Description : The area between base 1 and base 2 in a UJT acts as what type of common circuit component?
Last Answer : Variable resistor.
Description : To what circuit arrangement is a common-base detector equivalent?
Last Answer : A diode detector followed by a stage of audio amplification.
Description : Compare BJT common base configuration with common collector configuration on the basis of (i) Current gain (ii) Voltage gain (iii) Input impedance (iv) Output impedance
Last Answer : Parameter Common Base Common Collector Current gain Low (About 1) High (1+β) Voltage gain High 1 Input impedance Low High Output impedance High Low
Description : If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55
Last Answer : If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98
Description : If the output impedance of an amplifier circuit is decreased, what is the effect on the gain?
Last Answer : The gain decreases.
Description : If the unity-gain point of the operational amplifier used in question 24 is 500 kilohertz, what is the bandwidth of the circuit?
Last Answer : 50 kilohertz (Gain = 10; Gain-Bandwidth Product = 500,000) 500,000(Hz)
Description : What is the output current in the common-collector circuit?
Last Answer : IE.
Description : What is the input current in the common-emitter circuit?
Last Answer : Base current (IB).
Description : A common-emitter circuit has an input voltage of 0.1 volt, an output voltage of 2.0 volts, an input current of 0.5 milliamps, and an output current of 10 milliamps. What is the power gain? A. 20 B. 40 C. 400 D. 4000
Last Answer : Answer: C
Description : In the common–emitter transistor circuit, if the current gain is 100 and the collector current is 10 mA, the base current is: (1) 10 µA (2) 100 µA (3) 1 A (4) 10 A
Last Answer : In the common–emitter transistor circuit, if the current gain is 100 and the collector current is 10 mA, the base current is: 100 µA
Description : If current gain is required from an rf amplifier, what type of component should be used as an output coupling element?
Last Answer : A step-down transformer.
Description : Which transistor configuration has a current gain of less than 1?
Last Answer : Common base.
Description : The common-emitter transistor circuit can amplify a small current signal because a small change in the signal current produces one of the following. Does the change in signal produce a large change in the: w) emitter-base voltage x) base current y) collector current z) collector voltage
Last Answer : ANSWER: Y -- COLLECTOR CURRENT
Description : Which junction acts as the detector in a common-base detector?
Last Answer : Emitter-base junction.
Description : Common base configuration is little used because A) It has low input impedance B) It has high input impedance C) It does not heat up D) It has very high gain.
Last Answer : A) It has low input impedance
Description : The voltage gain of a common base amplifier depends on 1. Load resistor RL 2. input resistance of transistor 3. Ac alpha 4. All the above
Last Answer : The voltage gain of a common base amplifier depends on 1. Load resistor RL 2. input resistance of transistor 3. Ac alpha 4. All the above
Description : What is the letter designation for base current?
Last Answer : I B.
Description : Current gain of a transistor which has collector current of 10 mA and a base current of 40 micro Ampere is: (a) 25 (b) 250 (c) 2500 (d) 25000
Last Answer : b) 250
Description : What is the most common type of integrated circuit packaging found in military equipment?
Last Answer : DIPs (dual inline packages).
Description : What is the band of frequencies called that is included between the two points at which current falls to 70 percent of its maximum value in a resonant circuit?
Last Answer : Bandwidth of the circuit
Description : When is line current minimum in a parallel-LC circuit?
Last Answer : At the resonant frequency.
Description : In a parallel-resonant circuit, what is the relationship between impedance and current?
Last Answer : Maximum impedance, minimum current.
Description : In a series-RLC circuit, what is the condition of the circuit if there is high impedance, low current, and low reactance voltages
Last Answer : Nonresonant (circuit is either above or below resonance)
Description : . In an "ideal" resonant circuit, what is the relationship between impedance and current?
Last Answer : Impedance low Current high.
Description : As the tube filaments in the load heat up, will the circuit current increase or decrease?
Last Answer : Decrease.
Description : What is the relationship of current to voltage in a circuit?
Last Answer : current increases as voltage increases.
Description : If one branch of a parallel network is shorted, what portion of circuit current flows through the remaining branches?
Last Answer : None.
Description : What is the effect on total resistance and total current in a circuit if a short occurs in (a) a parallel branch, and (b) in a series portion?
Last Answer : (a) Total resistance decreases, total current increases (b) Total resistance decreases, total current increases
Description : What is the effect on total resistance and total current in a circuit if an open occurs in (a) a parallel branch, and (b) in a series portion?
Last Answer : (a) Total resistance increases, total current decreases (b) Total resistance becomes infinite, total current is equal to zero
Description : A series circuit consists of two resistors in series. R1 = 25 ohms and R2 = 30 ohms. The circuit current is 6 amps. What is the (a) source voltage, (b) voltage dropped by each resistor, (c) total power, and (d) power used by each resistor?
Last Answer : (a) 330 volts. (b) E1 = 150 volts. E2 = 180 volts. (c) 1.98 kilowatts. (d) P1 = 900 watts. P2 = 1.08 kilowatts component but in a parallel circuit total current divides among the available paths.
Description : There is a relationship between total current and current through the individual components in a circuit. What is this relationship in a series circuit and a parallel circuit?
Last Answer : The source voltage would have to be increased to 640 volts
Description : If the current was increased to 4 amps, what would be the voltage drop across each resistor in the circuit described in question 17?
Last Answer : E1 = 80 volts. E2 = 240 volts. E3 = 320 volts
Description : A series circuit consisting of three resistors has a current of 3 amps. If R1 = 20 ohms, R2= 60 ohms, and R 3 = 80 ohms, what is the (a) total resistance and (b) source voltage of the circuit?
Last Answer : (a) 160 ohms. (b) 480 ohms
Description : What is the power used in a circuit that has 10 amperes of current through a 10-ohm resistor?
Last Answer : 1 kilowatt.
Description : What is the current in a circuit with 5 ohms of resistance that uses 180 watts of power?
Last Answer : 6 amperes.
Description : How can the amount of current be changed in a circuit?
Last Answer : By changing the circuit resistance or the voltage of the power source.
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 : In what manner are current-measuring instruments connected to a circuit?
Last Answer : In series.
Description : What component of the D’Arsonval meter movement completes the circuit for current flow to the coil?
Last Answer : Hairspring.
Description : A disadvantage of using the configuration in the illustrated circuit is _________. EL-0045 A. no current gain B. high input resistance C. high voltage gain D. becomes unstable with an increase of ambient temperature
Last Answer : Answer: A
Description : The advantage of using the illustrated circuit configuration is _________. EL-0045 A. high input resistance B. high current gain C. the best stability with an increase in temperature D. the input and output are 180 degrees out of phase
Description : What two methods are used to compensate for the problems that cause low gain in an rf amplifier?
Last Answer : . RF transformers are used and the transistor is neutralized.
Description : If the input-signal-developing impedance of an amplifier is increased, what is the effect on the gain?
Last Answer : The gain increases.
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 happens to the overall gain of a lin-log amplifier as each stage saturates?
Last Answer : Decreases.
Description : How does ftc affect receiver gain, if at all?
Last Answer : FTC has no effect on receiver gain
Description : Immediately after the transmitter fires, stc reduces the receiver gain to what level?
Last Answer : Zero.
Description : Which of the two types of automatic gain control, agc or iagc, is most effective in radar use for the Navy?
Last Answer : IAGC.
Description : The power gain of an antenna is directly related to what other antenna property?
Last Answer : Directivity.