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**Home⇒ Engineering⇒ Ac basic**

1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |

2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |

Q1 ⇒ Power factor of the following circuit will be zeroboth (b) and (c).[other wrong options] [Discuss in forum] resistive. inductive. capacitive |

Q2 ⇒ A 100 W, 100 V bulb is to be supplied from 220 V, 50Hz supply.
Which of the following arrangements is preferable?Additional pure inductance in series with lamp.[other wrong options] [Discuss in forum] Additional resistance in series with the lamp. Additional inductance and capacitance in series with the lamp. |

Q3 ⇒ Capacitive susceptance is a measure ofa purely capacitive circuit' s ability to pass current.[other wrong options] [Discuss in forum] a purely capacitive circuit' s ability to resist the flow of current. the extent of neutralization of reactive power in a circuit. reactive power in a circuit. |

Q4 ⇒ In a series RLC circuit at resonance, the magnitude of voltage
developed across the capacitorcan be greater than the inpu voltage however, it is 90° out of
phase with the input voltage.[other wrong options] [Discuss in forum] is always zero. can never be greater than the input voltage. can be greater than the input voltage and is in phase with the input voltage. |

Q5 ⇒ A high Q coil haslow losses.[other wrong options] [Discuss in forum] large bandwidth. high losses. flat response. |

Q6 ⇒ Tn an R-L-C series resonant circuit, if inductance of the circuit is
made double and the capacitance is made half, which of the
following will be affected?Selectivity of the circuit[other wrong options] [Discuss in forum] Resonant frequency Current at resonant frequency Impedance at resonant frequency |

Q7 ⇒ According to maximum power transfer theorem, when is the
maximum power absorbed by one network from another network?The impedance of one is the complex conjugate of the other.[other wrong options] [Discuss in forum] The impedance of one of the networks is half that of the other. The impedance of one is equal to that of the other. Only the resistive parts of both are equal. |

Q8 ⇒ To improve the pf in three-phase circuits, the capacitor bank is
connected in delta to makecapacitance very small.[other wrong options] [Discuss in forum] capacitance calculation easy. the connection elegant. the pf correction more effective. |

Q9 ⇒ In a 3-phase supply, floating neutral is undesirable because it may
result in ____across the load.unequal line voltages[other wrong options] [Discuss in forum] high voltage low voltage |

Q10 ⇒ An even waveform when expressed in exponential fourier series
will containonly real coefficient[other wrong options] [Discuss in forum] only imaginary coefficient both of (a) and (b). none of these. |

Q11 ⇒ A component that opposes the change in circuit current isinductance.[other wrong options] [Discuss in forum] resistance. capacitance. conductance. |

Q12 ⇒ Laplace transform of the output response of a linear system is the
system transfer function when the input isan impulse signal[other wrong options] [Discuss in forum] a step signal a ramp signal. a sinusoidal signal. |

Q13 ⇒ The rms value of the resultant current in a wire which carries a dc
current of 10 A and a sinusoidal alternating current of peak value
20 A is17.3 A[other wrong options] [Discuss in forum] 14.1 A 22.4 A 30.0 A |

Q14 ⇒ A pure capacitance connected across 50 Hz, 230 V supply
consumes 0.04 W. This consumption is attributed toboth (a) and (b).[other wrong options] [Discuss in forum] ohmic loss due to ohmic resistance of plates loss of energy in dielectric. capacitive reactance in ohms. |

Q15 ⇒ The power consumed in an inductive circuit will beVI cos φ[other wrong options] [Discuss in forum] VI sin φ VI none of these. |

Q16 ⇒ two terminal black box contains one of the R-L-C elements. The
black box is connected to a 220 V ac supply. The current through
the source is I. When a capacitance of 0.1 F is inserted in series
between the source and the box, the current through the source is
2 I. The element isan inductance.[other wrong options] [Discuss in forum] a resistance. a capacitance. it is not possible to determine the element. |

Q17 ⇒ A resistance of 'R'ω and inductance 'L' H are connected across
240 V, 50Hz supply. Power dissipated in the circuit is 100 W and
the voltage across R is 100 V. In order to improve the pf to unity,
the capacitor that is to be connected in series should have a value of43.7 µF[other wrong options] [Discuss in forum] 4.37 µF 437 µF 4.37 mF |

Q18 ⇒ A coil having a resistance of 5 ω and inductance of 0.1 H is
connected in series with a condenser of capacitance 50 pF. A
constant alternating voltage of 200 V is applied to the circuit. The
voltage across the coil at resonance is1,800 volts[other wrong options] [Discuss in forum] 200 volts 1,788 volts 2,000 volts |

Q19 ⇒ Consider the following statementsregarding the frequency response curve of a series R-L-C circuit. 1. At half power freqLlencies, the current in the circuit is onehalf of the current at resonant frequencies. 2. At half-power frequencies, the power factor angle of the circuit is 45°. 3. At resonant frequency, the power factor angle of the circuit is 4. Maximum power occurs at resonant frequency. 2 and 4 are correct.[other wrong options] [Discuss in forum] 1, 2 and 4 are correct. 1, 2 and 3 are correct 1 and 4 are correct. |

Q20 ⇒ parallel circuit is said to be in resonance when the admittance is
purelyconductive.[other wrong options] [Discuss in forum] capacitive. inductive. susceptive. |

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