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4

A capacitance of 6 ��F means

A. 6 pF

B. 6 nF

C. 6 fF

D. 6 aF

Correct Answer :

A. 6 pF


Related Questions

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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

Which of the following capacitors has the highest cost per F?

A. Plastic

B. Air

C. Mica

D. Electrolytic

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4

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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4

An alloy composed of 84 % coppera 12 % manganese and 4 % nickel.

A. Manganin

B. Constantan

C. Nichrome

D. German silver wire

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4

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

A linear circuit is one whose parameters

A. Change with change in voltage

B. Change with change in current

C. Do not change with voltage and current

D. Change with change in voltage and current

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4

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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4

A factor that states how much the resistance changes for a change in temperature?

A. Resistivity

B. Specific resistance

C. Coefficient of temperature change

D. Temperature coefficient of resistance

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4

A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in seriesa the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.

A. Child�s law

B. CR law

C. Coulomb�s law

D. Debye T3 law

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4

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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4

The hot resistance of an incandescent lamp is about ___ times its cold resistance.

A.

B.

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4

A capacitor is basically constructed of

A. Two conductors separated by a dielectric

B. Two dielectric separated by a conductor

C. Conductors and dielectric

D. Conductors and semiconductors

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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

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4

What is the specific resistance of a pure germanium?

A. 55 -cm

B. 55 -m

C. 55 -mm

D. 55 k -m

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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

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

For a parallel ACcircuita ___ is used as a reference phasor.

A. Voltage

B. Power

C. Current

D. Resistance

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4

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

At parallel resonancea the currents flowing through L and C are

A. Infinite

B. Zero

C. Unequal

D. Equal

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4

Which of the following has negative temperature coefficient?

A. Carbon

B. Nickel

C. Brass

D. Constantan

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4

The voltage lags the current by cycle in a

A. Purely resistive circuit

B. Purely inductive circuit

C. Purely capacitive circuit

D. Circuit containing resistancea capacitance and inductance

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4

Another term of the quality factor of the resonant circuit.

A. Figure of merit

B. Figure of demerit

C. Noise factor

D. Noise figure

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4

When frequency of an ac wave decreasesa the value of XLin a coil

A. Approaches zero

B. Gets larger positively

C. Gets larger negatively

D. Stays constant

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4

The symbol Q refers to

A. Resonance quotient

B. Quality factor

C. Power quotient

D. Qualification test

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4

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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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

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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

According to Gauss theorema flux can be equated to

A. Charge

B. Field intensity

C. Current

D. Voltage

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4

The reason why alternating current can induce voltage is

A. It has high peak value

B. It has a stronger magnetic field than direct current

C. It has a constant magnetic field

D. It has a varying magnetic field

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4

Property of an electric circuit that dissipates electric energy

A. Reactance

B. Impedance

C. Resistance

D. Conductance