52701. What is the phase angle of a 24 Vac parallel RL circuit when R = 45 ohms and XL = 1100 ohms?
52702. A winding of wire can be called
52703. What happens when moving expanding lines of force encounter a conductor?
52704. Fixed transformers have:
52705. In a B-H curve, magnetizing force is equal to:
52706. Which of the following represents a true equivalent of an inductor?
52707. In a transformer, what will happen to the primary current if the secondary magnetic field increases?
52708. The time required for one weber of flux to cut a conductor and produce one volt is:
52709. What is the maximum source current for a transformer rated at 10 kVA, 1000/500 60 Hz?
52710. What is the total inductance assuming no mutual inductance?
52711. A voltage is induced in a transformer secondary winding by the action of the:
52712. What is electromagnetism?
52713. Counter emf or induced voltage is:
52714. What are the properties that determine the inductance of a coil?
52715. An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like
52716. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 k, and a 1 k resistor are in series with a source?
52717. When a load is not connected to the secondary of a transformer:
52718. The primary winding of a transformer is the side connected to the load.
52719. An air-core inductor has a metal core.
52720. The time constant of an inductive circuit is dependent on the circuit's resistance.
52721. The amount of dc current that an inductor will allow to pass depends on the circuit's total resistance that is in series with it.
52722. An inductor will boost current flow.
52723. A step-up transformer will have a turns ratio greater than 1.
52724. The secondary current in a transformer depends on the secondary voltage and load resistance values.
52725. Kirchhoff's voltage law does not apply to series RL circuits.
52726. Magnetic force is the force that produces a magnetic field.
52727. A magnet consisting of a coil of wire wound around a soft iron or steel core is called an electromagnet.
52728. An ideal inductor would not dissipate any energy.
52729. Five time constants are required for current in an inductor to reach a maximum value.
52730. The quality factor of an inductor is the ratio of inductive reactance to the winding resistance of the coil.
52731. In a dc circuit, the only conversion of energy to heat is in the inductance of the coil itself.
52732. Inductance is proportional to the cross-sectional area of a coil.
52733. XL = 2fL
52734. The primary and secondary are in phase.
52735. Lenz's law states that the current induced in a circuit due to a change in the magnetic field is so directed as to oppose the change in flux or to exert a mechanical force opposing the motion.
52736. The output of the secondary winding is 15 V.
52737. For inductions in series, LT = L1 + L2 + L3 +...
52738. Maximum power will transfer across a transformer when the primary impedance equals the secondary impedance.
52739. Increasing the inductance value in an ac inductive circuit will lower the circuit current.
52740. A magnetic field results whenever a current flows through a conductor.
52741. All the schematic symbols shown in the given figure are variable inductors.
52742. Self-inductance is the property that causes an electromotive force to be produced in a conductor.
52743. The total inductance in the given circuit is 0.6 mH.
52744. Inductors connected in series will increase the total inductance value.
52745. Inductors are not as versatile as capacitors.
52746. An ac generator will produce a constant waveform.
52747. The current through an inductor in a parallel RL circuit leads the current through the resistor.
52748. An RL filter could be a high-pass or a low-pass filter.
52749. Faraday's law states that the polarity of induced voltage in a coil is in opposition to the current change through that coil.
52750. A transformer can be designed to step up or step down dc voltage.