1. Fidelity is a static characteristic.
a) True
b) False
Explanation: Fidelity is not a static characteristic. It is a dynamic characteristic of an instrument. Fidelity refers to the degree of exactness of a measured value with a measured quantity that has been measured without dynamic errors.
2. Measuring lag is a dynamic characteristic.
a) True
b) False
Explanation: Measuring lag is a dynamic characteristic. Sensors, transducers or any instrument do not respond immediately to the change in input. Measuring lag refers delay in response of an instrument to the change in input.
3. In time delay type measuring lag the instrument responds immediately as soon as the input is altered.
a) True
b) False
Explanation: In time delay type measuring lag the instrument does not responds immediately as soon as the input is altered. In this type of time delay type measuring lag the instrument responds after an unspecified dead time lag.
4. Which instrument can be used to measure time without any errors?
a) Analog Clock
b) Digital Clock
c) Atomic clock
d) Doomsday clock
Explanation: Atomic clock is an instrument can be used to measure time without any static errors. These are the most accurate instrument that can accurately measure time and frequency and are used as standard for different purpose such as for global navigation satellite systems.
5. Which method can reduce dynamic error?
a) By increasing accuracy
b) By increasing precession
c) By reducing sensitivity
d) By reducing time lag
Explanation: Dynamic errorcan be reduced by reducing time lag. Accuracy, precession and sensitivity are static characteristics. Dynamic errors are caused when the instruments do not respond immediately therefore reducing time lag will reduce dynamic error.
6. Which among the following is not a dynamic characteristic?
a) Precession
b) Measuring lag
c) Dynamic error
d) Fidelity
Explanation: Precession is not a dynamic characteristic. It comes under static characteristic. Dynamic characteristics of any sensor or transducer are determined by observing criteria’s that vary rapidly with time. Precession is the closeness of a single observation among the predefined sets of observations.
7. Which among the following is not a dynamic characteristic?
a) Response speed
b) Accuracy
c) Retardation type measuring lag
d) Time delay lag
Explanation: Accuracy is not a dynamic characteristic. It comes under static characteristic. Static characteristics are related to steady state response. Accuracy is the observation closest to the true value.
8. Which method can reduce dynamic error?
a) By increasing stability
b) By increasing tolerance
c) By increasing resolution
d) By increasing speed of response
Explanation: Dynamic error can be reduced by increasing speed of response. Stability, tolerance and resolution are static characteristics. Dynamic errors are caused when the instruments do not respond immediately therefore increasing speed of response will reduce dynamic error.
9. Which among the following transducer is an example of passive transducer?
a) Photovoltaic cell
b) Thermocouple
c) Piezoelectric transducer
d) Thermistor
Explanation: Thermistor is an example of passive transducer. Passive transducers are those types of transducers that bring change in passive electrical quantity usually with the help of external power source. Thermistor is a device that changes its resistance when there is change in temperature.
10. Which among the following transducer is an example of active transducer?
a) LDR (Light dependant sensor)
b) Thermocouple
c) LVDT (linear variable differential transformer)
d) Thermistor
Explanation: Thermocouple is an example of active transducer. Active transducers are those types of transducers that convert one form of energy to another without any external power source. Thermocouple consists of two rods made of different metal welded at a junction. When it senses a temperature difference it generates a voltage.