Related Questions
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4
Which of the following is the statement of Ohm�s law?
A. Electric current is directly proportional to both voltage and resistance
B. Electric current varies directly as the voltage and inversely as the resistance
C. Electrical power is directly proportional to the resistance and inversely as the current squared
D. Electrical power is directly proportional to both voltage squared and the resistance
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4
For a series circuita the higher the quality factor
A. The greater the bandwidth
B. The narrower the passband
C. The broader the resonance curve
D. The wider the passband
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In a resonant circuita if Q ? 10 resonant frequency _______ bandwidth.
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If a capacitor is rated for 200V dca what is its effective ac working voltage?
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How many degrees of phase represents one full cycle?
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Which of the following has negative temperature coefficient?
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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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The charge in the capacitor is stored at the
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If an emf in circuit A produces a current in circuit Ba then the same emf in circuit Bproduces the same current in circuit ? this theorem is known as
A. Maximum power transfer theorem
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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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The farad is not equivalent to which of the following combination of units
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Which of the following is also known as antiresonant circuit?
A. Parallel resonant circuit
B. Series resonant circuit
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In an RL series circuita
A. Current lags voltage by less than 90�
B. Current lags voltage by 180�
C. Current lags voltage by 90�
D. Current leads voltage by 90�
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If the output resistance of a voltage source is 4 a it internal resistance should be
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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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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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What is the specific resistance of a pure silicon?
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What dielectric is generally employed by a variable capacitor?
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Which of the following capacitors has the highest cost per F?
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A three-by-threea series-parallel matrix of resistorsa all having the same ohmic valuea would have a net resistance of
A. One-third the value of a single resistor
B. Three times the value of a single resistor
C. The same value as a single resistor
D. Nine times the value of a single resistor
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Another term of the quality factor of the resonant circuit.
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Property of an electric circuit that dissipates electric energy
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What is expected when two 20 k a 1 watt resistor in parallel are use instead of one 10 k a 1 watt?
A. Provides higher current
D. Provides wider tolerance
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A capacitor is used to
D. Short the voltage source
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The reason why electrical appliances are connected in parallel.
A. It is a simple circuit
B. This makes the operation of appliances independent with each other
C. This results in reduced power consumption
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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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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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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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Which of the following is a disadvantage of a wire-wound resistor?
A. It has reactance in radio-frequency circuits
B. It cannot handle much power
C. It draws a large amount of current
D. It cannot handle high voltage
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A series RLCcircuit consists of a 10 resistor in series with L = 10 Ha and C= 100 F. Determine a new value of Ia for which the resonant frequency is one ±half the original value.