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What is the most common non-sinusoidal waveform?
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The reciprocal of a complex number is
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A capacitor opposes change in
D. Neither voltage nor current
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The arc across a switch when it open an RL circuit is a result of the
A. Large self-induced voltage across L
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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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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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Loop currents should be assumed to flow in which direction
D. Either B or C arbitrarily selected
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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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Leakage resistance in a capacitor results into
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For a linear circuita ___ voltage or current is used to calculate average power.
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What refers to such work at very low temperaturesa near absolute zero?
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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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If the output resistance of a voltage source is 4 a it internal resistance should be
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The factor 0.707for converting peak to rms applies only to
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In a complex resistance-reactance planea XLis represented
A. By an axis opposite the R axis
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C. By an axis opposite the XCaxis
D. By an axis parallel to the R axis
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Which of the following conditions is not true for a series RLCcircuit at resonance?
C. The power factor is one
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For greater accuracya the value of phase angle should be determined from
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What is the specific resistance of a pure germanium?
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The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.
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Voltage resonance means
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When resistance are connected in parallela the total resistance is
A. Less than the smallest resistance in the connection
B. Greater than the smallest resistance in the connection
C. Between the smallest and greatest resistance in the connection
D. Increasing and decreasing depending upon the supply voltage
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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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What is the complex impedance of a circuit with an absolute resistance of 300 ?
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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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What is the total effective capacitance of two 0.25 F capacitors connected in series?
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If resonant frequency is 10 kHz and quality factor is 50a then
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What dielectric is generally employed by a variable capacitor?