Description : What test equipment is designed to generate, modify, or measure a range of parameters of electronic functions of a specific nature required to test a single system or equipment?
Last Answer : Special-purpose electronic test equipment.
Last Answer : Yes dynamic impedance of zener diode vary.
Description : Define given parameters and state their values for bridge rectifier (i) Ripple factor (ii) PIV of diode.
Last Answer : Ripple Factor: Ripple Factor is defined as the ratio of RMS value of the AC component of output to the DC or average value of the output. Mathematically it is expressed as, ( ... which appears across non-conducting reverse biased diode. (ii) PIV of diode for bridge rectifier-Vm
Description : When a wide band of frequencies is transmitted simultaneously, each frequency will vary in the amount of fading. What is this variable fading called?
Last Answer : Selective fading.
Description : A tube has a transconductance of 800 mhos and a load resistor of 50 kohms. When control grid voltage varies by 6 volts, the plate voltage will vary by what amount?
Last Answer : 240 volts.
Description : If the mu of a tube is 85 and the signal at the control grid is 4 volts ac, the plate voltage will vary by what amount?
Last Answer : 340 volts.
Description : The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?
Last Answer : 42.
Description : Will an optical fiber's attenuation coefficient vary with changes in wavelength?
Last Answer : Yes.
Description : How much must the fpa plate current vary to produce 100- percent modulation in a plate modulator?
Last Answer : Between 0 and nearly two times its unmodulated value.
Description : List the key operational parameters used to define receiver performance.
Last Answer : Receiver sensitivity, bandwidth, and dynamic range.
Description : List five system design parameters considered when system designers choose the system operational wavelength and link components.
Last Answer : Launch power, connection losses, bandwidth, cost, and reliability
Description : Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed? (A) ... of large particles (upto 1.25 cms) (D) Dry grinding of large particles in un-baffed mills
Last Answer : (D) Dry grinding of large particles in un-baffed mills
Description : For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary (A) Directly as square of gas density (B) Directly as gas density (C) Directly as square root of gas density (D) Inversely as gas density
Last Answer : (B) Directly as gas density
Description : Which of the following describes the main purpose of corporate governance? a) Establish short-term strategic objectives for a company. b) Ensure collective strategic decisions for a company. c) ... and prudent management of a company. d) Establish and monitor the operating parameters for a company
Last Answer : c) Facilitate effective, entrepreneurial and prudent management of a company.
Description : During secular variation of magnetic meridian at different places (A) Range of oscillations is constant (B) Period of oscillation is constant (C) Range and period of oscillation both vary (D) Period of oscillation only varies
Last Answer : (C) Range and period of oscillation both vary
Description : What is the relative length of the time constant for the diode capacitor combination in a damper (long or short)?
Last Answer : Short time constant.
Description : What is the condition of the diode in a series limiter when an output is developed? In a parallel limiter?
Last Answer : Conducting, cutoff.
Description : In the tunnel diode, the tunneling current is at what level when the forbidden gap of the N-type material is at the same energy level as the empty states of the P-type material?
Last Answer : Minimum.
Description : Why is electron flow with the arrow in the symbol of a Zener diode instead of against the arrow as it is in a normal diode?
Last Answer : Because Zener diodes are operated in the reverse bias mode.
Description : During avalanche effect breakdown, what limits current flow through the diode?
Last Answer : an external current-limiting resistor
Description : What is the doping level of an avalanche effect diode when compared to the doping level of a Zener-effect diode?
Last Answer : The doping level of an avalanche effect diode is lower.
Description : What is the name of the simplest type of rectifier which uses one diode?
Last Answer : The half-wave rectifier.
Description : When checking a diode with an ohmmeter, what is indicated by two high resistance measurements?
Last Answer : The diode is open or has a high-forward resistance.
Description : What is the greatest threat to a diode?
Last Answer : Heat.
Description : What type of diode has orange, blue, and gray bands?
Last Answer : 1N368.
Description : What is meant by diode ratings?
Last Answer : They are the limiting values of operating conditions outside which operations could cause diode damage.
Description : What type of bias makes a diode act as a closed switch?
Last Answer : Forward bias.
Description : What type of PN diode is formed by using a fine metal wire and a section of N-type semiconductor material?
Last Answer : Point-contact.
Description : In reference to the schematic symbol for a diode, do electrons flow toward or away from the arrow?
Last Answer : Toward the arrow.
Description : What is the purpose of a PN junction diode?
Last Answer : To convert alternating current into direct current
Description : For a diode to act as a rectifier, should it be connected in series or parallel with the load?
Last Answer : Series.
Description : What term is used to describe the period when the diode is not conducting?
Last Answer : Cutoff.
Description : Describe the output of a laser diode.
Last Answer : The LD's output has a narrow spectral width and small output beam angle.
Description : Why would a laser diode be used in a low-data-rate digital application?
Last Answer : When extremely high transmitter output powers are required.
Description : Is the drive circuitry generally more complex for an LED or a laser diode? Why?
Last Answer : For a laser diode. The laser diode transmitter generally contains output power control circuitry and may contain a TE cooler and some circuitry associated with the TE cooler.
Description : What is the typical back-to-forward resistance ratio of a good-quality diode?
Last Answer : 10-to-1 ratio.
Description : At frequencies above 100 megahertz, the intrinsic (i) region causes a pin diode to act as what?
Last Answer : Variable resistance.
Description : What are the most important advantages of the Schottky barrier diode?
Last Answer : Lower forward resistance and low noise.
Description : What is the capacitive reactance across a point-contact diode as compared to a normal junction diode?
Last Answer : Lower.
Description : During the manufacture of a point-contact diode, what is the purpose of passing a relatively large current from the catwhisker to the silicon crystal?
Last Answer : . To form a small region of p-type 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 : What is the junction arrangement of the original avalanche transit-time diode?
Last Answer : Pnin.
Description : What limits the usefulness of high-gain, tunnel-diode frequency converters?
Last Answer : Stability problems.
Description : What is the purpose of the circulator in a tunnel-diode amplifier?
Last Answer : Prevent feedback to the tuned input circuit.
Description : Why is the tunnel diode loosely coupled to the cavity in a tunnel-diode oscillator?
Last Answer : To increase the stability.
Description : The pin diode is primarily used for what purpose?
Last Answer : A switching device.
Description : What determines the frequency of a tunnel-diode oscillator?
Last Answer : The tuned circuit or cavity frequency.
Description : What is the primary difference between a diode and a triode?
Last Answer : The triode contains a third element called the control rid.
Description : A large negative voltage is applied to the plate of a diode, and a largewhat tube parameter has been exceeded?
Last Answer : Peak Inverse Voltage (PIV).
Description : An ac voltage is applied across a diode. The tube will conduct when
Last Answer : Positive.