Signal Conditioning Circuits Mid - I, September - 2014

1.In capacitive transducers with a solid dielectric and variable air gap between parallel plates, the sensitivity N1 depends on
  • Ratio of d2/d1 of the dielectric thickness
  • Permittivity ε2 of the solid dielectric
  • Both a and b
  • None of the above
Answer: C
2.Which of the following is not a variable – resistance transducer
  • LDR
  • Strain gauge
  • Resistive hygrometer
  • Thermo couple
Answer: D
3.The thermistor is doped with metal oxides of
  • Fe3O4
  • NiO
  • Mn2O3
  • All of the above
Answer: D
4.The main disadvantage of ____________ transducer is lack of steady state response and high electric output impedance
  • LDR
  • Piezo electric
  • Laminated ferro magnetic core
  • Capacitive
Answer: B
5.In force voltage analogy, the electrical equivalent of “displacement” is ________
  • charge
  • voltage
  • current
  • mass
Answer: A
6.The electrodynamometer generator – type transducer is an active transducer based on ______________ law of electromechanical energy conversion
  • ampere’s
  • newton’s
  • faraday’s
  • ohm’s
Answer: C
7.The electrical noise of potentiometer has a uniform spectrum and its magnitude depends on
  • resistance
  • temperature
  • both a) and b)
  • none of the above
Answer: C
8.A variation in capacitance can be obtained by changing
  • the distance between two or more parallel plates
  • the dielectric constant of the dielectric or parts of it
  • the effective area of close proximity between serrated plates
  • all the above
Answer: D
9.The miniature pressure transducer for using wind/tunnel model is used in conjunction with _______________________ circuit followed by a __________ and phase sensitive demodulator
  • blumlien circuit, carrier amplifier
  • wheat stone bridge, carrier amplifier
  • blumlien circuit, differential amplifier
  • wheat stone bridge, instrumentation amplifier
Answer: A
10.in a practical electrostatic force/ pressure receiver, the resistance R0 should be as _____ possible in order to boost both output voltage and useful frequency range
  • small
  • large
  • medium
  • any value
Answer: B
11.The translation factor ‘n’ governing the relationship between the rectilinear mechanical system and electrical system in direct analogy is given by n = _________
Answer: n = 1
12.If the flux variations are produced by the change of reluctance it is called a ________________ transducer
Answer: Electro magnetic
13.Materials with low melting points show ___________ creep even at room temperature.
Answer: Large
14.The gauge factor is given by ________________________
Answer:
15.The semiconductor anemometers can be used for the measurement of ____________ varying airflow
Answer: slowly
16.The change of temperature Δt when a variable resistance transducer is placed in the fluid in motion is given by _____________
Answer: Rv2/2Cp
17.For a piezoelectric transducer the transducer constant N is given by ___________
Answer: N = S
18.In capacitance transducers with solid dielectric variable airgap between the parallel plates, the sensitivity factor is given by N1 = _____________________
Answer:
19.The transducer constant of a electrostatic force receiver is given by __________
Answer: M = E1/jωd
20.The main difference between hysteresis and creep is that the latter depends on ________________
Answer: time