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positive clippersthe shunt connected positive clipper in which the diode conducts for positive half cycle and hence the output is a straight line
q draw and explain diode clipping circuit a diode clipping circuit can be used to limit the voltage swing of a signal clipper circuits are used to
explain the dynamic or vibration tests tests of this type also known as sonic integrity test involve sub- jecting the element to a single impulsive
define limitations of radiography - underwater inspection of bridgei radiography is a costly and time consuming method which re- quires extensive
define radiography - underwater inspection of bridgeradiographic non-destructive examination of components is based on the phenomenon that materials
define limitations of underwater magnetic particle testingas with any non-destructive test method uwmt has some limitations as underi underwater
q explain the basic principle of linear sweep voltage generatora linear time base generator or sweep generator is one that provides an output
define equipments required for conducting uwmtequipments required for conducting uwmt areinspection equipmentaelectronic yoke with power cablebground
define underwater magnetic particle testingunderwater magnetic particle testing uwmt is a non-destructive testing suited for detection of surface
q the input to the differentiator circuit is a sinusoidal voltage of peak value 5mv and frequency 1khz find out the output if r100k and
define the ultrasonic thickness measurementultrasonic thickness meters measure the thickness of steel by passing an ultrasonic wave through the
thermal noisethis is the most significant noise in an amplier it is produced by random movements of electrons in the resistors this is caused by the
explain noise noise is unwanted signals which degrade the desired signal content and therefore the performance of the system noise might be produced
define reinforcing steel - limitations of ultrasonic systemthe sound velocity measurement taken parallel to the reinforcing bars embedded in the
define concrete surface finish - limitations of ultrasonic systemthe smoothness of the surface under test is important to ensure proper acoustical
explain frequency reuse in the cellular concept service area is separated into regions called cells and the available frequency is divided among
define cleanliness of surface - limitations of ultrasonic systemsound energy transmission is greatly affected by marine growth on the surface of the
q what is miller integrator miller integrator consider a basic rc circuit in which the opening of switch provides a sweep voltageyhe waveform
commutatorthe function of a commutator is to change alternating current induced in the armature into unidirectional current the commutator is of
q draw the differentiator circuit explain its principle of operation with necessary waveforms a circuit in which the output voltage is directly
armature core and armature winding armature is the rotating part of the machine it is cylindrical in shape with slots on its outer periphery it
interpoles or commutating polesinterpoles are xed to the frame in among main poles they are used for sparkless commutationie to improve
field winding every pole core has one or more eld windings provided on it to make a magnetic eld whenever they carry current they electromagnetic the
pole core and pole shoethe pole cores are made of steel laminations that are insulated from each other and riveted together every pole core has a
yoke or magnetic frameit is the outer cover of the machine an even number of pole cores are bolted to the yoke its serves the following purposes1 it