Related Questions
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An ac series circuit is composed of a resistance of 20 a inductive reactance of 40 a and a capacitive reactance of 15 . If a current of 1 ampere is flowinga what is the applied voltage
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If resonant frequency is 10 kHz and quality factor is 50a then
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What maximum voltage can be applied across the capacitor of time?
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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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The hot resistance of an incandescent lamp is about ___ times its cold resistance.
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What is the value of a carbon composition resistor with the following color code: Browna whitea orangea red
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A coil of inductance L has an inductive reactance of XLin an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is
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The symbol Q refers to
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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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What is the rms value of a square wave?
B. Equals its peak-to-peak value
C. Peak divided by square root of two
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In an ac circuit with a resistive branch and an inductive branch in parallela the
A. Voltage across the inductance leads the voltage across the resistance by 90°
B. Resistive branch current is 90° out of phase with the inductive branch current
C. Resistive and inductive branch currents have the same phase
D. Resistive and inductive branch currents are 180° outof-phase
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A trimmer is a variable capacitor in which capacitance is varied by changing the
C. Distance between plates
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Another term of the quality factor of the resonant circuit.
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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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What increases the resistance of wire at high frequencies?
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Which of the following is the most popular waveform?
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What is expected when two 20 k a 1 watt resistor in parallel are use instead of one 10 k a 1 watt?
A. Provides higher current
D. Provides wider tolerance
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Which of the following is also known as antiresonant circuit?
A. Parallel resonant circuit
B. Series resonant circuit
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What value of R is needed with a 0.05 F Cfor an RCtime constant of 0.02 s?
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The curve between current and frequency is termed as
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A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
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If the output resistance of a voltage source is 4 a it internal resistance should be
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Which of the following is a way of decreasing mutual inductance?
A. Moving the coils closer
B. Moving the coils apart
C. Decreasing the number of turns of either coil
D. Increasing the number of turns of either coil
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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
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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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The potential gradient in a cable is maximum in
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When frequency of an ac wave decreasesa the value of XLin a coil
B. Gets larger positively
C. Gets larger negatively
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What is the total effective capacitance of two 0.25 F capacitors connected in series?
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For a parallel ACcircuita ___ is used as a reference phasor.
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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