812905
Description
Flashcards by pete.c.diaz, updated more than 1 year ago
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Created by pete.c.diaz
over 10 years ago
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| Question | Answer |
| As current passes through a conductor: | a magnetic field is developed |
| When an electromagnet reaches maximum strength, it is considered to be: | at saturation |
| A rapidly reversing magnetic field causes heat dissipation know as: | Hysteresis loss |
| A conductor’s magnetic field causes heat dissipation know as: | current flowing through it |
| Electromagnetism induction is the generation of: | electricity from magnetism |
| An inductor is rated by a unit named: | Henry |
| What is one characteristic of an induction? | passes dc |
| Inductance is the ability of a coil to oppose: | current change |
| The formula to determine total inductance when inductors are connected in parallel is similar to: | Series capacitors |
| 10. Three parallel inductors of 84 mh, 96 mh, and 160 mh, will provide a total inductance of how many millihenrys? | 35 |
| Opposition to current flow without the dissipation of energy is called: | Inductive reactance |
| In an inductive circuit, reactance will: XL = 2^ f L | Increase with frequency |
| What is the phase angle in a purely inductive circuit? | 90 degrees |
| 14. What is the inductive reactance of a 1mH coil, when the applied frequency is 15 kHz? XL = 2^f L = 2^(15,000Hz)(.001H) = ? | 94.2 ohms |
| 15. What is the impedance of a 1 kHz series RL circuit, when R and XL are both 1000 ohms? Z = R2 + XL2 = (1000)2 + (1000)2 = ? | 1414 ohms |
| What is the total impedance of a series circuit, when the applied frequency is 455 KHz, and L=10 mH? XL = 2^ f L = 2^ (455,00)(.010) XL = 28.59 Kohm Zt = (15.)2 + (28.59)2 = ? | 32.2 K ohms |
| What is the true power of a 24 Vac parallel RL circuit, when R = 45 ohms, and XL = 1100 ohms? P true = (Vs)2 / R (24v)2 / 45ohm = ? | 12.8 watts |
| The circuit impedance for a 60 Vac single coil circuit that has a coil current of 4.47 amps is: V = I Z / Z = V 60v/4.47=? | 13.42 ohms |
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