Related Questions
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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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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 capacitive load always has a ______ power facto
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The impedance in the study of electronics is represented by resistan
C. Inductance and capacitance
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4
For parallel 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
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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When the temperature of copper wire is increased its resistance is
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A term used to express the amount of electrical energy stored in electrostatic field.
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What is the conductance of a circuit having three 10 resistors in parallel?
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Which of the following is the statement of Ohm�s law?
A. Electric current is directly proportional to both voltage and resistance
B. Electric current varies directly as the voltage and inversely as the resistance
C. Electrical power is directly proportional to the resistance and inversely as the current squared
D. Electrical power is directly proportional to both voltage squared and the resistance
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Which of the following describes the action of a capacitor?
A. Stores electrical energy
B. Opposes changes in current flow
C. Creates a dc resistance
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The farad is not equivalent to which of the following combination of units
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Points to be considered in choosing a capacitor
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Resistor with colored bands in the body
B. Carbon-composition resistor
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The current is ____ times the maximum current at half-power points of a resonance curve.
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The potential gradient in a cable is maximum in
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A rheostat is a form of
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Which of the following is a disadvantage of a wire-wound resistor?
A. It has reactance in radio-frequency circuits
B. It cannot handle much power
C. It draws a large amount of current
D. It cannot handle high voltage
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4
The reason why electrical appliances are connected in parallel.
A. It is a simple circuit
B. This makes the operation of appliances independent with each other
C. This results in reduced power consumption
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The area of capacitor plates increases two timesa then its capacitance
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Norton�s theorem is ____ Thevenin�s theorem.
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For a parallel ACcircuita ___ is used as a reference phasor.
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The voltage cannot be exactly in phase with the current in a circuit that contains
C. Inductance and capacitance
D. Inductancea capacitance and resistance
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If two resistances of 9 and 6 are connected in parallela the total resistance is
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What is the efficiency under the conditions of maximum power transfer?
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A capacitor of 0.5 F charged to 220 V is connected across an uncharged 0.5 F capacitor. What is the voltage across each capacitor?
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In dividing or multiplying phasor quantitiesa ___ form is used.
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In a pure capacitancea
A. Current leads voltage by 90�
B. Current leads voltage by 180�
C. Current lags voltage by 90�
D. Current lags voltage by 180�
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4
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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What is the time constant for L of 240 mH in series with R of 20 ?