AC Fundamentals, Circuits, and Circuit Theory

This is an MCQ-based quiz on AC Fundamentals, Circuits, and Circuit Theory.

This includes Resistive, Inductive, Capacitive, Average voltage, r.m.s. voltage, and Peak voltage.

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Which of the following refers to a parallel circuit?

The current through each element is same The voltage across element is in proportion to it's resistance value The equivalent resistance is greater than any one of the resistors The current through any one element is less than the source current

In any A.C. circuit always

Apparent power is more than actual power Reactive power is more than apparent power Actual power is more than reactive power Reactive power is more than actual power

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

The inductance of a coil can be increased by

Increasing core length Decreasing the number of turns Decreasing the diameter of the former Choosing core material having high relative permeability

Power factor of an electrical circuit is equal to

R/Z Cosine of phase angle difference between current and voltage Ratio of useful current to total current Iw/I All above

The ratio of active power to apparent power is known as which factor?

Form Load Power Demand

The time constant of a series R-C circuit is given by

RC R/C RC2 R2C

The power factor at resonance in R-L-C parallel circuit is

Unity Zero 0.8 leading 0.08 lagging

The period of a wave is

Expressed in amperes The same as frequency Time required to complete one cycle None of the above

Which of the following coil will have large resonant frequency?

A coil with low resistance A coil with large resistance A coil with low distributed capacitance A coil with large distributed capacitance

The double energy transient occur in the

R-L circuit R-C circuit R-L-C circuit Purely inductive circuit

The power factor of a D.C. circuit is always

Unity Zero Less than unity Greater than unity

In a series resonant circuit, the impedance of the circuit is

Zero Minimum Maximum None of the above

Power factor of an inductive circuit is usually improved by connecting capacitor to it in

Series Parallel Both A & B None of the above

Which of the following circuit component opposes the change in the circuit voltage ?

Inductance Resistance Capacitance Conductance
Quiz/Test Summary
Title: AC Fundamentals, Circuits, and Circuit Theory
Questions: 15
Contributed by:
Diego