Related Questions
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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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What is the most common non-sinusoidal waveform?
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The charging of a capacitor through a resistance follows what law?
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The reciprocal of a complex number is
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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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Form its definitiona the unit of electric fielda is the N/C and equivalent unit of is the
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A circuit whose parameters change with voltage or current.
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Which of the following is the peakiest?
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Refers to the outward-curving distortion of the lines of force near the edges of two parallel metal plates that form a capacitor.
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What increases the resistance of wire at high frequencies?
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A series-parallel combination of identical resistors will
A. Increase the power rating compared with one resistor alone
B. Increase the voltage rating compared with one resistor alone
C. Reduce the voltage rating compared with resistor alone
D. Result in an expensive circuit
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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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Effects of capacitance
A. It opposes any change in the amount of voltage
B. Voltage is lagged behind the current by a quarter cycle
C. Electric energy is stored in the capacitor in the form of electrostatic field
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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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An inductive load always has a ___ power factor
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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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What is the efficiency under the conditions of maximum power transfer?
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The electric field strength between capacitor plates has a unit
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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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4
What is the total resistance of a two equal valued resistors in series?
A. The difference of both
D. The sum of their reciprocals
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It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
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The voltage lags the current by cycle in a
A. Purely resistive circuit
B. Purely inductive circuit
C. Purely capacitive circuit
D. Circuit containing resistancea capacitance and inductance
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Of the equivalent combination of unitsa which one is not equal to watt?
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In calculating maximum instantaneous power ___ voltage or current is used.
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In a resonant circuita if Q ? 10 resonant frequency _______ bandwidth.
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Why are inductance and capacitance not relevant in a dc circuit?
A. Because it is a simple circuit
B. Because dc circuits require only resistance as load
C. Because they do not exist in a dc circuit
D. Because frequency of dc is zero
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Metal tin becomes superconductor at approximately
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Which waveform in which the rms value and the mean value are equal?
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Resistor with colored bands in the body
B. Carbon-composition resistor
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In a complex number 5 + j 10a 10 is called ___ part.