Instrumentation Transducers

Magnetostrictive Transducers

Question 1
Marks : +2 | -2
Pass Ratio : 5%
Which of the following represents correct expression for sensitivity in a magnetostrictive transducer?
ΔB
ΔB/σ
σ
σ/ΔB
Explanation:
Sensitivity of a magnetostrictive transducer is the ratio of change in magnetic flux density and applied stress.
Question 2
Marks : +2 | -2
Pass Ratio : 5%
Which of the following represents correct conversion for magnetostrictive transducers?
Mechanical energy to magnetic energy
Mechanical energy to electrical energy
Magnetic energy to electrical energy
Mechanical energy to acoustic energy
Explanation:
Transducers which convert mechanical energy to magnetic energy is known as magnetostrictive transducers.
Question 3
Marks : +2 | -2
Pass Ratio : 11%
Which of the following represents the use of including additional mass in acceleration transducer?
To prevent system response to transverse acceleration
To prevent system response to linear acceleration
To prevent system response to angular acceleration
None of the mentioned
Explanation:
Additional mass is included in the magnetostrictive acceleration transducers for avoiding effects of transverse acceleration.
Question 4
Marks : +2 | -2
Pass Ratio : 11%
Which of the following materials shows an increase in permeability with increase in tensile stress?
Negative magnetostriction materials
Non magnetostriction materials
Positive magnetostriction materials
None of the mentioned
Explanation:
Positive magnetostriction materials are those which exhibits direct proportionality between permeability and applied stress.
Question 5
Marks : +2 | -2
Pass Ratio : 26%
Which of the following element shows increase in magnetic flux density on decreasing stress applied?
Nickel Iron alloy
Nickel
Both Nickel and Nickel iron alloy
None of the mentioned
Explanation:
Nickel in its pure form shows inverse proportionality between stress and magnetic flux density, while Nickel Iron alloy shows direct proportionality between stress and magnetic flux density.
Question 6
Marks : +2 | -2
Pass Ratio : 5%
Which of the following torque can be measured using magnetostrictive transducers?
Large amplitude torque
Small amplitude torque
Torque of an amplitude
Cannot be used to measure torque
Explanation:
Magnetostrictive torque transducers are suitable for measuring time varying small amplitude torques only.
Question 7
Marks : +2 | -2
Pass Ratio : 5%
Magnetostrictive transducer can be used to measure _______________
Force
Acceleration
Torque
All of the mentioned
Explanation:
Magnetostrictive transducers can be used to measure a wide variety of quantities like force, acceleration, torque etc.
Question 8
Marks : +2 | -2
Pass Ratio : 26%
Which of the following represents negative magnetostriction?
On increasing stress permeability decreases
On decreasing stress permeability decreases
On increasing stress conductivity decreases
None of the mentioned
Explanation:
In negative magnetostrictive materials as the stress applied is increased, magnetic properties like remnant magnetic field and permeability increases.
Question 9
Marks : +2 | -2
Pass Ratio : 16%
Magnetostrictive transducers can only be used in static forces.
True
False
Explanation:
Magnetostrictive force transducers can be used in case both static and dynamic forces.
Question 10
Marks : +2 | -2
Pass Ratio : 16%
Magnetostrictive transducers are more sensitive than piezoelectric transducers.
True
False
Explanation:
Due to the action of earth magnetic field magnetostrictive transducers became less sensitive than piezoelectric transducer.