Q.1.
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
Q.2.
- a) 4.95v
- b) 1.65v
- c) 8.25v
- d) 14.85v
Q.3.
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
Q.4.
Consider the given bridge circuit, find the voltage across the output terminal, Vab.
- a) Vab = 4.9v
- b) Vab = -5.6v
- c) Vab =1.2v
- d) Vab =-8.2v
Q.5.
Express the equation for 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)].
Q.6.
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
Q.7.
Photo conductive cell changes it resistance with
- a) Change in temperature
- b) Material composition
- c) Incident radiant energy
- d) Change in elasticity
Q.8.
What will be the resistance of a photoconductive cell in darkness?
- a) 1000-3000Ω
- b) 100MΩ
- c) 250-500Ω
- d) None of the mentioned
Q.9.
Which material is used for photoconductive cells?
- a) Germanium
- b) Cadmium sulphide
- c) Lithium
- d) Phosphorous
Q.10.
Name the resistive transducer that varies its resistance on application of external stress?
- a) Photocells
- b) Light dependent
- c) Stain gage
- d) None of the mentioned