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An inductor carries 2 A dc. If its inductance is 100 Ha then what is its inductive reactance?

A. Zero

B. 1.3 k

Correct Answer :

A. Zero


Related Questions

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Conventional flow assumes charges flow from

A. Positive to negative

B. Positive to positive

C. Negative to positive

D. Negative to negative

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Which one of the following elements serves as a protection against overload?

A. Fuse

B. Switch

C. Resistor

D. Relay

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A series RL circuit has R of 10 and XL of 5 a its impedance in rectangular form is given by

A. 10 +j 5

B. 10 + j 10

C. 10 ± j 5

D. 10 ± j 10

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The charging of a capacitor through a resistance follows what law?

A. Linear law

B. Hyperbolic law

C. Inverse-square law

D. Exponential law

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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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Electric energy refers to

A. Volt divided by coulomb

B. Voltampere

C. Volt-coulomb

D. Watt divided by time

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The temperature-resistance coefficient of pure gold is

A.

B.

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When two pure sine waves of the same frequency and the same amplitude which are exactly 180� outof-phase are added togethera the result is

A. A wave with twice the amplitude

B. A wave with half the amplitude

C. Zero signal

D. A wave with twice the frequency

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A capacitor opposes change in

A. Voltage

B. Current

C. Voltage and current

D. Neither voltage nor current

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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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What is the other name of relative permittivity?

A. Dielectric strength

B. Potential gradient

C. Breakdown voltage

D. Specific inductance capacity

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Why are inductance and capacitance not relevant in a dc circuit?

A. Because it is a simple circuit

B. Because dc circuits require only resistance as load

C. Because they do not exist in a dc circuit

D. Because frequency of dc is zero

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Refers specifically to steady state values of quantities in ac circuits which are complex numbers.

A. Domain

B. Scalar quantity

C. Vector quantity

D. Phasor quantity

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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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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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Which statement is true about a passive circuit?

A. A circuit with neither a source of current nor a source of potential difference

B. A circuit with a voltage source

C. A circuit with a current source

D. A circuit with only resistance as a load

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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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When current and voltage arte in phase in an ac circuita the ___ is equal to zero.

A. Resistance

B. Reactance

C. Inductance

D. Capacitance

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Which of the following does not affect resistance?

A. Resistivity

B. Cross-sectional area

C. Mass

D. Length

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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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The current is ____ times the maximum current at half-power points of a resonance curve.

A.

B.

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The curve between current and frequency is termed as

A. Voltage curve

B. Gain curve

C. Power curve

D. Resonance curve

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When two unequal values of resistors are connected in parallel across a dc sourcea greater current flows through the

A. Higher resistance

B. Lower resistance

C. Higher wattage resistance

D. Lower wattage resistance

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For a triangular and sawtooth waveform the rms voltage or current equals

A. 0.707times peak value

B. 0.577 times peak value

C. 0.577times average value

D. 0.707times rms value

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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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Form its definitiona the unit of electric fielda is the N/C and equivalent unit of is the

A. V(m)2

B. V(m)

C. V/m2

D. V/m

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The ohmic value of a resistor with negative temperature coefficient

A. Increases with increasing temperature

B. Increase with decreasing temperature

C. Stays unchanged with temperature change

D. Stays unaffected even with increasing temperature

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Which of the following describes the action of a capacitor?

A. Stores electrical energy

B. Opposes changes in current flow

C. Creates a dc resistance

D. Converts ac to dc

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The graph between an alternating quantity and time is called

A. Sine wave

B. Curve

C. Waveform

D. A plot

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For a carbon composition resistora typical resistance values range from

A. 2.7 to 22 M

B. 1000 to 10000

C. 10 to 10 M

D. 2.7 to 2.7G