In this post, some of important questions of electrical welding is discussed which include advantages and disadvantages of seam welding, application of seam welding, projection welding, meaning of platens, applications of projection welding, percussion welding, upset butt welding and non-pressure welding.
In this post, some of important questions of electrical welding is discussed which include meaning of welding, principle of resistance welding, types of resistance welding, advantages and disadvantages of resistance welding, spot welding, advantages and applications of spot welding, seam welding and different types of seam welding.
In this post, some of the important questions of binary codes are given. It includes different types of binary codes, meaning of alphanumeric code and numeric code, meaning of BCD code, code word meaning, different types of BCD code, weighted code and non-weighted code, positive weighted code and negative weighted code, sequential code, self-complementing code, cyclic code, unit distant code, application of cyclic code, 8421 BCD code
Modified series Inverter
The capacitor supply 50% of the load current and the DC source supply 50% of the total load current therefore the load current is drawn not only form the supply source but also from the capacitor in the modified series inverter.
Function
of the
Inverter
The
function of the inverter is to convert fixed DC into variable voltage, variable
frequency alternating supply.
Explain the term : DC link
converter
DC link converter
State the function of the
cycloconverter.
Function of the
cycloconverter
The function of the cycloconverter is to convert constant voltage, constant frequency into variable voltage, and variable frequency without any intermediate stage.
Describe the function of the DC choppers.
Function of the DC choppers
The function of the DC choppers is to convert fixed direct voltage into variable direct voltage.
What are the different technologies to convert fixed direct voltage into variable direct voltage?
Which chopper is also called as four quadrant chopper?
Type E chopper
What is meant by RLE
load?
It is simple motor load in which E indicates back emf
of the motor.
Which chopper is also
called as two quadrant chopper?
Type B chopper and type C chopper
The body spreading
resistance in the IGBT is reduced by making body region heavily doped.
How the latching problems in the IGBT can be avoided?
The latching problem in the IGBT is avoided by modifying doping level and geometry of the body layer.
The IGBT has combine
characteristics of the MOSFET and BJT
MOSFET
The switching speed of
the MOSFET is high
The on-state voltage drop per unit area is very high therefore it has high on state power loss.
State the
full form of GTO.
Gate
turn off thyristor
Describe the main disadvantage of the SCR.
Disadvantage of SCR
The SCR is turn on by the gate pulse. When the gate signal is removed, the SCR does not turn off but remains in the ON condition. The SCR is turned off only by reducing the forward current below the holding current. This is serious disadvantage of the SCR.
What is meaning of commutation of SCR?
Commutation
The process by which the
SCR is turned off from turn on condition is called as commutation.
Describe the different methods of commutation of the SCR.
Commutation of the SCR
The rise time of the SCR
is reduced by applying steep and high current gate pulses.
Why the turn on losses is the highest during rise time of the
SCR?
The turn on losses is
highest during rise time because high anode voltage and large anode current
occurs simultaneously during this period.
Why an inductor is placed in series with anode circuit in the SCR?
Silicon
controlled rectifier
Which are the different methods for fabrication of the
thyristor?
Fabrication
of the thyrister
All diffused
Alloy diffused
In this post, some of the important questions of programmable unijunction transistor are given. It includes full form of PUT, full form of CSCR, main features of PUT, junction of PUT, advantages of PUT, PUT as a complementary SCR and PUT Relaxation circuit.
In this post, some of the important questions of UJT are given. It includes full form of UJT, terminals of UJT, inter-base resistance, intrinsic stand-off ratio and application of UJT.
In
this post, some of the important questions of Triac are given. It includes full
form of Triac, Triac is bidirectional, terminals of Triac and advantages and
disadvantages of Triac.
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Describe the meaning of DIAC.
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The DIAC signify that the diode works
on AC.
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In this post, some of the important questions of differentiator and integrator is given. It includes differentiate circuit, conditions for differentiate circuit, integrating circuit, conditions for integrating circuit and output of differentiate and integrating circuit.
In this post, some of the important question and answers of clipper and clamper circuit is given. These questions are related to clipper circuit, types of clipper circuit, positive and negative clipper, applications of clipper circuit, clamper circuit and positive and negative clamper circuit.
