AC FUNDAMENTALS, CIRCUIT AND CIRCUIT THEORY QUIZ

In AC. circuits, laminated iron is invariably used in order to

Reduce eddy current loss

Increase heat radiation

Reduce circuit permeability

Make assembly cheap and easier

TRUE ANSWER : ?
YOUR ANSWER : ?

The r.m.s. value of pure cosine function is

0.707 of peak value

0.5 of peak value

Zero

Same as peak value

TRUE ANSWER : ?
YOUR ANSWER : ?

Inductance of a coil Varies

Inversely as the length of the iron path

Both of the listed here

Directly as the cross-sectional area of magnetic core

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

In a pure resistive circuit

Current is in phase with the voltage

Current lags behind the voltage by 90°

None of the listed here

Current can lead or lag the voltage by 90°

TRUE ANSWER : ?
YOUR ANSWER : ?

The purpose of a parallel circuit resonance is to magnify

Frequency

Power

Current

Voltage

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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 less

The current through the resistance is more

None of the listed here

Both resistance and inductance carry equal currents

TRUE ANSWER : ?
YOUR ANSWER : ?

For a sine wave with peak value Emax ___________ the average value is

None of the listed here

0.707 Emax

0.636 Emax

0.434 Emax

TRUE ANSWER : ?
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At very low frequencies a series R-C circuit behaves as almost purely

Capacitive

Inductive

Resistive

None of the listed here

TRUE ANSWER : ?
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Which of the following coil will have large resonant frequency?

A coil with low distributed capacitance

A coil with low resistance

A coil with large distributed capacitance

A coil with large resistance

TRUE ANSWER : ?
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Power factor of an inductive circuit is usually improved by connecting capacitor to it in

Parallel

Series

None of the listed here

Both parallel and series

TRUE ANSWER : ?
YOUR ANSWER : ?

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