LVDT and Balanced Demodulator Quiz

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What is the range of the LVDT mentioned in the text?

0 to +15mm (correct)

+/- 10mm

+/- 15mm

0 to +10mm

What is the purpose of the balanced demodulator?

To compare the output signals with the excitation signal and produce a phase-sensitive DC output (correct)

To scale the DC output voltages to the required levels

To display the final output voltage on a digital voltmeter

To amplify the output signals from the LVDT

Which component is used for scaling the DC voltages obtained from the balanced demodulator?

The digital voltmeter

The LVDT

An op-amp (correct)

The balanced demodulator itself

What is the full-scale reading of the digital voltmeter used for displaying the output?

+/- 1.999 volts Signup and view all the answers

What is the resolution of the output voltage display?

0.01 mm Signup and view all the answers

What is the purpose of the audio frequency oscillator mentioned in the text?

To provide the excitation signal for the LVDT Signup and view all the answers

In which position of the core does the LVDT produce the maximum output voltage magnitude?

When the core is towards coil S2, side where x = Ax Signup and view all the answers

What determines the polarity of the output voltage in an LVDT?

The position of the core relative to the coils Signup and view all the answers

In which position of the core does the LVDT produce an output voltage with opposite polarity to the excitation signal?

When the core is towards coil S2, side where x = Ax Signup and view all the answers

What is the purpose of having two identical secondary coils in an LVDT?

To cancel out any unwanted voltages due to phase cancellation Signup and view all the answers

What is the term used for the output voltage when the core is at the center position (x = 0)?

Residual voltage Signup and view all the answers

How does the displacement of the core affect the output voltage in an LVDT?

The displacement affects both the magnitude and polarity of the output voltage Signup and view all the answers

What is the purpose of the LVDT device described in the text?

To measure linear displacement Signup and view all the answers

What happens to the output voltage on the secondary coils S1 and S2 when the core is centered within the primary coil?

The output voltage is equal to zero Signup and view all the answers

How does the output voltage on the secondary coils S1 and S2 change as the core moves away from the central position?

The output voltage increases on one secondary and decreases on the other Signup and view all the answers

What is the relationship between the output voltage on the secondary coils S1 and S2 and the direction of the core movement?

The output voltage on S1 and S2 changes polarity depending on the direction of core movement Signup and view all the answers

What is the purpose of the open cage construction of the LVDT device?

To provide symmetrical placement of the secondary coils Signup and view all the answers

What is the purpose of the sinusoidal excitation source connected to the primary coil?

To create a magnetic field that interacts with the movable core Signup and view all the answers

LVDT and Balanced Demodulator Quiz

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