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Code No: RR320204
Set No. 1
III B.Tech II Semester Regular Examinations, Apr/May 2006
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. Distinguish the important characteristics of instrument that are totally electrical
and totally electronic in nature.
2. Explain the techniques of pulse-time modulation and pulse code modulation and
their relative merits.
(a) What effect does increasing the writing rate of an oscilloscope by increasing
the accelerating potential have on the deflection sensitivity.
(b) How much voltage is required across two deflection plates separated by 1 cm
to deflect an electron beam 1 degree, If the effective length of the deflection
plates is 2cm and the accelerating potential is 1000 volts?
(a) Explain with a neat block diagram of a dual slope digital voltmeter.
(b) A dual slope integrating type of A/D converter has an integrating capacitor
of 0.1 microfarad and a resistance of 100k.ohms. If the reference voltage is 2v,
and the output of an integrator is not to exceed 10v, what is the maximum
time the reference voltage can be integrated
(a) What are the various types of inductive transducers?
(b) Explain in detail the working of inductive transducers operating on the prin-
ciple of eddy currents?
(a) Explain in detail the application of RVDT?
(b) Discuss in detail the operation of a synchros?
(a) A strain bridge comprises of two fixed resistors each of value 120 ohms one
active gauge and an unstrained temperature compensation gauge. The two
gauges are of unstrained resistance 120 ohms and gauge fac