Description : What type of feedback is usually caused by interelectrode capacitance?
Last Answer : Negative (degenerative) feedback
Description : Moving tube electrodes apart to decrease interelectrode capacitance causes an increase in the effect of what property?
Last Answer : Transit time
Description : What happens to the impedance of interelectrode capacitance as frequency increases?
Last Answer : Impedance decreases.
Description : How does the addition of a screen grid in a tetrode reduce interelectrode capacitance?
Last Answer : The interelectrode capacitance (cpg) is divided between two series capacitances; thus, cpg is greatly reduced.
Description : In the illustrated circuit, the amplifier is connected in what basic configuration? EL-0022 A. common base B. reverse bias, negative feedback C. common emitter D. common collector
Last Answer : Answer: C
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 : The collector-injection modulator is similar to what type of tube modulator?
Last Answer : Plate modulator.
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 is the output current in the common-collector circuit?
Last Answer : IE.
Description : What percentage of current in an NPN transistor reaches the collector?
Last Answer : 98 percent.
Description : What causes the change in collector current in an emitter injection modulator?
Last Answer : Gain is varied by changing the voltage on the emitter.
Description : What type of feedback aids an input signal?
Last Answer : Regenerative or positive
Description : A two-cavity klystron without a feedback path will operate as what type of circuit?
Last Answer : Amplifier.
Description : When an unknown capacitance is tested with a bridge, what is the value of Cx if R1 equals 70 ohms, R2 equals 150 ohms, and Cs equals 550 microfarads?
Last Answer : 256 microfarads.
Description : What effect does an increase in capacitance have on a capacitor’s opposition to current flow?
Last Answer : Opposition to current flow decreases.
Description : When the reverse bias on a varactor is increased, what happens to the effective capacitance?
Last Answer : Capacitance decreases.
Description : A transmission line is said to have distributed constants of inductance, capacitance, and resistance along the line. What units of measurement are used to express these constants?
Last Answer : Inductance is expressed in micro henrys per unit length, capacitance is expressed in picofarads per unit length, and resistance is expressed in ohms per unit length.
Description : . What are two of the three physical factors that determine the values of capacitance and inductance of a transmission line?
Last Answer : (1) Type of line used, (2) dielectric in the line, and (3) length of line.
Description : Trade-offs between competing effects are necessary for high speed response. Which competing effect (fast transit time, low capacitance, or high quantum efficiency) requires a thin active area?
Last Answer : Fast transit time.
Description : Should the capacitance of the photodetector be kept small or large to prevent the RC time constant from limiting the response time?
Last Answer : Small
Description : What happens to the value of XC as capacitance increases
Last Answer : XC decreases.
Description : Examine the three capacitors shown below. What is the capacitance of each?
Last Answer : a. 26µF or 260,00pF b. 630pF c. 9600pF
Description : State three factors that affect the capacitance of a capacitor.
Last Answer : a. The area of the plates. b. The distance between the plates. c. The dielectric constant of the material between the plates.
Description : Is the base region much thinner or much wider than the collector and the emitter regions?
Last Answer : yes its thinnerMost of the free electrons that have entered the base do notrecombine with holes because the base is very thin.
Description : The diagram shown in the illustartion represents a/an _____________. EL-0022 A. magnectic amplifier B. common base amplifier C. common collector amplifier D. common emitter amplifier
Last Answer : Answer: D
Description : In the illustrated circuit, the amplifier is connected in what basic configuration? EL-0045 A. common emitter B. common collector C. darlington paired, capacitor coupled D. common base
Description : In the illustration, the large battery and R(L) are in the circuit to ________. EL-0022 A. forward bias the emitter-base B. reverse bias the emitter-base C. forward bias the emitter/collector D. reverse bias the emitter/collector
Description : As shown in the illustration, which of the elements listed does the line 'B' represent in the basic schematic symbol of a PNP transistor? EL-0068 A. Base B. Emitter C. Cathode D. Collector
Description : The component labeled 'CR1' in the circuit shown in the illustration __________________. EL-0085 A. varies its anode/cathode polarity depending on 'RL' current B. rectifies the varying voltage from the ... reactance to smooth ripple D. establishes a constant reference voltage for the base of 'Q1'
Description : Which of the following actions can be carried out in order to prevent thermal runaway in a transistor? A. Increase the current through the collector-base junction. B. Install a heat sink. ... point to increase collector current. D. Increase the potential difference between the emitter and the base.
