Related Questions
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Metal tin becomes superconductor at approximately
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What is the complex impedance of a circuit with an absolute resistance of 300 ?
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Which of the following dielectric materials makes the lowest-capacitance capacitor?
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4
When capacitors are connected in seriesa the total capacitance is
A. Smaller than the smallest capacitor
B. Smaller than the largest capacitor
C. Greater than any of the capacitor
D. Greater than the largest capacitor
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4
Which of the following conditions is not true for a series RLCcircuit at resonance?
C. The power factor is one
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What is the efficiency under the conditions of maximum power transfer?
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The superposition theorem is used when the circuit contains
C. Number of voltage sources
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What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?
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Which component opposes voltage change?
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An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil
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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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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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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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If the capacitance of mica capacitor is 5 times the capacitcitora then the relative permittivity of mica is
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When two pure sine waves of the same frequency and the same amplitude which are exactly 180� outof-phase are added togethera the result is
A. A wave with twice the amplitude
B. A wave with half the amplitude
D. A wave with twice the frequency
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A resistor wound with a wire doubled back on itself to reduce the inductance.
C. Anti-inductive resistor
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A trimmer is a variable capacitor in which capacitance is varied by changing the
C. Distance between plates
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Permeability is otherwise known as
B. Magnetic susceptibility
D. Electric susceptibility
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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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4
An open inductor has
A. Zero resistance and infinite inductance
B. Infinite resistance and zero inductance
C. Infinite resistance and infinite inductance
D. Zero resistance and zero inductance
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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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When the temperature of copper wire is increased its resistance is
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Which of the following does not affect resistance?
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Which of the following dielectric materials makes the highest-capacitance capacitor?
B. Barium-strontium titanite
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What is the value of a carbon composition resistor with the following color code: Browna whitea orangea red
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As applied to a series RLCcircuita bandwidth means
A. The frequency range for maximum power transfer
B. The difference between the highest and lowest frequencies of the oscillator
C. The separation of the half-power points
D. The frequency at which XL= XC
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In an ac wavea 30 degrees of phase is ___ of a cycle.
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A series RL circuit has R of 10 and XL of 5 a its impedance in rectangular form is given by
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Which of the following is a way of decreasing mutual inductance?
A. Moving the coils closer
B. Moving the coils apart
C. Decreasing the number of turns of either coil
D. Increasing the number of turns of either coil
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Points to be considered in choosing a capacitor