Electrical Measurements and Instrumentation MCQs (Part-14)
Which device is used to measure the flow of liquids or gases in a pipe?
A Thermometer
B Strain gauge
C Flow meter
D Pressure sensor
A flow meter is used to measure the rate of flow of liquids or gases through pipes. It converts the mechanical movement caused by the flowing substance into an electrical signal that can be measured and analyzed.
What principle does a magnetic flow meter work on?
A Faraday’s law of induction
B Kirchhoff’s law
C Coulomb’s law
D Ohm’s law
A magnetic flow meter works on Faraday’s law of induction, where a conductor moving through a magnetic field induces a voltage. In this case, the liquid flowing through a magnetic field generates a voltage that is proportional to the flow rate.
What is the primary use of a displacement sensor?
A Measure temperature
B Measure speed
C Measure position
D Measure force
A displacement sensor is used to measure the position or displacement of an object in relation to a reference point. It is widely used in automation, robotics, and industrial applications to monitor and control movements.
Which type of sensor is commonly used to measure the speed of rotating objects?
A Speedometer
B Tachometer
C Accelerometer
D Strain gauge
A tachometer is used to measure the rotational speed of an object, usually in revolutions per minute (RPM). It is commonly used in motors, turbines, and various rotating machinery for performance monitoring and control.
What is the primary function of a velocity sensor?
A Measure speed
B Measure force
C Measure displacement
D Measure pressure
A velocity sensor measures the speed of an object in motion. These sensors are widely used in automotive, industrial, and research applications to monitor and control the speed of rotating or moving parts.
What is a common application of a flow meter?
A Temperature control
B Energy conservation
C Fluid flow measurement
D Electrical resistance
Flow meters are essential for measuring the rate of flow in pipes or channels, often used in industries dealing with water, oil, gases, and chemicals. Accurate flow measurement ensures process efficiency, safety, and regulatory compliance.
What type of sensor is used to detect angular displacement?
A Tachometer
B Rotary encoder
C Strain gauge
D Pressure sensor
A rotary encoder is used to measure the angular position or rotational displacement of an object. It converts mechanical rotation into an electrical signal, commonly used in robotics, automation, and control systems.
How do optical flow meters measure flow?
A Using temperature variation
B Using pressure sensors
C Using vibration
D Using light reflection
Optical flow meters use light reflection from particles suspended in a moving fluid. The change in light intensity or reflection due to the flow of the fluid is detected and correlated with the flow rate.
Which type of sensor is typically used in automotive speedometers?
A Tachometer
B Displacement sensor
C Speedometer
D Strain gauge
A speedometer is used in automobiles to measure the speed of the vehicle. It works by measuring the rotational speed of the wheels or driveshaft and converting that into the vehicle’s speed, typically displayed in miles or kilometers per hour.
What kind of measurement does a capacitance based displacement sensor provide?
A Linear displacement
B Pressure
C Temperature
D Velocity
A capacitance based displacement sensor measures the linear displacement of an object. It works by detecting changes in the capacitance between two plates as the object moves. This type of sensor is highly sensitive and used for precise measurements in various applications.
What is typically measured by a pitot tube?
A Fluid pressure
B Flow rate
C Temperature
D Flow velocity
A pitot tube measures the velocity of fluid flow by converting the kinetic energy of the fluid into potential energy. It is widely used in aviation to measure the speed of an aircraft relative to the air.
How does a speed sensor detect speed?
A By measuring current
B By detecting frequency changes
C By measuring voltage drop
D By detecting temperature changes
A speed sensor detects the speed of an object by monitoring changes in the frequency of signals generated by the motion of the object. These signals are then processed to determine the speed, often used in automotive and industrial applications.
Which type of flow meter is suitable for measuring the flow of viscous liquids?
A Magnetic flow meter
B Rotameter
C Coriolis flow meter
D Ultrasonic flow meter
A Coriolis flow meter is particularly effective for measuring the flow of viscous liquids. It works by detecting the changes in the vibration of a tube caused by the mass flow of the fluid. These meters are highly accurate and used for precise flow measurements.
What does a Doppler flow meter measure?
A Fluid temperature
B Fluid pressure
C Fluid density
D Fluid velocity
A Doppler flow meter measures the velocity of a fluid by using the Doppler effect. It analyzes the shift in frequency of sound waves reflected off particles in the fluid, providing a measurement of the flow velocity.
What principle does a turbine flow meter operate on?
A Coriolis effect
B Mechanical rotation
C Magnetic induction
D Thermal conductivity
A turbine flow meter operates on the principle of mechanical rotation. The fluid flow causes a turbine wheel to spin, and the rotational speed is proportional to the flow rate. It is often used for measuring high flow rates in pipelines.