(Solved): please help 19. An electronic circuit has a 60mH inductor and a 30mH inductor connected in para ...

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19. An electronic circuit has a $60\mathrm{mH}$ inductor and a $30\mathrm{mH}$ inductor connected in parallel. What is the total inductance of the circuit? A. $75\mathrm{mH}$ B. $35\mathrm{mH}$ C. $20\mathrm{mH}$ D. $90\mathrm{mH}$ 20. Which of the following values is equal to one picofarad? A. $1\times 10^{-3}\mathrm{F}$ B. $1\times 10^{-12}\mathrm{F}$ C. $1\times 10^{-10}\mathrm{F}$ D. $1\times 10^{-6}\mathrm{F}$ 21. What is the total inductance of a circuit that contains two $10\mu \mathrm{H}$ inductors connected in parallel? A. $5\mu \mathrm{H}$ B. $15\mu \mathrm{H}$ C. $20\mu \mathrm{H}$ D. $8\mu \mathrm{H}$ 22. An RC circuit is in its fifth time constant. Which one of the following statements is correct? A. The voltage across the resistor is still increasing. B. The capacitor is fully charged. C. The resistor voltage is near maximum. D. The voltage across the capacitor is still decreasing. 23. What type of meter is used to directly find the capacitance value of an unknown capacitor or to check the condition of a known capacitor? A. Oscilloscope B. VOM meter C. Megohm meter D. LCR meter 24. What is the time constant of a $2\mathrm{mH}$ inductor and a $200\Omega$ resistor connected in series? A. $10\mathrm{msec}$ B. $1\mu \sec$ C. $1\mathrm{msec}$ D. $10\mu \sec$ 25. If an RC circuit is supplied with $20\mathrm{VDC}$ and the circuit is in its second time constant, how much voltage is present across the capacitor? A. $17.26\mathrm{V}$ B. $12.74\mathrm{V}$ C. $18.14\mathrm{V}$ D. $15.19\mathrm{V}$