Related Questions
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4
In an ac circuit with XL and R in seriesa the
A. Voltages across R and XL are in phase
B. Voltage across R lags the voltage across XLby 90°
C. Voltages across R and XL are 180° outof-phase
D. Voltage across R leads the voltage across XLby 90°
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4
In a circuita a passive element is one which
C. Both supplies and receives energy
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4
A capacitor of 0.5 F charged to 220 V is connected across an uncharged 0.5 F capacitor. What is the voltage across each capacitor?
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4
Conventional flow assumes charges flow from
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4
At what frequency will an inductor of 5mH have the same reactance as a capacitor of 0.1 F?
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4
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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4
In a rectangular wavea the peak factor is
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4
The arc across a switch when it open an RL circuit is a result of the
A. Large self-induced voltage across L
C. Low resistance of the open switch
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4
In adding or subtracting phasor quantitiesa ___ form is the most convenient.
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4
Which of the following capacitors are used only in dc circuits?
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A circuit whose parameters change with voltage or current.
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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
In a circuita an active element is one which
C. Both supplies and receives energy
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4
For greater accuracya the value of phase angle should be determined from
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4
If a multiplate capacitor has 10 platesa each of area 10 cm2a then
A. 10 capacitors will be in parallel
B. 10 capacitors will be in series
C. 9 capacitors will be in parallel
D. 9 capacitors will be in series
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4
The wavelength of an alternating waveform depends upon the ___ of the variation.
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4
In a series RLCcircuit
A. Increasing the frequency decreases the resistance
B. Increasing the frequency increases the resistance
C. Both XLand XCchange as frequency changes
D. Impedance will always decrease
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4
In a rectangular wavea the form factor is
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4
How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?
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4
A capacitor is basically constructed of
A. Two conductors separated by a dielectric
B. Two dielectric separated by a conductor
C. Conductors and dielectric
D. Conductors and semiconductors
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4
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
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4
What is the most convenient way of achieving large capacitance?
A. By using multiplate construction
B. By using air as dielectric
C. By decreasing distance between plates
D. By using dielectric of low permittivity
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4
A rheostat is a form of
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4
The value of temperature coefficient ( ) is dependent upon
A. The nature of material and temperature
B. The length of material
C. The cross-sectional area of the material
D. The volume of the material
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4
In a resonant circuita if Q ? 10 resonant frequency _______ bandwidth.
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What is the complex impedance of a circuit with an absolute resistance of 300 ?
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4
High resistance values are a consequence of the ___ of the film.
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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
An impedance given by 90 -45� is a/an ___ impedance.
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A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C