Last Answer : Answer: B
Description : The device in figure 'B' shown in the illustration will conduct when the ____________. EL-0067 A. base-emitter is forward biased and the collector-base is reverse biased B. anode-cathode is forward ... is reversed biased D. terminal 1-2 is forward biased and the emitter-terminal 1 is reverse biased
Description : The leads of the device in figure 'B' shown in the illustration are named _________. EL-0065 A. source, gate and drain B. emitter, base and collector C. emitter, base 1 and base 2 D. anode, cathode and gate
Last Answer : Answer: A
Description : Leads on the device in figure 'B' shown in the illustration are named ____________. EL-0067 A. source, gate and drain B. emitter, base and collector C. emitter, base 1 and base 2 D. anode, cathode and gate
Description : Which of the following statements correctly applies to transistors? A. NDN and PNP are the two basic types of transistors. B. The three terminals are called the emitter, base, and collector. C. The emitter separates the base and collector. D. The collector separates the emitter and base.
Description : The leads of the device in figure 'A' shown in the illustration are named the _______________. EL-0065 A. source, gate and drain B. emitter, base and collector C. emitter, base 1 and base 2 D. anode, cathode and gate
Description : You are performing an out-of-circuit test of the semi-conductor shown in the illustration. Using an ohmmeter on 'low power' position and with leads properly installed, which of the listed results would indicate a good ... lead on 'A' and red lead on 'C'; and a high reading with the leads reversed.
Description : Under ideal conditions, the collector current is (a) Equal to base current (b) Nearly equal to emitter current (c) Less than base current (d) always zero
Last Answer : (b) Nearly equal to emitter current
Description : A part of transistor which is heavily doped to produce large number of majority carriers is (a) Emitter (b) Base (c) Collector (d) any of above
Last Answer : (a) Emitter
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 : In the transistor schematic symbol, the arrow ________ (a) located on emitter (b) located on base (c) located on collector (d) points from north to south
Last Answer : a) located on emitter
Description : For normal operation of a transistor, the collector base junction is kept (a) Unbiased (b) forward biased (c) reverse biased (d) none
Last Answer : (c) reverse biased
Description : The operation of a transistor requires ______ (a) Emitter is heated (b) base is heated (c) collector be heated (d) none of above
Last Answer : (d) none of above
Description : In n-p-n transistor, p works as ________ (a) Collector (b) emitter (c) base (d) any of above
Last Answer : c) base
Description : The central region of transistor is called (a) Base (b) emitter (c) collector (d) neutral
Last Answer : (b) emitter
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 : What are the three elements of a bipolar transistor? Are they the: w) grid, plate, cathode x) suppressor, deflector, target y) energizer, controller, terminus z) emitter, base, collector
Last Answer : ANSWER: Z -- EMITTER, BASE, COLLECTOR
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 : A transistor has a typical value of β = 200 , If the collector current is 15 mA, then base current will be
Last Answer : A transistor has a typical value of β = 200 , If the collector current is 15 mA, then base current will be 0.075 mA
Description : For the active mode BJT operation (A) Emitter Base Junction is Forward Biased and Collector Base Junction is Forward Biased (B) Emitter Base Junction is Reverse Biased and Collector Base Junction ... Biased (D) Emitter Base Junction is Reverse Biased and Collector Base Junction is Forward Biased
Last Answer : For the active mode BJT operation Emitter Base Junction is Forward Biased and Collector Base Junction is Reverse Biased.