Description : When you are using an ohmmeter to test a transistor for leakage, what is indicated by a low, but not shorted, reverse resistance reading?
Last Answer : A leaking transistor
Last Answer : In a transistor leakage current mainly depends on temperature.
Description : In a reverse biased PN-junction, which current carriers cause leakage current?
Last Answer : The minority carriers
Description : Describe the leakage current in a transmission line and in what unit it is expressed.
Last Answer : The small amount of current that flows through the dielectric between two wires of a transmission line and is expressed in micro ohms per unit length.
Description : Which transistor configuration has a current gain of less than 1?
Last Answer : Common base.
Description : Name the two current loops in a transistor.
Last Answer : The base current loop and the collector current loop
Description : What are the majority current carriers in a PNP transistor?
Last Answer : Holes.
Description : What percentage of current in an NPN transistor reaches the collector?
Last Answer : 98 percent.
Description : What effect does flux leakage in a transformer have on the coefficient of coupling (K) in the transformer?
Last Answer : it causes K to be less than unity (I).
Description : What is "leakage flux?"
Last Answer : Lines of flux generated by one winding which do not link the other winding.
Description : In a sawtooth generator, why is the transistor turned on for a longer time than the discharge time of the RC network?
Last Answer : To allow the capacitor time to discharge.
Description : What are the factors that limit the frequency response of a transistor amplifier?
Last Answer : The capacitance and inductance of the circuit and the interelectrode capacitance of the transistor.
Description : When you are testing the gain of an audio-frequency transistor with an ohmmeter, what is indicated by a 10-to-1 resistance ratio?
Last Answer : Normal gain.
Description : What are two transistor tests that can be done with an ohmmeter?
Last Answer : Gain and junction resistance.
Description : How is the collector lead identified on an oval-shaped transistor?
Last Answer : By the wide space between the collector lead and the other two leads (emitter and base)
Description : What safety precaution must be taken before replacing a transistor?
Last Answer : The power must be removed from the circuit.
Description : Which transistor configuration has the highest input resistance?
Last Answer : Common collector.
Description : What method for checking transistors is cumbersome when more than one transistor is bad in a circuit?
Last Answer : The substitution method.
Description : What is the greatest danger to a transistor?
Last Answer : Heat.
Description : List three items of information normally included in the general description section of a specification sheet for a transistor.
Last Answer : The kind of transistor, the transistor's common applications, and mechanical data
Description : In the basic transistor amplifier discussed earlier, what is the relationship between the polarity of the input and output signals?
Last Answer : The signals are opposite in polarity or 180 degrees out of phase with each other.
Description : What is the relationship between the polarity of the voltage applied to the PNP transistor and that applied to the NPN transistor?
Last Answer : The polarity of voltage applied to the PNP transistor is opposite of that applied to the NPN
Description : In the NPN transistor, what section is made very thin compared with the other two sections?
Last Answer : The P or base section.
Description : Which transistor configuration provides a phase reversal between the input and output signals?
Last Answer : Common emitter.
Description : What are the three transistor configurations?
Last Answer : Common emitter (CE), common base (CB), and common collector (CC)
Description : To properly bias an NPN transistor, what polarity voltage is applied to the collector, and what is its relationship to the base voltage?
Last Answer : Positive, more positive.
Description : What is one of the most important parts of any transistor manufacturing process?
Last Answer : Quality control.
Description : What was the name of the very first transistor?
Last Answer : Point-contact.
Description : In which direction does the arrow point on an NPN transistor?
Last Answer : Outward.
Description : What electronic function made the transistor famous?
Last Answer : Amplification.
Description : The base of a transistor serves a purpose similar to what element of the FET
Last Answer : Gate.
Description : What is one of the primary advantages of the FET when compared to the bipolar transistor?
Last Answer : High input impedance.
Description : What two transistor amplifier configurations are combined in the single-transistor, two-input, single-output difference amplifier?
Last Answer : Common emitter (CE) and common base (CB)
Description : Why is a high-gain transistor used in the phase-shift oscillator?
Last Answer : Because of the losses encountered in the RC networks.
Description : What are the three basic configurations of transistor oscillators?
Last Answer : Common collector (CC), common emitter (CE), and common base (CB).
Description : Which junction of the transistor in the common-emitter detector detects the modulation envelope?
Last Answer : Emitter-base junction
Description : What three functions does the transistor in a regenerative detector serve?
Last Answer : Oscillator, mixer, and detector.
Description : What simple, one-transistor detector circuit uses the heterodyne principle?
Last Answer : Regenerative detector.
Description : When you are using an ohmmeter to test a transistor, what range settings should be avoided?
Last Answer : Any range setting that produces a current flow through the transistor that exceeds 1 milliamp (usually R x 1 range)
Description : What is the major advantage of a transistor over a tube?
Last Answer : Rugged design.
Description : What characteristic of a transistor is varied in a semiconductor-reactance modulator?
Last Answer : Collector-to-emitter capacitance.
Description : What are the four classes of operation of a transistor amplifier?
Last Answer : A, AB, B, C.
Description : What happens as the sun ages it contain?
Last Answer : Need answer
Description : What happens to the permeability of an iron core as the current increases from the operating point to a large value?
Last Answer : Permeability decreases
Description : According to Ohm’s law, what happens to circuit current if circuit resistance (a) increases, (b) decreases?
Last Answer : (a) Current decreases (b) Current increases
Description : According to Ohm’s law, what happens to circuit current if the applied voltage (a) increases, (b) decreases?
Last Answer : (a) Current increases (b) Current decreases
Description : What happens to the path for current when S1 is open as shown in figure 3-2(A)?
Last Answer : The path for current is incomplete; or, there is no path for current with S1 open.
Description : If the amount of current in the conductor changes, what happens to the magnetic field around the conductor?
Last Answer : If the current increases the magnetic field increases; if the current decreases the magnetic field decreases.