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4

A coil of inductance L has an inductive reactance of XLin an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is

A.

B. I2XL

C. IXL

D. IXL2

Correct Answer :

A.


Related Questions

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4

Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is

A. Positive

B. Negative

C. Zero

D. Infinite

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4

When capacitors are connected in parallela the total capacitance is

A. Greater than the largest capacitor

B. Smaller than the largest capacitor

C. Smaller than the smallest capacitor

D. Greater than the smallest capacitor

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4

A real current source has

A. Infinite internal resistance

B. Zero internal resistance

C. Large internal resistance

D. Small internal resistance

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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

For a series ACcircuita ___ is not used as a reference phasor.

A. Voltage

B. Impedance

C. Current

D. Conductance

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4

Which of the following is a preferred resistor value?

A.

B.

C. 43a000

D. 54a321

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4

What is the conductance of a circuit having three 10 resistors in parallel?

A. 0.3 S

B. 3.33 S

C. 0.33 S

D. 30 S

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4

The charging of a capacitor through a resistance obeys

A. Exponential law

B. Logarithmic law

C. Linear law

D. Square law

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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

If two complex conjugates are addeda ___ components results.

A. In-phase

B. Quadrature

C. Complex

D. Outof-phase

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4

Which of the following does not refer to electrical energy?

A. Volt-ampere

B. Joule

C. Watt-second

D. Volt-coulomb

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4

What is the temperature coefficient of the resistance Eureka?

A. Infinity

B. Negative

C. Almost zero

D. Positive

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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

³Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR�. This states

A. Compensation theorem

B. Reciprocity theorem

C. Millman�s theorem

D. Superposition theorem

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4

In an ac wavea 30 degrees of phase is ___ of a cycle.

A. ½

B.

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4

Which of the following is not considered a physical factor affecting resistance?

A. Length

B. Material type

C. Temperature

D. Cross-sectional

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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

What maximum voltage can be applied across the capacitor of time?

A. Working voltage

B. Surge voltage

C. Stray voltage

D. Peak voltage

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4

In liquids and gasesa ionization current results from a flow of

A. Positive or negative ions

B. Free electrons

C. Ions that are lighter in weight than electrons

D. Protons

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4

What is a rotating vector whose projection can represent either current or voltage in an ac circuit?

A. Polar diagram

B. Scalar quantity

C. Velocity

D. Phasor

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4

Points to be considered in choosing a capacitor

A. Working voltage

B. Type of dielectric

C. Capacitance

D. All of the above

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4

In an RL series circuita

A. Current lags voltage by less than 90�

B. Current lags voltage by 180�

C. Current lags voltage by 90�

D. Current leads voltage by 90�

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4

In an ac circuita the power dissipated as heat depends on

A. Impedance

B. Capacitive reactance

C. Resistance

D. Inductive reactance

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4

Which of the following is a way of decreasing mutual inductance?

A. Moving the coils closer

B. Moving the coils apart

C. Decreasing the number of turns of either coil

D. Increasing the number of turns of either coil

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4

The area of 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

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

The reason why electrical appliances are not connected in series.

A. Greater electrical power saving

B. Power loss is minimum

C. Appliances have different current ratings

D. All of the above

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4

Capacitance increase with

A. Larger plate area and less distance between plates

B. Larger plate area and greater distance between plates

C. Smaller plate area and less distance between plates

D. Higher values of applied voltage

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4

When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its reactance of frequency 2f is

A. Inductive

B. Capacitive

C. Resistive

D. Infinite

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4

If a capacitor is rated for 200V dca what is its effective ac working voltage?

A. 50 V

B. 100 V

C. 200 V

D. 400 V