True (t) or False (f) Questions: (10) 1. The total capacitance of several capaci
ID: 1829743 • Letter: T
Question
True (t) or False (f)Questions: (10)
1. The total capacitance of several capacitors connected in seriesequals the sum of the individual capacitances.
2. An ideal capacitor looks like an open circuit to dc current onceit has charged to its final value.
3. The angle associated with the total impedence is the angle bywhich the applied voltage leads the source current.
4. Inductive reactance is plotted on the negative imaginary axis onan impedance diagram.
5. Admittance is the reciprocal of impedance.
6. The susceptance of a given capacitor decreases as frequencyincreases.
7. Impedance is the combination of capacitive reactance, inductivereactance, and dc resistance.
8. The coefficient of coupling between two coils can never begreater than one.
9. A step-down transformer is one in which the primary voltage issmaller than the secondary voltage.
10. Transformation ratio is the ratio of the primary to thesecondary turns in a transformer.
Explanation / Answer
the COEFFICIENT OF COUPLING between two coils isequal to the ratio of the flux cutting one coil to the fluxoriginated in the other coil. If the two coils are so positionedwith respect to each other so that all of the flux of one coil cutsall of the turns of the other, the coils are said to have a unitycoefficient of coupling. It is never exactly equal to unity (1),but it approaches this value in certain types of coupling devices.If all of the flux produced by one coil cuts only half the turns ofthe other coil, the coefficient of coupling is 0.5. The coefficientof coupling is designated by the letter K.
The mutual inductance between two coils,L1 and L2, is expressed in terms of theinductance of each coil and the coefficient of coupling K. As aformula:
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