41. What instrument is used to amplify the output signal of the transducer?
A. Peaking amplifier
B. Instrumentation amplifier
C. Differential amplifier
D. Bridge amplifier
42. General purpose op-amps are used in applications as
A. Instrumentation amplifier
B. Differential instrumentation amplifier
C. Inverting instrumentation amplifier
D. Non-inverting instrumentation amplifier
43. In an instrumentation amplifier using a transducer bridge, which device measures the change in physical energy?
A. Resistive transducer
B. Indicating meter
C. Capacitive transducer
D. Inductor circuit
44. The temperature of a thermistor increases, when the value of its resistance
A. Remain constant
B. Increase
C. Decrease
D. Depends on the heating material
45. Consider the entire resistors in the bridge circuit are equal. The resistance and change in resistance are given as 3kΩ and 30kΩ. Calculate the output voltage of the differential instrumentation amplifier?
A. 4.95v
B. 1.65v
C. 8.25v
D. 14.85v
46. Consider a thermistor having the following specifications: RF = 150kΩ at a reference temperature of 35oC and temperature coefficient of resistance = 25oC. Determine the change in resistance at 100oC.
A. -1.625MΩ
B. 9.75MΩ
C. 4.78MΩ
D. None of the mentioned
47. Consider the given bridge circuit, and find the voltage across the output terminal, Vab.
A. Vab = 4.9v
B. Vab = -5.6v
C. Vab = 1.2v
D. Vab = -8.2v
48. Express the equation for the transducer bridge, if all the resistor values are equal
A. v = -(△R×Vdc)/(2×R+△R)
B. v = -(△R×Vdc)/2×(R+△R)
C. v = -Vdc/[2×(2×R+△R)].
D. v = -(△R×Vdc)/ [2×(2×R+△R)]
49. Which type of thermistor is chosen for temperature measurement and control?
A. High-temperature coefficient of resistance
B. Low-temperature coefficient of resistance
C. Positive temperature coefficient of resistance
D. None of the mentioned
50. Photoconductive cell changes its resistance with
A. Change in temperature
B. Material composition
C. Incident radiant energy
D. Change in elasticity
51. What will be the resistance of a photoconductive cell in darkness?
A. 1000-3000Ω
B. 100MΩ
C. 250-500Ω
D. None of the mentioned
52. Which material is used for photoconductive cells?
A. Germanium
B. Cadmium sulfide
C. Lithium
D. Phosphorous
53. Name the resistive transducer that varies its resistance on the application of external stress?
A. Photocells
B. Light-dependent
C. Stain gauge
D. None of the mentioned
54. Strain gauges are used to monitor changes in
A. Pressure
B. Torque
C. Displacement
D. All of the mentioned
55. Which type of resistive transducer is most commonly used?
A. Thermistor
B. Photoconductive cell
C. Strain gauge
D. All of the mentioned
56. What is the unit of strain gauge?
A. Ω/oC
B. Lux
C. Newton / meter2
D. Volts
57. Which type of strain gauge has a better resolution?
A. Semiconductor strain gauge
B. Wire strain gauge
C. Wire and Semiconductor strain gauge
D. None of the mentioned
58. How a differential instrumentation amplifier using a transducer bridge can be used as a temperature controller?
A. Increase room temperature
B. Replaces calibrated meter with relay
C. Change the bridge resistance
D. Replace the thermistor with a light intensity meter
59. The strain gauge elements in the analog weight scale are mounted on a
A. Base of weight platform
B. Hanging weight platform
C. Loading weight platform
D. Varying weight platform
60. What will be the resultant circuit, when the thermistor in the bridge transducer is replaced by a strain gauge?
A. Differential input and differential output amplifier
B. Light intensity
C. Analog weight scale
D. None of the mentioned