Related Questions
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Which of the following capacitors are used only in dc circuits?
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The ___ of an alternating quantity is defined as the fractional part of a period or cycle through which the quantity has advanced from selected origin.
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What is considered as the most important value of a sine wave?
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The presence of an electric current is made known by
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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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The factor 0.707for converting peak to rms applies only to
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The internal resistance of an ideal current source is
C. Equal to the load resistance
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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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For greater accuracya the value of phase angle should be determined from
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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?
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The curve between current and frequency is termed as
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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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Under the conditions of maximum power transfera a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?
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The symbol Q refers to
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If a capacitor is rated for 200V dca what is its effective ac working voltage?
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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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³Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR�. This states
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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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What dielectric is generally employed by a variable capacitor?
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Another term for superconductor.
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Which statement is true about a passive circuit?
A. A circuit with neither a source of current nor a source of potential difference
B. A circuit with a voltage source
C. A circuit with a current source
D. A circuit with only resistance as a load
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An open inductor has
A. Zero resistance and infinite inductance
B. Infinite resistance and zero inductance
C. Infinite resistance and infinite inductance
D. Zero resistance and zero inductance
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Which waveform in which the rms value and the mean value are equal?
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Inductive reactance applies only to sine waves because it
A. Increases with lower frequencies
B. Increases with lower inductance
C. Depends on the factor 2
D. Decreases with higher frequencies
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The farad is not equivalent to which of the following combination of units
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For a series circuita the higher the quality factor
A. The greater the bandwidth
B. The narrower the passband
C. The broader the resonance curve
D. The wider the passband
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A series RLCcircuit consists of a 10 resistor in series with L = 10 Ha and C= 100 F. Determine a new value of Ia for which the resonant frequency is one ±half the original value.
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Leakage resistance in a capacitor results into
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When two unequal values of resistors are connected in parallel across a dc sourcea greater current flows through the
C. Higher wattage resistance
D. Lower wattage resistance
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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