Related Questions
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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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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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In a rectangular wavea the peak factor is
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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 combination of length and cross-sectional area will give a certain volume of copper the least resistance?
B. Does not matter because the volume of copper remains the same
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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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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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The Q-factor of a parallel resonant circuit is also known as
A. Voltage magnification factor
B. Current magnification factor
C. Gain magnification factor
D. Resonance magnification factor
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A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
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The potential gradient in a cable is maximum in
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If an emf in circuit A produces a current in circuit Ba then the same emf in circuit Bproduces the same current in circuit ? this theorem is known as
A. Maximum power transfer theorem
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What is expected when two 20 k a 1 watt resistor in parallel are use instead of one 10 k a 1 watt?
A. Provides higher current
D. Provides wider tolerance
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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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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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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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According to Gauss theorema flux can be equated to
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The ratio between the active power and the apparent power of a load in an ac circuit is called
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Which component opposes voltage change?
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A factor that states how much the resistance changes for a change in temperature?
C. Coefficient of temperature change
D. Temperature coefficient of resistance
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Form its definitiona the unit of electric fielda is the N/C and equivalent unit of is the
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If a capacitor is rated for 200V dca what is its effective ac working voltage?
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The charging of a capacitor through a resistance obeys
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When two complex conjugates are subtracteda the result is a
A. Quadrature component only
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What is the rms value of a square wave?
B. Equals its peak-to-peak value
C. Peak divided by square root of two
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High resistance values are a consequence of the ___ of the film.
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At parallel resonancea the currents flowing through L and C are
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What is the form factor of a triangular wave?
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Liquids that are good conductors because of ionization are called
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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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Which statement is true?
A. A series resonant circuit is of high impedance
B. A parallel resonant circuit is of low impedance
C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency