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4

The power factor of a circuit is equal to

A. RZ

B. XC/Z

C. XL/Z

D. R/Z

Correct Answer :

D. R/Z


Related Questions

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4

How many degrees of phase represents one full cycle?

A.

B.

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4

Which of the following elements is active?

A. Resistor

B. Inductor

C. Capacitor

D. Ideal voltage source

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4

A term used to express the amount of electrical energy stored in electrostatic field.

A. Joules

B. Coulombs

C. Watts

D. Electron-volt

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4

The impedance in the study of electronics is represented by resistan

A. Inductance

B. Capacitance

C. Inductance and capacitance

D. Reactance

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4

Which statement is true?

A. A series resonant circuit is of high impedance

B. A parallel resonant circuit is of low impedance

C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

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4

High resistance values are a consequence of the ___ of the film.

A. Thickness

B. Length

C. Thinness

D. Area

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4

An impedance given by 90 -45� is a/an ___ impedance.

A. Inductive

B. Conductive

C. Resistive

D. Capacitive

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4

Which of the following represents the energy stored in a cap

A. CV2/2

B. 2Q2/C

C. C2/V

D. CV

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4

A three-by-threea series-parallel matrix of resistorsa all having the same ohmic valuea would have a net resistance of

A. One-third the value of a single resistor

B. Three times the value of a single resistor

C. The same value as a single resistor

D. Nine times the value of a single resistor

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4

When two coils of identical reactance are in parallel without mutual inductancea the reactance of the combination is ___ the reactance of each coil.

A. One half

B. Twice

C. Four times

D. One fourth

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4

The distance between the capacitor plates increases two timesa then its capacitance

A. Increases two times

B. Increases four times

C. Decreases two times

D. Decreases four times

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4

The internal resistance of an ideal current source is

A. Infinite

B. Zero

C. Equal to the load resistance

D. To be determined

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4

An open inductor has

A. Zero resistance and infinite inductance

B. Infinite resistance and zero inductance

C. Infinite resistance and infinite inductance

D. Zero resistance and zero inductance

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4

Of the equivalent combination of unitsa which one is not equal to watt?

A. 2/V

B. AV

C. A2

D. J/s

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4

When the power factor of a circuit is zeroa

A. Power absorbed is maximum

B. Power absorbed is minimum

C. Power absorbed is zero

D. The impedance is minimum

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4

The arc across a switch when it open an RL circuit is a result of the

A. Large self-induced voltage across L

B. Long time constant

C. Low resistance of the open switch

D. Surge of resistance

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4

An inductive load always has a ___ power factor

A. Leading

B. Lagging

C. Zero

D. Unity

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4

The superposition theorem is used when the circuit contains

A. Reactive elements

B. Active elements

C. Number of voltage sources

D. Single voltage source

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4

A circuit whose parameters change with voltage or current.

A. Non-linear circuit

B. Linear circuit

C. Complex circuit

D. Passive circuit

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4

For a parallel ACcircuita ___ is used as a reference phasor.

A. Voltage

B. Power

C. Current

D. Resistance

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4

A capacitor consists of two

A. Conductors only

B. Dielectric only

C. Conductors separated by a dielectric

D. Dielectric separated by a conductor

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4

What is the purpose of a load in an electric circuit?

A. To increase the circuit current

B. To decrease the circuit current

C. To utilize electrical energy

D. To make the circuit complete

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4

A capacitor is used to

A. Block dc current

B. Pass dc current

C. Open voltage source

D. Short the voltage source

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4

The maximum power transfer theorem is used in

A. Power system

B. Electronic system

C. Refrigeration

D. Air conditioning

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4

What is the rms value of a square wave?

A. Equals its peak value

B. Equals its peak-to-peak value

C. Peak divided by square root of two

D. Peak divided by pi

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4

The Q-factor of a series resonant circuit is also known as

A. Current magnification factor

B. Voltage magnification factor

C. Load factor

D. Leakage factor

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4

In an ac circuit with inductive reactance ?, the

A. Phase angle of the circuit is always 45�

B. Voltage across the inductance must be 90� out o f-phase witht he applied voltage

C. Current through the inductance lags its induced voltage by 90�

D. Current through the inductance and voltage across it are180� outof-phase

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4

The Q-factor of a parallel resonant circuit is also known as

A. Current magnification factor

B. Voltage magnification factor

C. Load factor

D. Leakage factor

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4

For a linear circuita ___ voltage or current is used to calculate average power.

A. Rms

B. Peak

C. Average

D. Instantaneous

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4

The average value of a triangular or sawtooth wave is _____ times its peak value.

A.

B.