Sensors and Instrumentation Pre-requisite

What is Ohm's Law and how is it expressed mathematically?

• R = V - I

• V = R / I

• Ohm's Law is expressed mathematically as V = I * R.

• I = V + R

Calculate the power consumed by a device that operates at 5 Amperes and 120 Volts.

• 600 watts

• 500 watts

• 720 watts

• 1000 watts

What are the three main types of electrical sensors?

• Thermal sensors

• Resistive sensors, Capacitive sensors, Inductive sensors

• Optical sensors

• Magnetic sensors

Name a common instrument used to measure atmospheric pressure.

• Thermometer

• Hygrometer

• Anemometer

• Barometer

How does a thermocouple work as a temperature sensor?

• A thermocouple measures temperature by using a liquid-filled bulb.

• A thermocouple works by generating a voltage based on the temperature difference between its junction and the other ends of the wires, allowing for temperature measurement.

• A thermocouple detects temperature through infrared radiation.

• A thermocouple operates by changing its physical shape with temperature.

What is the formula for calculating electrical power in a circuit?

• P = V + I

• P = V × I

• P = I² × R

• P = V² / R

Identify a device used to measure humidity in the atmosphere.

• Thermometer

• Barometer

• Anemometer

• Hygrometer

What is the purpose of an anemometer in meteorology?

• To measure wind speed and direction in meteorology.

• To predict weather patterns over long periods.

• To measure temperature changes in the atmosphere.

• To analyze humidity levels in the air.

Explain the difference between active and passive sensors.

• Passive sensors emit energy; active sensors detect natural energy.

• Active sensors emit energy; passive sensors detect natural energy.

• Active sensors are used for weather forecasting; passive sensors are used for photography.

• Active sensors only work at night; passive sensors work during the day.

What instrument would you use to measure wind speed?

• barometer

• thermometer

• anemometer

• hygrometer