Description : In Fraunhofer diffraction wave front used is __________. A. Spherical B. Circular C. Plane D. Conical 71.In diffraction pattern of monochromatic light the bright bands formed are __________. A. of uniform intensity B. of non-uniform intensity C. of uniform width D. is of different colors
Last Answer : A. of uniform intensity
Description : The distance from a radar set to a target measured along the line of sight is identified by what term?
Last Answer : Range.
Description : Why is the physical length of a coaxial cable transmission line shorter than its electrical length? A. Skin effect is less pronounced in the coaxial cable B. RF energy moves slower along the ... higher in the parallel feed line D. The characteristic impedance is higher in the parallel feed line
Last Answer : B. RF energy moves slower along the coaxial cable
Description : Refers to one of the front end circuit of a VHF TV superheterodyne receiver which is usually a separate circuit coupled to the mixer. A. Antenna feed B. AGC C. RF amplifier D. Local oscillator
Last Answer : D. Local oscillator
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 : What problem is caused in an rf amplifier by a loosely coupled transformer?
Last Answer : A too-narrow bandpass.
Description : What is the most common form of coupling for an rf amplifier?
Last Answer : Transformer coupling.
Description : Can a parallel LC circuit be used as the frequency determining network for an rf amplifier?
Last Answer : Yes.
Description : What is the purpose of a frequency-determining network in an rf amplifier?
Last Answer : To provide maximum impedance at the desired frequency.
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 : What is the result of pulsing a pulsed rf amplifier when no rf is present?
Last Answer : Oscillations at an undesired frequency.
Description : The Doppler effect causes a change in what aspect of rf energy that strikes a moving object?
Last Answer : Frequency.
Description : Atmospheric interference with the travel of electromagnetic energy increases with what rf energy characteristic?
Description : At what point on an open-circuited rf line do voltage peaks occur?
Last Answer : At 1/2 wavelength from the end and at every 1/2 wavelength along the line
Description : If the rf amplifier discussed has an 80 milliwatt input, what would be the maximum output?
Last Answer : 800 watts.
Description : What is the most common method of testing a fixed rf attenuator?
Last Answer : Rf substitution method.
Description : Normally, how are high-power rf tubes tested?
Last Answer : In their circuit.
Description : Name the three main sections of a typical rf signal generator.
Last Answer : Oscillator circuit, modulator, and output control circuit.
Description : If a wave's electric lines of force rotate through 360 degrees with every cycle of rf energy, what is the polarization of this wave?
Last Answer : Circular polarization.
Description : How does the reactance-tube modulator impress intelligence onto an rf carrier?
Last Answer : By changing the reactance of an oscillator circuit in consonance with the modulating voltage.
Description : For what class of operation is the final rf power amplifier of a plate-modulator circuit biased?
Last Answer : Class C
Description : Which one of the following geometric errors of satellite sensors is random? (A) Scan skew (B) Panoramic distortion (C) Earth rotation (D) Altitude variation
Last Answer : Answer: Option D
Description : A 60-year-old man was diagnosed last year with adenocarcinoma of the lung, and a 4 cm mass lesion was treated with a right lower lobectomy. He now has an ... 2) Membranous glomerulonephritis 3) Minimal change glomerulonephritis 4) Nodular glomerulosclerosis 5) Rapidly progressive glomerulonephritis
Last Answer : Answers-2 Most cases of membranous GN are idiopathic, but in some patients there is a history of an infection or a malignancy (usually lung) with antigenemia.
Description : Its …….. goal is to meet in said pattern by providing all the necessary data on the energy consumption as well as certain driving factors as identified during preliminary investigation. a. Secondary. c. Primary b. Tertiary. d. None.
Last Answer : primary
Description : 92. Its …….. goal is to meet in said pattern by providing all the necessary data on the energy consumption as well as certain driving factors as identified during preliminary investigation. a. Secondary. c. Primary b. Tertiary. d. None
Description : Raster scan or tv scan video monitors are used extensively for what purpose?
Last Answer : The display of alphanumeric data and graphics.
Description : What is shielding in NMR? A. Using a curved piece of metal to block an opponent’s attack B. Putting metal around an Rf source C. When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei D. Blocking parts of a molecule from Rf radiation
Last Answer : When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
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 : Why must cables and wires be identified?
