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What is the correct answer?

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

Correct Answer :

A. 0.125 F


Related Questions

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What refers to the lowest voltage across any insulator that can cause current flow?

A. Conduction voltage

B. Critical voltage

C. Breakdown voltage

D. Voltage capacity

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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

VL= VCin a series RLCcircuit when

A. The value of the impedance is minimum

B. The power factor is zero

C. The current leads the total voltage by 90�

D. The total voltage is zero

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An inductance of 1 mH is

A. 0.001 H

B. 0.01 H

C. 0.0001 H

D. 0.10 H

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Which of the following is a common material used in wire-wound resistors?

A. Manganin

B. Carbon

C. Bronze

D. German silver wire

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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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In an ac circuit with XL and R in seriesa the

A. Voltages across R and XL are in phase

B. Voltage across R lags the voltage across XLby 90°

C. Voltages across R and XL are 180° outof-phase

D. Voltage across R leads the voltage across XLby 90°

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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

Permeability is otherwise known as

A. Magnetic conductivity

B. Magnetic susceptibility

C. Electric conductivity

D. Electric susceptibility

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Series resonant circuit is sometimes known as

A. Rejector circuit

B. Acceptor circuit

C. Inductive circuit

D. Capacitive circuit

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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

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4

The unit of elastance is

A. Farad

B. Daraf

C. Siemen

D. Henry

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If a coil has a Q of 10a it means that

A. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance

B. The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil

C. It is a low Q coil

D. It is a high Q coil

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4

What is the time constant for L of 240 mH in series with R of 20 ?

A. 12 ms

B. 4.8 s

C. 83.3 s

D. 12 s

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The ratio of maximum value to the effective value of an alternating quantity is called

A. Form factor

B. Peak factor

C. Dynamic factor

D. Leakage factor

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What is considered as the most important value of a sine wave?

A. Effective value

B. Peak value

C. Average value

D. Instantaneous value

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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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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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Parallel resonant circuit is sometimes called as

A. Acceptor circuit

B. Rejector circuit

C. Inductive circuit

D. Capacitive circuit

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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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It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.

A. Infinite

B. Zero

C. Low

D. High

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The Q-factor of a series resonant circuit is also known as

A. Current magnification factor

B. Voltage magnification factor

C. Load factor

D. Leakage factor

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The rms value of a triangular or sawtooth waveform is ___ tim value.

A.

B.

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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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A neon glow lamp used as a night light ionizes at approximately

A. 70 V

B. 80 V

C. 90 V

D. 100 V

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Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is

A. Positive

B. Negative

C. Zero

D. Infinite

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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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Metal tin becomes superconductor at approximately

A. 6 K

B. 3.7 K

C. 5 K

D. 4.7K

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Transient period is considered over after

A.

B.

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What is the most common non-sinusoidal waveform?

A. Square wave

B. Triangular wave

C. Trapezoidal wave

D. Sawtooth wave