M.Sc. (Semester III) (CBCS) Examination Mar/Apr-2018
Physics (Applied Electronics)
INSTRUMENTATION
Time: 2½ Hours.
Max. Marks: 70
Instructions: All questions carry equal marks. Q. 1 and Q.2 are compulsory. Attempt any three from Q.3 to Q.7.
Q.1

Select correct alternatives:
08
A strip chart recorder is
An active transducer
An inverse transducer
An output transducer
Both
The gauge factor is defined as
ΔL/L ΔR/R
ΔR/R ΔL/L
ΔR/R ΔD/D
ΔR/R
A transducer has an output impedance 1KΩ and load resistance 1MΩ, the transducer behaves as
A constant current source
A constant voltage source
A constant power source
None of the above
One of the following can act as inverse transducer
Electrical resistance potentiometer
LVDT
Capacitive transducer
Piezoelectric crystals
A buffer amplifier has gain of
Infinity
Zero
Unity
Dependent upon the circuit parameter
Offset voltage in OPAMPS are produced because of
Variations in the input voltage applied to amplifier
Mismatch between the input signals applied to the OPAMP
Mismatch between the two differential amplifiers which form IC of the OPAMP
None of the above
If an information is required to be stored over a short interval of time
A single number/devices should be used
A CRO with photographic equipment should be used
A direct writing recorder or a magnetic tape recorder should be used
A storage type oscilloscope should be used
Digital instrument have input impedance of the order of
mΩ
Ω
kΩ
MΩ
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SLR-UR-574
Q.1

State whether following statements true or false:
06
Photo emissive cell is an active transducer.
Unbounded strain gauges are exclusively used for transducer applications.
Capacitive transducer are normally used for both static and dynamic measurement
Resolution of 8 bit ADC is 128
X-Y plates in CRO is part of electron gun
De sauty's bridge is suitable only for pure capacitor
Q.2
Attempt the following:
Explain basic principle of hall effect
05
Explain isolation amplifier
05
Explain sample and hold circuit
04
Q.3
Explain different capacitance transducer in detail.
08
Explain triangular wave generator in detail.
06
Q.4
Explain strain gauge and derive equation for gauge factor.
08
Explain peak detector circuit in detail.
06
Q.5
Explain R2R ladder DAC in detail.
08
Explain the concept of virtual instrumentation.
06
Q.6
Explain the different digital voltmeter in detail.
08
Explain the resistance measurement techniques in detail.
06
Q.7
Explain in detail the dual trace CRO with time base generation.
08
Explain universal counter in detail.
06