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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.

Correct Answer :

C.


Related Questions

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How many degrees of phase represents one full cycle?

A.

B.

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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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Which of the following represents the energy stored in a cap

A. CV2/2

B. 2Q2/C

C. C2/V

D. CV

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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

What is the reciprocal of quality factor?

A. Power factor

B. Reactive factor

C. Dissipation factor

D. 1/Q factor

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Which of the following has negative temperature coefficient?

A. Carbon

B. Nickel

C. Brass

D. Constantan

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A gang capacitor is a variable capacitor in which capacitance is varied by changing the

A. Dielectric

B. Number of plates

C. Plate area

D. Distance between plates

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Thevenin�s theorem is what form of an equivalent circuit?

A. Current

B. Voltage

C. Both current and voltage

D. Neither current nor voltage

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When the movable plates of a gang capacitor completely overlap the fixed platesa the capacitance of the capacitor is

A. Halfway between maximum and minimum

B. Maximum

C. Minimum

D. Zero

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In calculating maximum instantaneous power ___ voltage or current is used.

A. Peak

B. Average

C. Rms

D. Instantaneous

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A capacitor of 0.5 F charged to 220 V is connected across an uncharged 0.5 F capacitor. What is the voltage across each capacitor?

A. 220 V

B. 150 V

C. 110 V

D. 22 V

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What is the total effective capacitance of two 0.25 F capacitors connected in series?

A. 0.125 F

B. 1.25 F

C. 0.50 F

D. 2.5 if

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The reactance curve is a plot of frequency versus _____ for a series RLCcircuit

A. Current

B. Voltage

C. Gain

D. Impedance

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An inductive load always has a ___ power factor

A. Leading

B. Lagging

C. Zero

D. Unity

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Effects of capacitance

A. It opposes any change in the amount of voltage

B. Voltage is lagged behind the current by a quarter cycle

C. Electric energy is stored in the capacitor in the form of electrostatic field

D. All of the above

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A capacitance of 6 ��F means

A. 6 pF

B. 6 nF

C. 6 fF

D. 6 aF

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Electron flow assumes charges flow from

A. Negative to positive

B. Negative to negative

C. Positive to negative

D. Positive to positive

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Which of the following materials has the lowest dielectric strength?

A. Glass

B. Paper

C. Mica

D. Teflon

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Transient period is considered over after

A.

B.

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And ideal current source has an internal conductance of _____ siem

A. Infinite

B. One

C. Zero

D. One million

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Which of the following is a preferred resistor value?

A.

B.

C. 43a000

D. 54a321

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When two coils of identical reactance are in parallel without mutual inductancea the reactance of the combination is ___ the reactance of each coil.

A. One half

B. Twice

C. Four times

D. One fourth

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4

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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Which of the following is the peakiest?

A. Square wave

B. Sinusoidal wave

C. Triangular wave

D. Rectangular wave

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Which of the following is also known as antiresonant circuit?

A. Parallel resonant circuit

B. Series resonant circuit

C. Tuned circuit

D. Tank circuit

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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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4

The voltage cannot be exactly in phase with the current in a circuit that contains

A. Only capacitance

B. Only resistance

C. Inductance and capacitance

D. Inductancea capacitance and resistance

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4

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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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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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