# Instrumentation Amplifier – 2 MCQ’s

This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “Instrumentation Amplifier – 2″.

1.

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 differential instrumentation amplifier?
a) 4.95v
b) 1.65v
c) 8.25v
d) 14.85v

2. 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

3. 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

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

5. 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

6. What will be the resistance of a photoconductive cell in darkness?
a) 1000-3000Ω
b) 100MΩ
c) 250-500Ω
d) None of the mentioned

7. 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)].

8. Photo conductive cell changes it resistance with
a) Change in temperature
b) Material composition
d) Change in elasticity

9. Which material is used for photoconductive cells?
a) Germanium
c) Lithium
d) Phosphorous

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

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