M.Sc. (Semester IV) (CBCS) Examination Nov/Dec-2018
Physics (Applied Electronics)
INSTRUMENTATION
Time: 2½ Hours Max. Marks: 70
Instructions: Q.1 and Q.2 is compulsory.
Any three questions from Q.3 to Q.7.
All questions carry equal marks.
Q.1 Select correct alternatives: 08
The gauge factor is defined as
ΔL/L ΔR/R ΔR/R ΔL/L
ΔR/R ΔD/D ΔR/R
One of the following can act as an inverse transducer
Electrical resistance potentiometer LVDT
Capacitive transducer Piezoelectric crystals
Which of the following device can be used for measurement of
frequency?
Voltmeter Ammeter
Stroboscope None of the mentioned
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
Which transducer is known as 'self-generating transducer'?
Active transducer Passive transducer
Secondary transducer Analog transducer
Principally CRO is a
Ammeter Voltmeter
Wattmeter Watt-hour meter
In an instrumentation amplifier using transducer bridge, which device
measure the change in physical energy
Capacitive transducer Indicating meter
Resistive transducer Inductor circuit
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.
Q.1 State True or False:- 06
Resolution of 8 bit ADC is 255.
X-Y plates in CRO is part of electron gun.
De sauty's bridge is suitable only for pure capacitor.
Thermocouple is self-power transducer.
pH is measurement of OH+ ions only.
Parallel ADC are known as fastest ADC.
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SLR-VQ-466
Q.2 Attempt the following:
Explain basic principle of piezoelectric transducer.
Explain Absolute value circuit.
Short note on Advantages of virtual instrumentation.
14
05
05
04
Q.3 Explain construction and working of strain gauge.
Explain R2R ladder DAC.
08
06
Q.4 Explain strain gauge and device equation for gauge factor.
Explain peak detector circuit in detail.
08
06
Q.5 Explain universal counter in detail.
Explain the principle of phase sensitive detection.
08
06
Q.6 Explain F to V conversion in detail. 08
Explain sample and hold circuit. 06
Q.7 Explain DSO and its applications in details. 08
What are the different applications of the virtual instrumentation? 06