Related Questions
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4
A gang capacitor is a variable capacitor in which capacitance is varied by changing the
D. Distance between plates
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4
When two coils of identical reactance are in parallel without mutual inductancea the reactance of the combination is ___ the reactance of each coil.
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4
Voltage resonance means
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4
Which of the following elements is active?
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4
What is the most convenient way of achieving large capacitance?
A. By using multiplate construction
B. By using air as dielectric
C. By decreasing distance between plates
D. By using dielectric of low permittivity
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4
If two resistances of 9 and 6 are connected in parallela the total resistance is
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4
The capacitance of a capacitor is ___ relative permittivity.
A. Directly proportional to
B. Inversely proportional to
D. Inversely proportional to the square of
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4
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
Which statement is true?
A. A series resonant circuit is of high impedance
B. A parallel resonant circuit is of low impedance
C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
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4
In the 5-band method of capacitor color codinga the first band indicates
A. Temperature coefficient
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4
Which of the following is not a factor affecting capacitance oor?
C. Distance between plates
D. Dielectric material used
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4
What increases the resistance of wire at high frequencies?
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4
In an inductive coila the rate of rise of current is maximum
A. Near the final maximum value of current
B. At midvalue of current
D. After one time constant
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4
The average value of a triangular or sawtooth wave is _____ times its peak value.
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4
When the temperature of copper wire is increased its resistance is
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4
The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %a it is necessary to add ___ to the circuit.
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4
What value of R is needed with a 0.05 F Cfor an RCtime constant of 0.02 s?
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4
A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
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4
Rationalizing the denominator of a complex number means
A. Eliminating the j component in the denominator
B. Adding j component in the denominator
C. Eliminating the j component in the numerator
D. Adding j component in the numerator
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4
Which of the following capacitors are used only in dc circuits?
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4
The ratio of maximum value to the effective value of an alternating quantity is called
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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?
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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
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4
High resistance values are a consequence of the ___ of the film.
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4
The temperature coefficient of resistance of electrolytes is
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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.
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4
Two capacitors of capacitance 9 F and 18 F in series will have a total capacitance of
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4
Liquids that are good conductors because of ionization are called
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4
In a series RLCcircuit
A. The current lags VLby 90�
B. The current leads VLby 90�
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4
Kirchhoff�s laws (KCL and KVL) are applicable to
C. DC as well as AC circuits
D. Passive networks alone