Related Questions
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4
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
The open-circuit voltage at the terminal of load RL is 60V. Under the condition of maximum power transfera the load voltage will be
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4
Which of the following is not a factor affecting dielectric strength?
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4
A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in seriesa the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.
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4
What is the most common non-sinusoidal waveform?
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The mutual inductance between two coils is ___ the reluctance of magnetic path.
A. Directly proportional to
B. Inversely proportional to
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4
With double the number of turns by the same length and areaa the inductance is
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4
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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4
An alloy composed of 84 % coppera 12 % manganese and 4 % nickel.
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Which of the following is not a factor affecting capacitance oor?
C. Distance between plates
D. Dielectric material used
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4
The result of rust in electrical (wire) connection is
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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
Points to be considered in choosing a capacitor
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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
An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil
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4
The Q-factor of a series resonant circuit is also known as
A. Current magnification factor
B. Voltage magnification factor
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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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Which of the following capacitors has the highest cost per F?
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4
Which of the following is neither a basic physical law nor deliverable from one?
D. Kirchhoff�s second law
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4
In an ac circuit with a resistive branch and an inductive branch in parallela the
A. Voltage across the inductance leads the voltage across the resistance by 90°
B. Resistive branch current is 90° out of phase with the inductive branch current
C. Resistive and inductive branch currents have the same phase
D. Resistive and inductive branch currents are 180° outof-phase
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For a series ACcircuita ___ is not used as a reference phasor.
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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
If two equal resistances connected in series across a certain supply are now connected in parallel across the same supplya the power produced will be _____ that of series connection
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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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4
What is the conductance of a circuit having three 10 resistors in parallel?
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4
The voltage cannot be exactly in phase with the current in a circuit that contains
C. Inductance and capacitance
D. Inductancea capacitance and resistance
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4
What is the hot resistance of a 100 Wa 220 V incandescent lamp?
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Capacitance increase with
A. Larger plate area and less distance between plates
B. Larger plate area and greater distance between plates
C. Smaller plate area and less distance between plates
D. Higher values of applied voltage
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4
A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.
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Series resonance occurs when