What does LVDT stand for?
A
Linear Voltage Display Transformer
B
Linear Variable Displacement Transducer
C
Linear Variable Differential Transformer
D
Load Voltage Differential Transducer
Analysis & Theory
LVDT stands for Linear Variable Differential Transformer, a type of electromechanical transducer.
Which physical quantity does an LVDT measure?
Analysis & Theory
LVDTs are primarily used to measure linear displacement accurately.
What is the output of an LVDT?
Analysis & Theory
LVDT outputs an AC voltage proportional to the displacement of the core.
Which of the following is NOT a part of an LVDT?
Analysis & Theory
Strain gauge is used in other transducers, not in LVDT construction.
What happens when the LVDT core is at the null position?
A
Maximum voltage is induced
B
Both secondary voltages are equal and opposite
C
No magnetic field is produced
D
Primary coil is deactivated
Analysis & Theory
At null position, the output voltage is zero due to equal and opposite secondary voltages.
In a potentiometer-based displacement sensor, what changes with displacement?
Analysis & Theory
As the slider moves, the resistance changes, which varies the voltage across it.
A potentiometer works on which principle?
Analysis & Theory
It works on the principle of change in resistance due to linear motion of a contact.
Which of the following is an advantage of LVDT over potentiometers?
Analysis & Theory
LVDT has no physical contact between core and coil, so it operates without friction.
Which displacement transducer is suitable for harsh environments?
Analysis & Theory
LVDTs are robust, sealed, and operate reliably in extreme or dirty environments.
What is the typical output of an LVDT at full range displacement?
D
A few millivolts to several volts AC
Analysis & Theory
LVDTs generally produce a small AC voltage in the range of millivolts to a few volts.