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4

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

Correct Answer :

C. Zero signal


Related Questions

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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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If one resistance in a series connection is opena then

A. The current is zero in all the other resistances

B. The current is maximum in all the other resistances

C. The voltage is zero across the open resistance

D. The voltage is infinite across the open resistance

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4

What does a capacitor store?

A. Voltage

B. Charge

C. Current

D. Power

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The electric field strength between capacitor plates has a unit

A. Volts per meter

B. Volts per mil

C. Amperes per meter

D. Amperes per mil

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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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In a series RLCcircuit

A. Increasing the frequency decreases the resistance

B. Increasing the frequency increases the resistance

C. Both XLand XCchange as frequency changes

D. Impedance will always decrease

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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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A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.

A. Half

B. Twice

C. One-fourth

D. Three times

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4

Two complex numbers or phasors are said to be conjugate if they

A. Differ only in the algebraic sign of their quadratic components

B. Differ only in the algebraic sign of their real components

C. Are equal in their real and quadrature components including alge

D. Are equal in their real components but differ in their quadrature components i ncluding algebraic signs.

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4

Voltage resonance means

A. Series resonance

B. Parallel resonance

C. Current magnification

D. Gain magnification

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If two resistances of 9 and 6 are connected in parallela the total resistance is

A.

B.

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Which of the following combination of length and cross-sectional area will give a certain volume of copper the least resistance?

A. 2L and1/2 A

B. Does not matter because the volume of copper remains the same

C. L and A

D. ½ L and 2 A

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4

If a multiplate capacitor has 10 platesa each of area 10 cm2a then

A. 10 capacitors will be in parallel

B. 10 capacitors will be in series

C. 9 capacitors will be in parallel

D. 9 capacitors will be in series

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

A. Voltage

B. Impedance

C. Current

D. Conductance

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The presence of an electric current is made known by

A. Electric shock

B. Effects produced

C. Magnetic shock

D. Flashing

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Loop currents should be assumed to flow in which direction

A. Straight

B. Clockwise

C. Counter-clockwise

D. Either B or C arbitrarily selected

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The symbol Q refers to

A. Resonance quotient

B. Quality factor

C. Power quotient

D. Qualification test

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What rating of a resistor determines its ability to absorb heat?

A. Wattage

B. Ohmic

C. Current

D. Voltage

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What dielectric is generally employed by a variable capacitor?

A. Mica

B. Air

C. Electrolyte

D. Ceramic

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In a pure capacitancea

A. Current leads voltage by 90�

B. Current leads voltage by 180�

C. Current lags voltage by 90�

D. Current lags voltage by 180�

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What is the complex impedance of a circuit with an absolute resistance of 300 ?

A. 0 + j 300

B. 300 + j 90

C. 0 ± j 300

D. 300 +j 0

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If resonant frequency is 10 kHz and quality factor is 50a then

A. Bandwidth is 200 Hz

B. XL= is 50a000

C. R is 50

D. XC= is 50a000

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4

What increases the resistance of wire at high frequencies?

A. Temperature

B. Voltage

C. Skin effect

D. Insulation

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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 rectangular wavea the form factor is

A.

B.

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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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4

The second strip of an electronic resistor color-code represents

A. The multiplier

B. The second digit of the value

C. The temperature

D. The tolerance

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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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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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For series capacitorsa total charge is

A. The sum of individual charges

B. Equal to the charge of either capacitors

C. Equal to the product of the charges

D. The quotient of the charges