Related Questions
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4
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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4
A 5 F capacitor charge to 5V has a stored charge equal to
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4
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
The symbol Q refers to
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The resistance of an insulator ___ when its temperature is increased.
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The farad is not equivalent to which of the following combination of units
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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 charge in the capacitor is stored at the
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What is the reciprocal of quality factor?
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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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An inductive circuit of resistance 16.5 and inductance of 0.14 H takes a current of 25 ?. if the frequency is 50 Hza find the supply voltage.
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Permeability is otherwise known as
B. Magnetic susceptibility
D. Electric susceptibility
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What is the efficiency under the conditions of maximum power transfer?
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Which of the following does not affect resistance?
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What rating of a resistor determines its ability to absorb heat?
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A term used to express the amount of electrical energy stored in electrostatic field.
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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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Which of the following is also known as antiresonant circuit?
A. Parallel resonant circuit
B. Series resonant circuit
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Which of the following elements is active?
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For maximum power transfera what is the relation between load resistance RL and internal resistance R of the voltage source?
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What is the specific resistance of a pure germanium?
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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
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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4
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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4
A neon glow lamp used as a night light ionizes at approximately
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Which of the following represents the energy stored in a cap
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4
What is the conductance of a circuit having three 10 resistors in parallel?
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4
In an RL series circuita
A. Current lags voltage by less than 90�
B. Current lags voltage by 180�
C. Current lags voltage by 90�
D. Current leads voltage by 90�
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4
Which of the following has a positive temperature coefficient?
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A rheostat is a form of