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E4811 Pages:

PART C
Answer any two questions, each carries 10 marks
Give the basic principle of working of an electrostatic voltmeter. Also describe
how would ൮0൨ increase operating forces
Describe an experiment for obtaining flux density in a specimen of magnetic
material with the help of ballistic galvanometer.
Mention the digital methods for determining rotational speed.
A 1000/5۸, 50 Hz current transformer has a secondary burden comprising a
non-inductive impedance of 1.6Q. The primary winding has one turn. Calculate
the flux in the core and ratio error at full load. Neglect leakage reactance and
assume iron loss in the core to be 1.5W at full load and mmf=100A.
State the components of iron loss and write down their expressions.
Describe the working of hall effect sensors.
A solenoid 1m long and wound with 960 turns has a search coil ௦760 turns
and cross-sectional area 340mm‘ at its centre.Reversing a current of 3.5A in the
solenoid causes a deflection of 4 divisions in a ballistic galvanometer connected
to the search coil.Calculate:
i)Galvanometer constant in flux linkages per division ii) Flux linkage sensitivity
PART D
Answer any two questions, each carries 10 marks
Define transducers and classify them.
Using Schering bridge show how capacitance and dissipation factor of unknown
capacitor is measured.
Draw the block diagram of generalized digital data acquisition system and
describe the function of each component.
Draw the block diagram of digital Storage oscilloscope. State the three modes of
operation
Define the deflection sensitivity of CRT.
With the help of neat sketch explain the working of LVDT. Also draw its
characteristics.
Determine the equivalent parallel resistance and capacitance that causes a Wein
bridge to null with the following component values. R)=2.7K, (15117,
R2=22K, R4=100K operating frequency 2.2KHz.

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