Answer / devendra_kushwaha27

When an AC excitation signal is applied to the Primary Coil
(P), voltages are induced in the two Secondary Coils (S).
The MAGNETIC CORE inside the COIL WINDING ASSEMBLY provides
the magnetic flux path linking the Primary and secondary
Coils.Since the two voltages are of opposite polarity, the
Secondary Coils are connected series opposing in the
center, or Null Position. The output voltages are equal
and opposite in polarity and, therefore, the output voltage
is zero. The Null Position of an LVDT is extremely stable
and repeatable.
When the MAGNETIC CORE is displaced rom the Null
Position, an electromagnetic imbalance occurs. This
imbalance generates a differential AC output voltage
across the Secondary Coils which is linearly proportional
to the direction and magnitude of the displacement.
As shown in the figure, when the MAGNETIC CORE is moved
from the Null
Position, the induced voltage in the Secondary Coil, toward
which the Core is
moved, increases while the induced voltage in the opposite
Secondary Coil
decreases.
LVDTs possess the inherent ruggedness and durability of a
transformer and
truly provide infinite resolution in all types of
environments. As a result of the
superior reliability and accuracy of LVDTs, they are the
ideal choice for linear
motion control.
LVDT Principle of Operation Page 1 of 2
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Answer / faiyaz ahmad

Mutual induction

Paper Details: company -- Hindustan Copper Limited post -- GET 2008 Date -- 03.08.2008 Dept.-- Electronics?Instrumentation Aptitude -- 70 Technical-- 80 Total Time -- 2hr 30min I have listed the question I could able to remember 1. BCD equivalent of 43 2. value of K for stability of a system from a given equation 3. transformer connection for darlington connection 4. damping of balastic galvanometer 5. advantage of chart-pen recorder over CRo 6. CRO - how to change bandwidth 7. questions on CRO construction 8. reverse saturation current of si diode 9. advantage of wire wound resistance over carbon resistance 10. core material for a small coil 11. max fanout-- TTL/ECL/CMOS/MOS 12. component of resistance of monolithic IC 13. functions of capacitors in multivibrators 14. to change a sawtooth signal into a square wave we use-- schmit trigger/ schottkey diode/ zener diode 15. relation b/w á & â in transistor ckt 16. function of SiO2 layer in fabrication 17. 3 questions on ODD MAN OUT

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