# MCQs on Transducers – Characteristic Parameters

1 - Question

What is the nature of resistance to light intensity graph of an LDR (Light dependent resistor)?
a) Increasing
b) Decreasing
c) Parabolic
d) Constant
Explanation: The resistance to light intensity graph of an LDR (Light dependent resistor) has a decreasing nature. As the intensity of the light falling on the LDR (Light dependent resistor) increases, the value of its resistance decreases.

2 - Question

What is the absolute error of an observation taken by an ultrasonic sensor which predicts the distance of an object to be 5.1 cm but the actual value is 5 cm?
a) 1.02
b) 0.1v
c) 0.01v
d) 1
Explanation:Given: Actual Value=5cm Measured Value=5.1cm Absolute error=Measured Value-Actual Value Absolute error=5.1cm-5cm=>0.1cm

3 - Question

What is the relative error of an observation taken by an ultrasonic sensor which predicts the distance of an object to be 3.1 cm but the actual value is 3 cm?
a) 1.03
b) 0.1
c) 0.033
d) 1
Explanation: Given: Actual Value=3cm Measured Value=3.1cm Absolute error=Measured Value-Actual Value Absolute error=3.1cm-3cm => 0.1cm Relative error=Absolute error/Actual value Relative error=0.1/3=>0.033

4 - Question

What is the sensitivity of a sensor if the difference between two alternative output observations is 0.6 and difference between two alternative input observations is 0.2?
a) 3
b) 0.6
c) 0.2
d) 2
Explanation: Given: Change in output=0.6 Change in input=0.2 Sensitivity=Change in output/Change in input Sensitivity=0.6/0.2=>3

5 - Question

What is the nature of resistance to light intensity graph of aB57211P0100M301 thyristor?
a) Increasing
b) Decreasing
c) Parabolic
d) Constant
Explanation: The resistance to temperature graph of a B57211P0100M301 thermistor has a decreasing nature. When the temperature of the B57211P0100M301 increases, then the value of its resistance decreases. And vice versa happens when temperature decreases.

6 - Question

The intensity of light is inversely proportional to the resistance of a photo resistor.
a) True
b) False
Explanation: The intensity of light is inversely proportional to the resistance of a photo resistor. When the intensity of light falling on the photo resistor increases its resistance decreases. The resistance to light intensity graph of a photo resistor has a decreasing nature.

7 - Question

Transformer is a type of transducer.
a) True
b) False
Explanation: Transformer is not a type of transducer. Transducers are devices that can convert one form of energy to some different form, whereas a transformer steps up or steps down voltage or current. It does not changes the form of energy

8 - Question

The resistance of a thermistor is directly proportional to its temperature.
a) True
b) False
Explanation: The resistance of a thermistor is inversely proportional to its temperature. When the temperature of the thermistor increases, then the value of its resistance decreases. And vice versa happens when temperature decreases.

9 - Question

What is the sensitivity of a sensor if the difference between two alternative output observations is 0.4 and difference between two alternative input observations is 0.2?
a) 0.4
b) 0.6
c) 0.2
d) 2
Explanation: Given: Change in output=0.4 Change in input=0.2 Sensitivity=Change in output/Change in input Sensitivity=0.4/0.2=>2

10 - Question

What is the relative error of an observation taken by an infrared sensor which predicts the distance of an object to be 4cm but the actual value is 3.8cm?
a) 1.03
b) 0.0526
c) 0.033
d) 1
Explanation: Given: Actual Value=3.8cm Measured Value=4cm Absolute error=Measured Value-Actual Value Absolute error=4cm-3.8cm=>0.2cm Relative error=Absolute error/Actual value Relative error=0.2/3.8cm=>0.0526

11 - Question

All sensors are transducers.
a) True
b) False
Explanation: All sensors are transducers. Transducers are devices that can convert one form of energy to some different form; when a sensor senses an object it converts it into machine readable electrical signals therefore it’s a transducer. But all transducers are not sensors.

12 - Question

What is the nature of resistance to temperature graph of a thermistor?
a) Increasing
b) Decreasing
c) Increases and then decreases
d) Constant
Explanation: The resistance to temperature graph of a thermistor has a decreasing nature. When the temperature of the Thermistor increases, then the value of its resistance decreases. And vice versa happens when temperature decreases.

13 - Question

What is the relative error of an observation taken by an ultrasonic sensor which predicts the distance of an object to be 2.3 cm but the actual value is 2.1cm?
a) 1.03
b) 0.2
c) 0.0869
d) 1
Explanation: Given: Actual Value=2.3cm Measured Value=2.1cm Absolute error=Measured Value-Actual Value Absolute error=2.3cm-2.1cm=>0.2cm Relative error=Absolute error/Actual value Relative error=0.2/2.3=>0.0869

14 - Question

What is the absolute error of an observation taken by an Infrared sensor which predicts the distance of an object to be 3.2 cm but the actual value is 2.9cm?
a) 1.1
b) 0.3
c) 0.03
d) 1
Explanation: Given: Actual Value=2.9 cm Measured Value=3.2cm Absolute error=Measured Value-Actual Value Absolute error=3.2cm-2.9cm=>0.3cm

15 - Question

What is the nature of resistance to light intensity graph of a Photo resistor?
a) Increasing
b) Decreasing
c) Parabolic
d) Constant