Related Questions
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4
Which of the following dielectric materials makes the lowest-capacitance capacitor?
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4
The superposition theorem is used when the circuit contains
C. Number of voltage sources
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4
The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %a it is necessary to add ___ to the circuit.
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A series RLCcircuit consists of a 10 resistor in series with L = 10 Ha and C= 100 F. Determine a new value of Ia for which the resonant frequency is one ±half the original value.
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4
What rating of a resistor determines its ability to absorb heat?
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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
What determines the direction of induced emf in a conductor or coil?
B. Fleming�s left hand rule
C. Ampere�s circuital law
D. Fleming�s right hand rule
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4
When two complex conjugates are subtracteda the result is a
A. Quadrature component only
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The presence of an electric current is made known by
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If resonant frequency is 10 kHz and quality factor is 50a then
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It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
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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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4
The impedance in the study of electronics is represented by resistan
C. Inductance and capacitance
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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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The ratio between the reactive power and the apparent power of an ac load is called
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Which of the following does not affect resistance?
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A capacitor requires 12 C of charge to raise its potential of 3 V. What is the capacitance of the capacitor?
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What theorem is usually used in the analysis of transistor circuit?
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The ___ of an alternating quantity is defined as the fractional part of a period or cycle through which the quantity has advanced from selected origin.
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Points to be considered in choosing a capacitor
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The capacitor opposes any change in voltage across it by
A. Passing a voltage proportional to the rate of change of current
B. Acting as a short circuit at time equal to zero
C. Passing a current proportional to the rate of change of voltage
D. Acting as a short circuit at time equal to infinity
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What is the complex impedance of a circuit with an absolute resistance of 300 ?
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When the power factor of a circuit is zeroa
A. Power absorbed is maximum
B. Power absorbed is minimum
C. Power absorbed is zero
D. The impedance is minimum
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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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A capacitor opposes change in
D. Neither voltage nor current
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At what frequency will the current in a series RLCcircuit reach its maximum value for an applied voltage of 15 V with R = 500 a L = 100 H and C= 0.001 F?
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If one resistance in a series connection is opena then
A. The current is zero in all the other resistances
B. The current is maximum in all the other resistances
C. The voltage is zero across the open resistance
D. The voltage is infinite across the open resistance
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The distance between the capacitor plates increases two timesa then its capacitance
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4
An electric circuit contains
C. Both active and passive elements
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The farad is not equivalent to which of the following combination of units