Instrumentation Mid - II, November - 2014

1.In a photo transistor
  • No base terminal is provided
  • base collector junction is small
  • Base collector junction is large
  • both
Answer: D
2.Piezo electric crystal is
  • Active transducer
  • primary transducer
  • Inverse transducer
  • digital transducer
Answer: C
3.The dark current in the photo diode is due to
  • Forward current
  • reverse current
  • Both A& B
  • none
Answer: B
4.The output voltage of LVDT is linear function of
  • Velocity
  • area
  • Displacement
  • none
Answer: C
5.Strain gauge is used to measure
  • Displacement
  • force
  • Torque
  • all of the above
Answer: D
6.Example of active transducer
  • Load cell
  • thermocouple
  • Photo voltaic cell
  • strain gauge
Answer: C
7.For metals gauge factor is given by
  • 1/ (1+2 μ)
  • 1+2μ
  • μ/ (1+2μ)
  • (1+2μ)/μ
Answer: B
8.Thermopile is a combination of thermocouples
  • Series
  • parallel
  • A&B
  • none
Answer: C
9.Most commonly used metal in RTD is
  • Platinum
  • copper
  • Aluminum
  • nickel
Answer: A
10.Angular velocity can be measured by using
  • Speedo meter
  • barometer
  • Tachometer
  • bolometer
Answer: C
11.Spectrum analyzer is used to display the signals in _______________
Answer: Frequency domain
12.RF analyzers are working on the______________ principle.
Answer: Heterodyne
13.Harmonic distortion is present because of nonlinear components in the circuit.
Answer: Nonlinear components
14.Q meters works based on _________________.
Answer: Series resonance
15.In true RMS voltmeter _____________ in the input thermocouple is equals to the ____________ in the feedback thermocouple.
Answer: AC current, DC current
16.Transducer is a device which converts ______________ variable into _____________ variable.
Answer: Mechanical, electrical
17.Load cell is used to measure the ________________
Answer: Pressure
18.Photo voltaic cell is _____________ transducer.
Answer: Active
19.Mcleod gauge is used to measure the ______________ by using boilers law.
Answer: Vacuum pressure
20.Total radiation pyrometer is used to measure the temperature in the range of _______________
Answer: 1200°c-3500°c