Description : What controls the contrast of a television cathode ray picture? A. AFC B. video stage gain C. Audio gain control D. CRT bias
Last Answer : B. video stage gain
Description : A high voltage applied to a gas discharge tube containing neon gas at very low pressure causes a current to flow through the tube. Which one of the following are the particles that flow towards the ... Are they w) electrons x) protons y) negatively charged neon ions z) positively charged neon ions
Last Answer : ANSWER: Z -- POSITIVELY CHARGED NEON IONS
Description : The device in figure 'B' shown in the illustration can be used to control an AC load yet maintain its high gain by ______________. EL-0091 A. connecting the load to the output side of the ... connecting the load to the input side of the bridge D. reversing the current flow through the bias winding
Last Answer : Answer: C
Description : What type of modulator is the cathode modulator (low- or high-level)?
Last Answer : Low-level.
Description : What type of bias (positive or negative) is added to a negative damper for the most positive extremity of the wave shape to be clamped above 0 volts?
Last Answer : Positive bias.
Description : What type damper (with bias) clamps the most negative extremity of the output waveform to a negative potential?
Last Answer : Positive clamper with negative bias.
Description : What type of bias is used where only moderate changes in ambient temperature are expected?
Last Answer : Self-bias.
Description : What type of bias is required for proper operation of a photodiode?
Last Answer : Reverse bias.
Description : What type of bias is required to cause an LED to produce light?
Last Answer : Forward bias.
Description : What type of bias makes a diode act as a closed switch?
Description : What type of bias opposes the PN junction barrier?
Last Answer : Forward.
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'
Last Answer : Answer: D
Description : It is an unidirectional device that blocks the current flow from cathode to anode (A) SCR (B) PCR (C) VCR (D) DCR
Last Answer : It is an unidirectional device that blocks the current flow from cathode to anode SCR
Description : The principle of professional behavior requires a CPA to a. Be straightforward and honest in performing professional services. b. Perform professional services with due care, competence and diligence. ... of the profession and refrain from any conduct which might bring discredit to the profession
Last Answer : Act in a manner consistent with the good reputation of the profession and refrain from any conduct which might bring discredit to the profession
Description : Cold-cathode tubes can be used as voltage regulators because of what characteristic?
Last Answer : They have the ability to maintain a constant voltage drop across the tube despite changes in current flow.
Description : What undesirable effect is caused by the inductance of the cathode lead?
Last Answer : Degenerative feedback.
Description : When a circuit uses cathode biasing, the input signal can cause varia
Last Answer : Through the use of a bypass capacitor
Description : Before a diode will conduct, the cathode must be what polarity relative
Last Answer : Negative.
Description : What serves as the cathode of a dry cell?
Last Answer : The zinc container.
Description : Why is there a small flow current during reverse bias?
Last Answer : In reverse bias there is a small flow of current due to minority charge carries electrons in p region and holes in n region.
Description : A negative damper with negative bias clamps the most positive extremity of the output wave shape to what polarity (positive or negative)?
Last Answer : Negative potential.
Description : What would be the output of a negative clamper with a bias potential of −5 volts and an input voltage swing from +50 to −50 volts?
Last Answer : -5 volts.
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 the most widely used combination-bias system?
Last Answer : The voltage-divider type.
Description : Applying a reverse bias to the gate of an FET has what effect?
Last Answer : Source-to-drain resistance increases.
Description : When the reverse bias on a varactor is increased, what happens to the effective capacitance?
Last Answer : Capacitance decreases.
Description : Which breakdown theory explains the action that takes place in a heavily doped PN-junction with a reverse bias of less than 5 volts?
Last Answer : Zener effect.
Description : What is used to bias a magnetic amplifier so that the control winding remains free to accept control (input) signals?
Last Answer : A bias winding and associated circuitry.
Description : A, when there is an increase in the input voltage, the forward bias of Q1 increases/decreases (which one).
Last Answer : Increases.
Description : In order to reverse bias in a PN junction, what terminal of a battery is connected to the P material?
Description : What causes dc bias energy to be absorbed by avalanche electrons and given up to the microwave field applied to an avalanche transit-time diode?
Last Answer : The negative-resistance property.
Description : Why does using ac vice dc bias voltage result in a stronger output signal?
Last Answer : Because an ac bias voltage of the proper frequency and level places the input signal away from both steps in the magnetism curve. The result is two undistorted output signals that are combined into one strong output.
Description : What are three advantages of adding an ac bias voltage to the input signal instead of adding a fixed dc bias voltage?
Last Answer : a. Reproduces a stronger output signal. b. Greatly improves the SNR. c. Greatly reduces the natural tape hiss.
Description : Why does adding dc vice ac bias voltage to the input signal result in a poor signal-to-noise ratio (SNR)?
Last Answer : With dc bias, the SNR is poor because only a small portion of the magnetism curve is straight enough to use, thus the output signal is weak compared with the natural tape hiss.
Description : How does dc bias added to the input signal correct the distortion in the output signal?
Last Answer : The dc bias moves the input signal away from the step in the magnetism curve. This prevents the input signal from crossing the zero-point of the magnetism curve.
Description : During avalanche effect breakdown, what limits current flow through the diode?
Last Answer : an external current-limiting resistor
Description : What is the effect of current flow through the coil in a d’Arsonval meter movement?
Last Answer : A magnetic field is generated around the coil and the attraction of this field with the permanent magnet causes the coil to move
Description : Is the current flow through an inductor directly proportional or inversely proportional to its inductance value?
Last Answer : Directly proportional.
Description : The purpose of the bias winding in figure 'B' shown in the illustration is for ____________. EL-0091 A. changing the direction of current in the control winding B. setting the operating point of the ... use of either AC or DC in the load circuit D. changing the direction of current through the load
Last Answer : Answer: B
Description : Which of the following statements comparing transistors and vacuum tubes is correct? A. Both transistors and vacuum tubes have a cathode that must be heated to give off electrons. B. A vacuum tube must ... flow. D. The anode of both transistors and vacuum tubes must be heated to give off electrons.
Description : Do electrons flow from the anode to the cathode?
Last Answer : electrons flow from cathode to anode because the electron has a negative charge and repels from the negatively charged cathode whilst also attracting to the positively charged anode.
Description : An instrument thAn instrumAn instrument that must be calibrated in place requires what type of calibration label?
Last Answer : SPECIAL CALIBRATION label.
Description : What type of data transfer requires the most time?
Last Answer : Serial.
Description : What type of ranging circuit is most often used with a radar that requires extremely accurate range data?
Last Answer : Range gate or range step.
Description : What type of switch should be used to control a circuit that requires a temporary actuation signal?
Last Answer : A momentary switch.
Description : What type of prime mover requires a specially designed high-speed alternator?
Last Answer : Steam turbine.
Description : What type filter is used to block the passage of current for a narrow band of frequencies, while allowing current to flow at all frequencies above or below this band?
Last Answer : . Band-reject.
Description : What type of temperature coefficient material does not produce increased heat in response to increased current flow?
Last Answer : Zero-temperature coefficient.
Description : Which of the following statements about continuous cardiac output monitoring are true? A. Continuous cardiac output monitoring may unmask events not detected by intermittent cardiac output measurements. ... stroke volume by detecting changes in resistance to a small, applied alternating current.
Last Answer : Answer: AD DISCUSSION: Various techniques are available to measure cardiac output continuously. The advantages of continuous cardiac output monitoring, as compared with intermittent methods, are (1) ... function of the stroke volume, which then can be used to calculate the cardiac output