 the diagram (b) corresponds to

a) Pure inductive circuit
b) Pure resistive circuit
c) Pure capacitive circuit

Ans: (a)

163. Which of the following expression is true for apparent power in an AC circuit ?

a) Vr.m.s.×Ir.m.s.
b) Vmean×Imean
c) Vpeak×Ipeak
d) V I cos⁡ϕ

Ans: (a)

164. The sum of the rms potentials in the RC circuit does not follow the Kirchhoff’s law.

a) True
b) False

Ans: (a)

165. The power dissipation in the pure capacitance of RC circuit will be

a) Zero
b) Small
c) Higher than dissipation in resistance
d) Equal to dissipation in resistance

Ans: (a)