53951. If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is
53952. A transformer has
53953. If voltage is stepped-up to the secondary, current will be stepped-down by the same amount.
53954. In the given circuit, the secondary voltage is in phase with the primary voltage.
53955. The reflected load value that the source sees will always be larger than the load value itself.
53956. An open secondary winding of a transformer will cause the primary current to be nearly zero.
53957. The secondary voltages produced by a center-tapped transformer are equal in amplitude but 180° out of phase with respect to the center tap.
53958. A transformer that has 700 turns in the primary and 35 turns in the secondary has a turns ratio of 20:1.
53959. Regardless of whether the transformer is step-up or step-down, power in the primary equals the power in the secondary if there is 100% efficiency.
53960. In the given circuit, Maximum power is being transferred to the load.
53961. For mutual inductance to occur, the two coils must be at right angles to each other.
53962. If the current drawn in the secondary of a transformer increases, the power in the primary should remain the same.
53963. To ensure a high coefficient of coupling, all fixed transformers are usually wound on a(n) _____________.
53964. The reflected resistance is ___ as seen by the source in the given circu.
53965. The secondary current is _____ in the given circuit.
53966. Making the load resistance appear the same as the source's internal resistance is called _____.
53967. A transformer turns ratio of ________ will be needed to match an output impedance of 5 k to an 8 speaker.
53968. ___ occurs in a transformer when some of the primary flux lines pass through the air instead of the core.
53969. A step-up transformer will ___ to the secondary.
53970. The voltage V2 is _____ in the given circuit.
53971. ___ is the concept of one coil inducing a voltage into another coil.
53972. A(n) _____ transformer is usually used for audio or power applications.
53973. A(n) ___ is sometimes constructed as a variable transformer.
53974. When does maximum power transfer happen from the source to the load?
53975. A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 load. What is the efficiency of the transformer?
53976. The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?
53977. Increasing the number of turns of wire on the secondary of a transformer will
53978. What is the turns ratio of the transformer needed to match a 1 k source resistance to a 160 load?
53979. The signal voltage gain of an amplifier, Av, is defined as:
53980. In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid
53981. The depletion-mode MOSFET
53982. Three different points are shown on a dc load line. The upper point represents the
53983. Which of the following conditions are needed to properly bias an npn transistor amplifier?
53984. Often a common-collector will be the last stage before the load; the main function of this stage is to
53985. In order for feedback oscillators to have any practical value, the gain has to be
53986. To get a negative gate-source voltage in a self-biased JFET circuit, you must use a
53987. If the drain, source, and channel of a MOSFET are all a p-type material, and it operates in both modes, this is an n-channel D-MOSFET.
53988. A practical CE amplifier has the input on the base and the output taken off the emitter.
53989. The maximum peak-to-peak output voltage in the given circuit is 15 V.
53990. Base currents are usually small because of the physical construction of the thin and lightly doped base.
53991. The beta of a BJT is the ratio of collector current to emitter current.
53992. A certain amplifier has a voltage gain of 210. That gain expressed in decibels is 46.4 dB.
53993. Pearl fishing is done extensively in:
53994. A decrease in base current of a CE amplifier causes the voltage measured between the emitter and the collector to increase.
53995. In an n-type JFET, current will flow when a positive voltage is applied to the drain and a negative voltage is applied to the source.
53996. An essential requirement of a feedback oscillator is a phase shift around the feedback loop of 360°.
53997. The gate-source junction of a JFET must be ________ for proper linear operation.
53998. The ___ oscillator takes advantage of the piezoelectric effect.
53999. In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the product of Av × B equals_______.
54000. VCE approximately equals _______ when a transistor is in saturation.