Related Questions
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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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4
Which waveform in which the rms value and the mean value are equal?
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4
What is the complex impedance of a circuit with an absolute resistance of 300 ?
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Two complex numbers or phasors are said to be conjugate if they
A. Differ only in the algebraic sign of their quadratic components
B. Differ only in the algebraic sign of their real components
C. Are equal in their real and quadrature components including alge
D. Are equal in their real components but differ in their quadrature components i ncluding algebraic signs.
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4
When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its reactance of frequency 2f is
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4
If the capacitance of mica capacitor is 5 times the capacitcitora then the relative permittivity of mica is
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4
Electric energy refers to
A. Volt divided by coulomb
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For a carbon composition resistora typical resistance values range from
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Which of the following dielectric materials makes the lowest-capacitance capacitor?
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Resistor with colored bands in the body
B. Carbon-composition resistor
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Which of the following represents the energy stored in a cap
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How many degrees of phase represents one full cycle?
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4
In an ac circuit with inductive reactance ?, the
A. Phase angle of the circuit is always 45�
B. Voltage across the inductance must be 90� out o f-phase witht he applied voltage
C. Current through the inductance lags its induced voltage by 90�
D. Current through the inductance and voltage across it are180� outof-phase
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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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If a coil has a Q of 10a it means that
A. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance
B. The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil
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4
A 5 F capacitor charge to 5V has a stored charge equal to
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In a rectangular wavea the form factor is
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What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?
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A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
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What is the hot resistance of a 100 Wa 220 V incandescent lamp?
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What dielectric is generally employed by a variable capacitor?
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Another term for superconductor.
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A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20a000 ohms?
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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 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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If three 100-pF capacitors are connected in seriesa then the total capacitance is
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For a series ACcircuita ___ is not used as a reference phasor.
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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 multiple capacitora the plate area is
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Which of the following is a common material used in wire-wound resistors?