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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

Correct Answer :

C. Power absorbed is zero


Related Questions

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4

What does a capacitor store?

A. Voltage

B. Charge

C. Current

D. Power

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4

The graph between an alternating quantity and time is called

A. Sine wave

B. Curve

C. Waveform

D. A plot

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4

VL= VCin a series RLCcircuit when

A. The value of the impedance is minimum

B. The power factor is zero

C. The current leads the total voltage by 90�

D. The total voltage is zero

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4

What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?

A. Surge

B. Stray

C. Natural

D. Normal

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4

A series RLCcircuit has a ______ power factor at its half-power points

A. Unity

B. Leading

C. Lagging

D. Either B or C

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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 total resistance of a two equal valued resistors in series?

A. The difference of both

B. The product of both

C. Twice as one

D. The sum of their reciprocals

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4

A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20a000 ohms?

A.

B.

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4

Which of the following is a disadvantage of a wire-wound resistor?

A. It has reactance in radio-frequency circuits

B. It cannot handle much power

C. It draws a large amount of current

D. It cannot handle high voltage

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4

Which of the statements below is not true?

A. Current source is an active element

B. Resistor is a linear element

C. Voltage source is a passive element

D. Diode is a non-linear element

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4

In an ac circuit with a resistive branch and an inductive branch in parallela the

A. Voltage across the inductance leads the voltage across the resistance by 90°

B. Resistive branch current is 90° out of phase with the inductive branch current

C. Resistive and inductive branch currents have the same phase

D. Resistive and inductive branch currents are 180° outof-phase

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4

When two complex conjugates are subtracteda the result is a

A. Quadrature component only

B. Complex component

C. In-phase component

D. Real component

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4

The charge in the capacitor is stored at the

A. Terminals

B. Plates

C. Dielectric

D. Air

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4

In a rectangular wavea the form factor is

A.

B.

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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

Which waveform in which the rms value and the mean value are equal?

A. Square wave

B. Triangular wave

C. Sine wave

D. Sawtooth

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4

If two equal resistances connected in series across a certain supply are now connected in parallel across the same supplya the power produced will be _____ that of series connection

A. One-half

B. One-fourth

C. Two times

D. Four times

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4

In a circuita an active element is one which

A. Supplies energy

B. Receives energy

C. Both supplies and receives energy

D. Amplifies signal

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4

The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.

A. Algebraic

B. Arithmetic

C. Vector

D. Phasor

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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

In dividing or multiplying phasor quantitiesa ___ form is used.

A. Polar

B. Rectangular

C. Trigonometric

D. Exponential

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4

A capacitance of 0.05 F equals

A. 0.05 x 106F

B. 0.05 x 10-6F

C. 0.05 x 10-12F

D. 0.05 x 1012F

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4

A capacitor requires 12 C of charge to raise its potential of 3 V. What is the capacitance of the capacitor?

A. 36 F

B. 15 F

C. 0.25 F

D. 4 F

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4

Norton�s theorem is what form of an ac equivalent circuit?

A. Voltage

B. Current

C. Both voltage and current

D. Neither voltage nor current

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4

Which is considered as the effect of a dielectric material?

A. Increasing capacitance

B. Decreasing capacitance

C. Reducing the working voltage

D. Increasing the distance between the plates

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4

And ideal current source has an internal conductance of _____ siem

A. Infinite

B. One

C. Zero

D. One million

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4

Liquids that are good conductors because of ionization are called

A. Electrolytic

B. Bases

C. Acid

D. Electrolytes

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4

What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?

A. 1.65 kHz

B. 16.5 MHz

C. 16.5 kHz

D. 165 kHz

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4

When capacitors are connected in seriesa the total capacitance is

A. Smaller than the smallest capacitor

B. Smaller than the largest capacitor

C. Greater than any of the capacitor

D. Greater than the largest capacitor

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4

Under the conditions of maximum power transfera a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?

A. 60 W

B. 30 W

C. 15 W

D. 4 W