Last Answer : To provide the technician with a means to trace the wires when troubleshooting and repairing electrical and electronic systems.
Description : Which type of optical source tends to operate at higher drive currents to produce light?
Last Answer : Laser.
Description : What term is used to describe a spread spectrum communications system in which a very fast binary bit stream is used to shift the phase of an RF carrier? A. Frequency hopping B. Direct sequence C. Binary phase-shift keying D. Phase compandored spread spectrum
Last Answer : B. Direct sequence
Description : For rotary cutting blade the proper cutting quality is affected by A)rates of forward speed to blade pert pheral speed B)radius of rotation of cutting blade C)feed per blade D)all of these
Last Answer : D)all of these
Description : What two receiver leads are reversed to reverse the rotor's direction of rotation?
Last Answer : 1 and S3.
Description : What factors determine the direction of rotation in a dc motor?
Last Answer : Direction of armature current, and direction of magnetic flux in field.
Description : What is the primary disadvantage of the pointer arrangement for indicating coil rotation?
Last Answer : Coil balance.
Description : In a galvanometer, what two methods are used to indicate the amount of coil rotation?
Last Answer : The pointer arrangement and the light and mirror arrangement.
Last Answer : he pointer arrangement and the light and mirror arrangement.
Description : The use of antibiotics can be based on either the clinical course of a patient without the benefit of well-defined microbiologic data (empiric therapy), or targeted at ... which polymicrobial infection is identified, specifically-directed treatment for the predominant organism is satisfactory
Last Answer : Answer: c The use of empiric therapy without the benefit of well-defined microbiologic data is appropriate when there is sufficient clinical evidence to support the diagnosis such that it would ... components of the infection if the body site is such that these microorganisms may be present
Description : Which one of the following structural formulae of two organic compounds is correctly identified along with its related function? (a) B : Adenine - A nucleotide that makes up nucleic acids (b) A : Triglyceride - ... ) B : Uracil - A component of DNA (d) A : Lecithin - A component of cell membrane
Last Answer : (d) A : Lecithin - A component of cell membrane
Description : Which of the following terms is given to hypertension in which the blood pressure, which is controlled with therapy, becomes uncontrolled (abnormally high) with the discontinuation of therapy? ... Secondary hypertension denotes high blood pressure from an identified cause, such as renal disease.
Last Answer : a) Rebound Rebound hypertension may precipitate a hypertensive crisis.
Description : When the surgeon performs an appendectomy, the nurse recognizes that the surgical category will be identified as a) clean contaminated. Clean-contaminated cases are those with a potential, limited ... with foreign bodies, fecal contamination, or purulent drainage would be considered a dirty case.
Last Answer : a) clean contaminated. Clean-contaminated cases are those with a potential, limited source for infection, the exposure to which, to a large extent, can be controlled.
Description : An identified source of irrigation water has ion concentrations of Na+ , Ca++ and Mg++ as 20, 10 and 8 milliequivalents per litre, respectively. The SAR of this water is approximately : a) 2.06 b) 6.67 c) 2.67 d) zero
Last Answer : b) 6.67
Description : What pattern would be formed if sawdust was sprinkled on the glass instead of iron filings?
Last Answer : No specific pattern, sawdust is a nonmagnetic material.
Description : What is the radiation pattern of a quarter-wave antenna?
Last Answer : A circular radiation pattern in the horizontal plane, or same as a half wave.
Description : Since the radiation pattern of a dipole is similar to that of a doublet, what will happen to the pattern if the length of the doublet is increased?
Last Answer : The pattern would flatten.
Description : . If a basic half-wave antenna is mounted vertically, what type of radiation pattern will be produced?
Last Answer : Nondirectional.
Description : hat two factors determine the directivity pattern of the parasitic array?
Last Answer : Length of the parasitic element (tuning) and spacing between the parasitic and driven elements.
Description : What is the primary difference between the major and minor lobes of a radiation pattern?
Last Answer : Major lobes have the greatest amount of radiation.
Description : Best way to drill a hole in a cowry and conical shell?
Last Answer : If you can’t do what you want to do with a Dremel and one of it’s many magical attachments, then I am already out of ideas. Sorry… but, have you tried using the Dremel on a very low speed? .