CSE :: Electronic Principles
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Which one of the following statements is true for the voltages in a series RL circuit?
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The core of an electromagnet is said to be in saturation when:
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As the temperature increases, the current gain
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Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?
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Doubling the diameter of the coil in an inductor:
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Which one of the following statements is true for the impedance of a series RC circuit?
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If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point
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What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?
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What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?
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Which one of the following is a statement of KirchhofFs voltage law?
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A.
The total voltages is equal to the sum of the voltages across the resistance and inductance
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B.
The voltage always has the same amplitude and phase for every part of the circuit
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C.
The total voltage is less than the sum of the voltages across the resistance and inductance
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D.
The total voltage lags the total current by less than 90
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E.
None of the above
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A.
the core is permitted to move freely within the coil
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B.
an increase in current through the coil causes no further increase in the mmf
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C.
frequent changes in the direction of current through the coil causes heating effects in the core material
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D.
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
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E.
None of the above
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A.
The impedance is greater than the sum of the resistance and capacitive reactance
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B.
The impedance is equal to the sum of the resistance and capacitive reactance
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C.
The impedance is greater than either the resistance or capacitive reactance but less than their sum
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D.
The impedance is less than the sum of the resistance and capacitive reactance
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E.
None of the above
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A.
The total voltage in a parallel circuit is less than the value of the smallest voltage
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B.
The algebraic sum of voltages in a loop is equal to zero
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C.
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
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D.
The algebraic sum of voltages entering and leaving a point is equal to zero
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E.
None of the above
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