- Home
- Category
- Electrical Engineering Questions
- AC Fundamentals, Circuits & Circuit Theory Mcqs
- AC Fundamentals, Circuits & Circuit Theory Mcqs - Set 3
MCQs 1: Power factor of the system is kept high__________?
to reduce line losses
to maximise the utilization of the capacities of generators, lines and transformers
to reduce voltage regulation of the line
due to all above reasons
MCQs 2: In a loss-free R-L-C circuit the transient current is__________?
MCQs 3: The square waveform of current has following relation between r.m.s. value and average value?
r.m.s. value is equal to average value
r.m.s. value of current is greater than average value
r.m.s. value of current is less than average value
none of the above
MCQs 4: The time constant of the capacitance circuit is defined as the time during which voltage________?
falls to 36.8% of its final steady value
rises to 38.6% of its final steady value
rises to 63.2% of its final steady value
none of the above
MCQs 5: The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?
the more heat than produced by A.C. when flowing through the same circuit
the same heat as produced by A.C. when flowing through the same circuit
the less heat than produced by A.C. flowing through the same circuit
none of the above
MCQs 6: In a circuit containing R, L and C, power loss can take place in____________?
MCQs 7: In a pure resistive circuit__________?
current lags behind the voltage by 90°
current leads the voltage by 90°
current can lead or lag the voltage by 90°
current is in phase with the voltage
MCQs 8: The transient currents are associated with the____________?
changes in the stored energy in the inductors and capacitors
impedance of the circuit
applied voltage to the circuit
resistance of the circuit
MCQs 9: In the case of an unsymmetrical alternating current the average value must always be taken over__________?
MCQs 10: In a pure inductive circuit___________?
the current is in phase with the voltage
the current lags behind the voltage by 90°
the current leads the voltage by 90°
the current can lead or lag by 90°
MCQs 11: The power factor at resonance in R-L- C parallel circuit is________?
MCQs 12: In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?
MCQs 13: When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?
MCQs 14: A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
the capacitive reactance in ohms
the current flowing in capacitor
the size of the capacitor being quite big
the statement is incorrect
MCQs 15: The product of apparent power and cosine of the phase angle between circuit voltage and current is
MCQs 16: An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?
the current through the resistance is more
the current through the resistance is less
both resistance and inductance carry equal currents
none of the above
MCQs 17: In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
MCQs 18: In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?
MCQs 19: The power factor of a D.C. circuit is always__________?
MCQs 20: The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?
ABOUT US
Category
Who We Are