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4

The reciprocal of a complex number is

A. A complex number

B. A real number

C. An imaginary number

D. A whole number

Correct Answer :

A. A complex number


Related Questions

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4

What is the total capacitance of 10 capacitorsa each of 20 F in series?

A. 200 F

B. 2 F

C. 100 F

D. 0.5 F

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4

At parallel resonancea the currents flowing through L and C are

A. Infinite

B. Zero

C. Unequal

D. Equal

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4

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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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

How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?

A. 2.592 x 105C

B. 2.592 x 103 C

C. 2.592 x 108 C

D. 2.592 x 1012 C

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4

A series RLCcircuit consists of a 10 resistor in series with L = 10 Ha and C= 100 F. Determine a new value of Ia for which the resonant frequency is one ±half the original value.

A. 40 H

B. 40 mH

C. 40 pH

D. 40 nH

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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

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4

In a circuita a passive element is one which

A. Supplies energy

B. Receives energy

C. Both supplies and receives energy

D. Attenuates signal

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4

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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4

In adding or subtracting phasor quantitiesa ___ form is the most convenient.

A. Polar

B. Rectangular

C. Trigonometric

D. Exponential

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4

The unit of elastance is

A. Farad

B. Daraf

C. Siemen

D. Henry

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4

The ratio of the flux density to the electric field intensity in the dielectric is called

A. Permittivity

B. Field intensity

C. Permeability

D. Elasticity

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4

Resistor with colored bands in the body

A. Wire-wound resistor

B. Carbon-composition resistor

C. Potentiometer

D. Rheostat

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4

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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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

Inductive reactance applies only to sine waves because it

A. Increases with lower frequencies

B. Increases with lower inductance

C. Depends on the factor 2

D. Decreases with higher frequencies

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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

What theorem is usually used in the analysis of transistor circuit?

A. Superposition theorem

B. Millman�s theorem

C. Thevenin�s theorem

D. Norton�s theorem

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4

Which of the following is the peakiest?

A. Square wave

B. Sinusoidal wave

C. Triangular wave

D. Rectangular wave

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4

Series resonance occurs when

A. XL= XC

B. XL= R

C. Z = R

D. Both A and C

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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

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

In a multiple capacitora the plate area is

A. Increased

B. The same

C. Decreased

D. Variable

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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

In a series circuit with unequal resistances the

A. Highest R has the highest V

B. Lowest R has the highest V

C. Lowest R has the highest I

D. Highest R has the highest I

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4

In a complex number 5 + j 10a 10 is called ___ part.

A. Imaginary

B. Real

C. Conjugate

D. Integer

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4

The farad is not equivalent to which of the following combination of units

A. CV2

B. C2/J

C. C/V

D. J/V2

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4

If three 9 mH inductors are connected in parallel without mutual inductance then the total i nductance is

A. 3 mH

B. 9 mH

C. 27mH

D. 18 mH

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4

An open resistor when checked with an ohmmeter reads

A. Zero

B. Infinite

C. High but within the tolerance

D. Low but not zero

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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