Related Questions
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4
At parallel resonancea the currents flowing through L and C are
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4
Which of the following capacitors are used only in dc circuits?
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4
The reason why alternating current can induce voltage is
A. It has high peak value
B. It has a stronger magnetic field than direct current
C. It has a constant magnetic field
D. It has a varying magnetic field
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4
If two resistances of 9 and 6 are connected in parallela the total resistance is
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4
For a carbon composition resistora typical resistance values range from
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4
What is the other name of relative permittivity?
D. Specific inductance capacity
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4
What dielectric is generally employed by a variable capacitor?
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4
A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.
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4
Two complex numbers or phasors are said to be conjugate if they
A. Differ only in the algebraic sign of their quadratic components
B. Differ only in the algebraic sign of their real components
C. Are equal in their real and quadrature components including alge
D. Are equal in their real components but differ in their quadrature components i ncluding algebraic signs.
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4
A three-by-threea series-parallel matrix of resistorsa all having the same ohmic valuea would have a net resistance of
A. One-third the value of a single resistor
B. Three times the value of a single resistor
C. The same value as a single resistor
D. Nine times the value of a single resistor
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4
When the temperature of copper wire is increased its resistance is
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4
Which of the following does not generally affect the value of a capacitor?
A. The dielectric material used
B. The surface area of the plates
C. The thickness of the dielectric
D. The voltage applied to the plate
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4
The capacitance of a capacitor is ___ relative permittivity.
A. Directly proportional to
B. Inversely proportional to
D. Inversely proportional to the square of
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4
The charge in the capacitor is stored at the
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4
The ratio between the reactive power and the apparent power of an ac load is called
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4
For multi-plate capacitora capacitance is proportional to
A. Number of plates less one(n ± 1)
B. Number of plates plus one(n + 1)
C. Number of plates less two(n - 2)
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4
If the output resistance of a voltage source is 4 a it internal resistance should be
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4
What is the specific resistance of a pure germanium?
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4
Which is considered as the effect of a dielectric material?
A. Increasing capacitance
B. Decreasing capacitance
C. Reducing the working voltage
D. Increasing the distance between the plates
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4
Which of the following dielectric materials makes the lowest-capacitance capacitor?
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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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4
Another term for superconductor.
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What is a closed path made of several branches of the network called?
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4
The superposition theorem is used when the circuit contains
C. Number of voltage sources
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4
If a certain circuit has a current that is lagging the voltage by 45�a then it displays
A. Pure inductive reactance
B. Resistance and capacitance reactance
C. Resistance and inductive reactance
D. Pure capacitive reactance
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4
The internal resistance of an ideal current source is
C. Equal to the load resistance
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4
According to Gauss theorema flux can be equated to
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4
A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
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4
The resistance of an insulator ___ when its temperature is increased.
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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