15 Questions
What is the basic structure of a DC bridge and what is its purpose?
The basic DC bridges consist of four resistive arms with a source of emf (a battery) and a null detector usually galvanometer or other sensitive current meter. They are generally used for the measurement of resistance values.
What are the types of DC bridges and what are their uses?
The types of DC Bridges are a) Wheatstone Bridge, which is used for measuring medium resistance values in the range of 1Ω to below megaohm, and b) Kelvin bridge.
Explain how the Wheatstone Bridge works and what condition indicates balance in the bridge?
The Wheatstone Bridge works by having the current through the galvanometer depend on potential difference between point (c) and (d). The bridge is said to be balance when potential difference across the galvanometer is zero volts, so there is no current through the galvanometer ($I_g = 0$).
What is the purpose of a null detector in a DC bridge?
The null detector in a DC bridge is used to indicate when the bridge is balanced, i.e., when the potential difference across the galvanometer is zero volts, so there is no current through the galvanometer ($I_g = 0$).
What are the CLOs covered in the course related to DC and AC bridges operation and their application?
The CLOs covered in the course related to DC and AC bridges operation and their application are: Calculate signal conditioning parameters in the instrumentation system and Design of signal condition circuit.
What is the principle of operation for Resistance Temperature Detectors (RTD)?
The output resistance changes with temperature, and it is a positive temperature coefficient device.
What factor is the most important for Resistance Temperature Devices (RTD)?
Temperature coefficient α
Which type of device are Resistive Temperature Detectors (RTD)?
Positive temperature coefficient device
What property of the metal in RTD is responsible for its operation?
Resistivity
What does an RTD capitalize on to measure temperature?
Changes in electrical resistance with temperature
What is the temperature coefficient for Resistance Temperature Devices (RTD)?
It can be positive or negative depending on the material used
What property of the metal in RTD is responsible for its operation?
Resistivity
What type of temperature coefficient does a Resistive Temperature Detector (RTD) have?
Positive temperature coefficient
What does an RTD capitalize on to measure temperature?
Change in electrical resistance with temperature
What is the most important factor for Resistance Temperature Devices (RTD)?
$\alpha$, the temperature coefficient
Test your knowledge of DC and AC bridges operation and their application in instrumentation and measurement. This quiz covers topics related to signal conditioning parameters in the instrumentation system.
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