Related Questions
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4
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
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When voltage is applied across a ceramic dielectric the electrostatic field p roduced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is
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4
What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?
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4
When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its reactance of frequency 2f is
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4
According to Gauss theorema flux can be equated to
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4
The reason why electrical appliances are not connected in series.
A. Greater electrical power saving
C. Appliances have different current ratings
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4
In a rectangular wavea the form factor is
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4
In the 5-band method of capacitor color codinga the first band indicates
A. Temperature coefficient
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The temperature coefficient of resistance of electrolytes is
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It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
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In a complex resistance-reactance planea XLis represented
A. By an axis opposite the R axis
B. By an axis perpendicular to the XC axis
C. By an axis opposite the XCaxis
D. By an axis parallel to the R axis
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4
The potential gradient in a cable is maximum in
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Series resonant circuit is sometimes known as
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What can be used to estimate resonant frequency and to find reactance at any frequency for any value of capacitor or inductor?
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What is the time constant for L of 240 mH in series with R of 20 ?
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4
Points to be considered in choosing a capacitor
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How many degrees of phase represents one full cycle?
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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
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
What refers to the lowest voltage across any insulator that can cause current flow?
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4
The ohmic value of a resistor with negative temperature coefficient
A. Increases with increasing temperature
B. Increase with decreasing temperature
C. Stays unchanged with temperature change
D. Stays unaffected even with increasing temperature
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4
Which of the following dielectric materials makes the highest-capacitance capacitor?
B. Barium-strontium titanite
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4
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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4
What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?
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If voltage across the plates of 2 F capacitor is increased by 4 Va then charge on the plates will
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Which of the following represents the energy stored in a cap
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What value of R is needed with a 0.05 F Cfor an RCtime constant of 0.02 s?
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4
What is the total effective capacitance of two 0.25 F capacitors connected in series?
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4
What is the specific resistance of a pure silicon?
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What theorem is generally used in the analysis of vacuum tubes?